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1[[quoteright:300:[[Manga/OuranHighSchoolHostClub https://static.tvtropes.org/pmwiki/pub/images/HikaruandKaoru.png]]]]
2[[caption-width-right:300:[[BlatantLies It's just brotherly love.]]]]
3
4->''"Jaime and I are more than brother and sister. We shared a womb, came in to this world together. We '''belong''' together."''
5-->-- '''Cersei Lannister''', ''Series/GameOfThrones'', [[Recap/GameOfThronesS1E7YouWinOrYouDie "You Win or You Die"]]
6
7Popular culture often expects twins to share everything, including, it seems, their beds. It's a particularly common trope in SlashFic and RuleThirtyFour, though it does occur in mainstream fiction often enough to be a discernible trope.
8
9It's especially common as a way of making CreepyTwins just that much more disturbing, often as a form of VillainousIncest. For {{Yuri Fan}}s and {{Yaoi Fan|girls}}s who became fans at least partly because they see a [[ForbiddenFruit forbidden appeal]] to such relationships, twincest supercharges that part of the appeal. Though twincest is not necessarily homosexual -- heterosexual {{Half Identical Twins}} tend to have the highest rate of twincest.
10
11A common twist in Twincest -- and in BrotherSisterIncest in general -- is SurpriseIncest: for a couple to fall in love, only to find out later that they're related. The fact that SeparatedAtBirth is already a common twin trope reinforces this. How far their relationship goes before they discover this generally depends on whether the plotline is supposed to be humorous or tragic.
12
13In other variations, the twins know perfectly well that they're related, and might like each other all the more for it--if you believe in OneTrueLove, soulmates being born together does make a certain kind of sense. MindlinkMates and TwinTelepathy definitely have parallels. Ultimately, although this is fairly exploitational, such a rationale is the simplest and most common in modern works where twins enter into romantic or sexual relations deliberately and voluntarily. Commonly, the ''twins in question'' believe they're soulmates, but ''everyone else'' has a NoJustNoReaction.
14
15An old Japanese myth says that if two star-crossed lovers commit dual suicide, they get reincarnated as twins. This may be one of the factors in the frequency of Twincest stories in {{anime}}. In this case, RedStringOfFate and, as a whole, esoteric-religious motives such ReincarnationRomance can be used as a justification for obviously taboo relations.
16
17In a broader religious or mythological context, this trope can be regarded as OlderThanDirt, given the many similar myths in different nations where twincest is directly mentioned or implied in the context of couples from HalfIdenticalTwin DivineIncest gods who are portrayed as appointed to become husband and wife, or as the first people in general.
18
19Twincest is '''not''' the same as TwinThreesomeFantasy. Twincest is all about twins screwing ''each other''; in a TwinThreesomeFantasy, the focus is either on the third, non-twin party, or on each other but ''for the benefit'' of the third party.
20
21A subtrope of BrotherSisterIncest. If it's just implied, then it overlaps with IncestSubtext. It's also important not to make mistakes with other BrotherSisterIncest couples, since, due to the popularity of this trope and [[TwinsAreSpecial the idea of a spiritual bond of twins]], many "ordinary" couples between brother and sister can imitate many twincest cliché elements.
22
23Twincest is often associated with ScrewYourself (when a character has sex with an alternate version of themself). The two don't have any clear link, yet the association suggests that some people view [[InsaneTrollLogic twins as alternate versions of the same person]].
24
25%% DO NOT add examples that really belong under TwinThreesomeFantasy -- list them on that page.
26
27----
28!!Examples:
29
30[[foldercontrol]]
31
32[[folder:Anime & Manga]]
33* ''VisualNovel/YosugaNoSora'' is practically TropeCodifier of this trope for HGame and especially anime, gradually and in detail depicting the development of romantic feelings between HalfIdenticalTwins Sora and Haruka Kasugano and their different approaches in the awareness and acceptance of their feelings for each other.
34* ''Aki Sora'' mainly chronicles the secret romance of the titular sister-brother duo, but said brother also has a mentally unstable twin sister who rapes and sexually abuses him.
35* ''Manga/AngelSanctuary'': Let's not get started on Rociel[=/=]Roshiel's "ambiguous" attitude towards his twin sister Alexiel. But then again, Rociel isn't a paragon of sanity, and brother-sister incest is one of the main ''themes'' of the manga.
36* ''Manga/BlackLagoon'''s Hansel and Gretel. [[CreepyTwins Given]] [[AxCrazy their]] [[FreudianExcuse history]], this is possibly the ''least'' disturbing thing about them.
37* ''Bloods: Inraku no Ketsuzoku 2'': The Sagemiya family is cursed in that its members are sexually aroused in the presence of another of the same bloodline. Misaki's twin brother Shun is both disgusted over this and has sworn to resist the curse. However, Shun loses his composure and starts banging their big sister Kagu. After Misaki finds out, she too gives in to the curse and begins an affair with Shun.
38* The Hayasaka twins from ''Manga/BusoRenkin'', while probably not involved in ''actual'' twincest, do act a lot like a married couple, and as kids, used to recite the traditional wedding vows to each other as a game. [[spoiler:This was done by their kidnapper, a woman who has had an affair with their biological father that was later broken off. After being spending nearly three years with the woman, they suffered a ParentalAbandonment with the "marriage game" being their only happy memory giving them a "us vs the world" codependent mentality similar to the Hitachiin twins]]. Meeting Kazuki Muto helped them become individuals but are still close.
39* ''Anime/CandyBoy'' is entirely about ''[[YuriGenre yuri]]'' twincest, in that Yukino does like to tease her sister Kanade quite a bit. There's nothing explicit going on since Kanade decides to keep a cool outer appearance, although she is obviously enamored with her sister. [[spoiler:Something explicit ''is'' going on by the end. They kiss in the last non-DVD episode.]] The manga also revolves around their romantic, and sometimes sexual, feelings for each other.
40* ''Manga/CaseClosed'':
41** This makes up all the drama in one case. Raita Banba, a high school friend of Kogoro's, had a fiancée named Hatsune Kamon. On the eve of their wedding, Hatsune was killed when the car exploded, and Raita was the main suspect due to his CrazyJealousGuy tendencies. It was later revealed that [[spoiler:they were HalfIdenticalTwins, who were separated when they were babies after a house fire, and the two didn't ''know'' that they committed twincest until Hatsune received a call that the DNA results confirms that. Already ''very'' stressed from the thought of Raita's and her origins ''and'' the fact that she was sick, poor Hatsune soon fell into the DespairEventHorizon and as a result, she committed suicide. The sickness part is important because Hatsune suffered from Turner syndrome which is what happens when one of the sex chromosomes, either the second X or the Y, is missing or structurally altered. Hatsune is in fact Raita's ''identical twin'' and would have probably been born male.]]
42* In ''Manga/CastleTownDandelion'', one of Misaki's [[LiteralSplitPersonality clones]] (Shaura) embodying her [[LovableSexManiac repressed lust]] shows strong affection towards her twin brother Haruka, while teasing Misaki that this is what she truly wants; though she denies this, Shaura also states that the reason for Misaki partaking in her country's {{electi|veMonarchy}}on are all to gain Haruka's attention, all away from her other sisters.
43* ''Manga/CeresCelestialLegend'' plays this trope quite creepily and mixes it with RapeAsDrama. The actual twins, Aya and Aki, care for each other deeply but don't have twincestuous feelings for each other; they are, however, possessed by their ancestors, Shisou and Ceres, who were husband and wife.
44* ''Manga/{{Chobits}}'' has some ''extremely'' un-sibling-like touching between Chi and the "Dark Chi" that appears in her mind. [[spoiler:This proves to be her sister, Freya, whose mind was downloaded into Chi.]]
45* ''Manga/ACruelGodReigns'': Eric and Valentine. Eric became dangerously dependent on his twin sister after [[spoiler:being molested by their piano teacher as a child]]. Unable to separate comfort from romance, the two [[spoiler:had sex [[TeenPregnancy and Valentine had a baby]] at 13 years old]].
46* Mukuro in ''Anime/Danganronpa3TheEndOfHopesPeakHighSchool'' shares an incestuous MasochismTango with her twin sister [[BigBad Junko]], as she had her sisterly affection twisted into unquestioning devotion due to [[ManipulativeBastard Junko's manipulation]]. As a result, all she can do is blush and moan with pleasure as Junko beats and insults her.
47* The ''Manga/DestinyOfTheShrineMaiden'' manga ends with [[spoiler:Chikane and Himeko reincarnated as twin sisters]]. This may be a variation on the Japanese myth mentioned above.
48* ''Anime/DigimonFrontier'': While the newly-reunited twins Kouji and Kouichi are distinctly ''not'' an example, it does get used as a joke in episode 41. Kouji saving his brother from [[TheFightingNarcissist Crusadermon]] ends in an [[http://www.digimonspirit.net/gallery/albums/userpics/10001/normal_beanstalk0078.jpg awkwardly dramatic moment]] (possibly enhanced by in-universe ShippingGoggles), which leads the beauty-obsessed Crusadermon to declare, "Ah, brotherly love is ''grand!''" [[http://www.digimonspirit.net/gallery/albums/userpics/10001/normal_beanstalk0080.jpg The other observing Legendary Warriors are notably disturbed.]]
49* ''Manga/DNAngel'' features some LesYay between twins Risa and Riku, though mostly in color illustrations. There's a rather eyebrow-raisingly sensual pic of them lying side-by-side on a bed. One shall also note that they get a pinky thread of love together.
50* ''Manga/DotHackLegendOfTheTwilight'' hints strongly at incest, or at least lust, between twins Shugo and Rena. This is basically a {{Flanderization}} of subtler jokes in the manga, where it was the sister's completely different-looking and skimpily-dressed computer avatar that set off the whole thing. The anime altered the storyline near the end where their relationship is implied to be much stronger.
51* ''Literature/{{Durarara}}'''s Mairu and Kururi [[spoiler:Orihara]] have somewhat incestuous feelings towards one another, largely owing to the fact that they're not quite right in the head ([[SingleMindedTwins they don't actually consider themselves separate individuals]], for starters).
52* Though barely present in the main story of ''Manga/{{Earthian}}'', other than a mention now and again by his assistant and [[HoYay close friend Raphael]], Lord Michael and his twin sister Lucifel are featured prominently in an extra story, written years following the original publishing, that was included in the reprint. In the story, not only is Lucifel shown to be extra touchy-feely with Michael (not to mention possessive of him, to the point where Raphael considers her his romantic rival), it is strongly implied that [[spoiler:not only do they eventually have sex, but Lucifel has a child by him, that child being Kagetsuya, one of the two main characters of the main story.]] This becomes somewhat less of a shock when you consider the mangaka is Yun Kouga (see ''Manga/{{Loveless}}'').
53* In ''Literature/FullMetalPanic: The Second Raid'', the assassins Xia Yu Fan and Xia Yu Lan are twin sisters who take showers together and hold each other at every available opportunity. [[spoiler:Also, Yu Lan sees Yu Fan descending naked from the sky toward her when she dies.]]
54* ''Anime/MobileSuitGundam00'' plays with this too. Whether [[DarkMessiah Ribbons Almark]] and his "sister" [[DarkActionGirl Healing Care]] qualify as twins is debatable, [[spoiler:both of them being DNA-engineered children with the same sequence]], but Healing seems to show a bit more adoration than is platonic towards Ribbons.
55* The relationship between Carossa and Melissa in ''Anime/GunXSword'' has elements of this, though they are never so pronounced as when the two first appear and Carossa ''licks away Melissa's tears''. Van, watching, cannot help but be a little disturbed. They ''are'' basically kids. What ''was'' there was creepy, particularly Carossa managing to imply "Abusive Relationship" while being all of twelve years old.
56* In ''Manga/MagicalGirlSite'', Aya and Yatsumura fall for each other, but Aya later learns they are SeparatedAtBirth twin sisters. In the ending, they pursue the relationship anyway.
57* Subverted in ''Anime/MobileSuitGundamSEED'': Kira and his SeparatedAtBirth twin sister Cagalli meet in the first episode, neither knowing they're related. When they reunite further in the series, Cagalli comforts the emotionally ragged Kira. Cagalli also seems to develop a crush on Kira. This is taken as a threat by Flay, Kira's screwed-up girlfriend ([[MindGameShip it's not a healthy relationship]]). Further toyed with when Cagalli displays a LuminescentBlush at overhearing Flay admit to her ex-fiance Sai that she and Kira have slept together, and when Kira's adoptive parents Caridad and Haruma (who are aware of Cagalli's identity, [[spoiler:as the mother rescued both twins as babies from the place where their biological parents died]]) show a bit of alarm when Cagalli hugs Kira goodbye. They're informed of their true relationship before things have a chance to go any further.
58* In ''Manga/{{Monster}}'', there is a one-sided example with Johan Liebert and his twin, Anna. Unfortunately, Johan is also [[MagnificentBastard really]] [[TheAntichrist scary]] and effectively scares Anna half to death whenever she thinks about him. Although, considering how he treats other people, this may be the only way he's even capable of displaying affection whatsoever. It doesn't seem to be brotherly love, though, when he talks about her as his "other half," and the poetic, romantic emails he anonymously sends at the start of the story are taken to be from a secret admirer. It comes off as a really creepy infatuation, usually.
59* ''Anime/MyselfYourself'' has twins Shuri and Shusuke with a particularly strong relationship in the face of ParentalAbandonment, with a later rumor even claiming a more illicit relationship. [[spoiler:Under threat of separation, they run away together near the end]]. The DistantFinale goes on, giving them a strange MaybeEverAfter the end, where they attend a concert of main characters, holding hands. The original game at the same time plays with it, [[spoiler: giving both twins the other LoveInterest, but at the same time having a scene with Shusuke in the route of his sister, where he confesses to one-sided feelings towards her.]] Nevertheless, despite all the ambiguity, it's still {{Fanon}} among fans.
60* The first episode of ''Anime/OsomatsuSan'' parodies this. The characters try to re-imagine ''Manga/OsomatsuKun'' for a modern-day audience as an [[IdolSinger idol]], harem show with a CastFullOfPrettyBoys. This includes IncestSubtext between the brothers (mind you they're ''sextuplets'').
61* ''Manga/OshiNoKo'': [[spoiler:Ruby starts to develop feelings for Aqua after finding out that he's actually her reincarnated "sensei". Considering the fact that she made a promise to Goro back when she was Sarina, her current behaviour towards him does make sense.]]
62* ''Manga/OuranHighSchoolHostClub'': This is the main "schtick" of GenreSavvy Hikaru and Kaoru(pictured above): making the club's female clients swoon and sigh over "the forbidden love between brothers!!!" Whether it's a put-on or not is hard to tell, given their trickster personalities. They seem to be ''very'' affectionate toward each other even when the fangirls ''aren't'' watching--but this, too, could also be a game they play. Nevertheless, on one occasion where Tamaki calls them early on a weekend, [[spoiler:we see them waking up in bed… the same bed… cuddling each other. ''Naked.'']] It's also deconstructed, as the twins are revealed to be dangerously codependent. In the manga, this eventually sparks a feud between them, and they eventually learn how to be individuals.
63* Teased with The Demon Sisters in ''Anime/PantyAndStockingWithGarterbelt'', who are a little ''too'' nice to one another. [[spoiler:They briefly engage in twincest in the second to last episode.]]
64* [[spoiler:Masako and Kanba]] from ''Anime/{{Penguindrum}}'', sort of: [[spoiler:Masako openly chases after Kanba, but though he cares for her, he doesn't reciprocate.]]
65* ''Anime/PleaseTwins'' features a boy who is not sure which of the two girls in the story is his long-lost twin sister. Both girls show up to his house with the exact same photo, and the image is of a young boy and girl too young to discern which of the two grown women it is. The guy has the same photo, so it's a safe bet that he's the boy in the image, but all three begin living in the same home in hopes to find out. They ''both'' fall for him, making one a case of twincest and the other not, and the story uses this fact as all parties are clearly uncomfortable with being in a relationship with a sibling to the point that each girl begins hoping they aren't related to him so that these feelings can be explored.
66** The manga and [[AdaptationalAlternateEnding anime]] swap which girl is the sister and which becomes the girlfriend, which muddies the canon sister dynamic. As a result, which girl is the sister and which is the girlfriend isn't only different from each medium, but this ultimately makes certain major plot points and scenes towards the end of the series differ on the medium.
67* In ''Anime/RevolutionaryGirlUtena'', HalfIdenticalTwins Miki and Kozue have a bizarre relationship which may involve twincest, particularly in the movie.
68* ''Manga/{{Saiyuki}}'': [[spoiler:Hakkai's girlfriend Kanan was actually his SeparatedAtBirth twin sister.]] It's not known when they found out, but it was [[spoiler:Hakkai's]] motive for what he did after [[spoiler:she was given up to the demons by the villagers, gang-raped, forcibly impregnated, and then DrivenToSuicide.]] And apparently even after they found out, they didn't actually break up or anything.
69* In ''Anime/SelectorInfectedWixoss'' Yuzuki is in love with her twin brother and wishes to become his girlfriend. [[spoiler:She ends up actually getting her wish granted, but at the cost of her LRIG, Hanayo, swapping places with her. Still, she doesn't hold much of a grudge against Hanayo, as she did fulfill Yuzuki's wish, and had no malicious intent when she took over her body.]]
70* ''Tayu-Tayu'': In chapter 6, Reiju accidentally overhears someone having sex inside a watermill and decides to see who it is. He's shocked to find that it's a pair of girls and even more so when he sees that it's two of his classmates: Haruka and her twin sister Sayaka. Haruka explains that their relationship started [[SituationalSexuality because most of the local boys their age moved away, leaving them with no alternatives for release besides masturbation and each other]]. Once Haruka and Sayaka started having sex, they soon found it impossible to be in the same room without tearing [[LustObject each other's]] clothes off. So they scissor each other [[ExtremeLibido every chance they get.]]
71* ''Manga/TsubasaReservoirChronicle'': The Acid Tokyo arc's Kamui and Subaru (also known as the "Vampire Twins") actually manage even more HoYay than their counterparts in ''X1999'' (where they are not related in any way). [[VampiresAreSexGods Vampirism]] (and new twincest possibilities) may have something to do with it.
72%%* Zero and his long-lost twin Ichiru in ''Manga/VampireKnight''. The 'cest is entirely irrelevant to the plot. It just needed that extra element.
73%%* In a similar Creator/{{CLAMP}} example, see Hinoto and her hallucinatory EvilTwin in ''Manga/{{X 1999}}''.
74[[/folder]]
75
76[[folder:Audio Plays]]
77* Naohiro from ''AudioPlay/YandereHeaven'' has feelings for his twin sister. Since they're the only family they have (with the exception of their stepfather), Nahiro has done his best to take care of her. His ending hints that he may have an EntitledToHaveYou behavior because they're twins and he believes that they should love each other and die together no matter what.
78* A special twist for the third volume of ''AudioPlay/YandereNoOnnaNoKo'' is [[spoiler:Alice harboring a one-sided crush on her twin sister.]] Everything she had done was to make sure that no one took her loved one away from her. Unfortunately, this led to [[spoiler:Elise killing herself because her sister refused to let her interact with anyone other else. It's suggested that Alice also kills herself to join her sister in death.]]
79[[/folder]]
80
81[[folder:Comic Books]]
82* ''ComicBook/AfterlifeWithArchie'' implies [[spoiler:Cheryl and Jason]] have incestuous affections towards each other. It's suggested not all of it is entirely consensual on [[spoiler:Cheryl's]] part.
83* In ''ComicBook/{{Grendel}}'', Orion Assante has a three-way incestuous relationship with his twin sisters, until [[DisposableWoman they get murdered to help motivate him]].
84* It was heavily implied in a few issues of ''ComicBook/InfinityInc'' that Obsidian has a crush on his long-lost twin sister Jade. She was blissfully oblivious. It should be noted that in the original ''ComicBook/InfinityInc'' comic, there's no indication of Obsidian being gay. He, in fact, has a girlfriend in later issues. It wasn't until his and Nuklon's appearances in ''ComicBook/JusticeLeague'' that his sexuality is hinted at, but not confirmed at the time. After years in limbo, it was finally made canon in JSA.
85* In ''ComicBook/{{Lazarus}}'' Jonah and Johannah Carlyle are sleeping together and plotting to [[TheUsurper usurp the family holdings from their father]]. However, when one of Jonah's badly underthought plans goes wrong, Johannah plays the WoundedGazelleGambit and pretends that Jonah betrayed her as well.
86* ''Creator/MarvelComics'': The Fenris twins (Andrea and Andreas Von Strucker) play with this idea--and likely, each other!--fairly frequently. And then it got worse gets worse. [[spoiler:Andrea has since died, and since their energy blast powers relied on them touching to function, her brother had her skin made into leather and [[DoesThisRemindYouOfAnything wrapped his sword hilt with it]]. On top of that, he is nothing short of fanatically obsessed with finding a way to resurrect her.]] The whole thing is portrayed just as creepily as it sounds, with even other characters around him being {{squick}}ed by it. Their Ultimate versions were pretty much the same, save for the bit in spoilers. However, when Andrea is later cloned, her brother tries to deny that their relationship was ever incestuous. He allows her to sleep in a separate bed, and claims that while he knows his [[ComicBook/{{Thunderbolts}} teammates]] think that he's a freak, he has no actual desire to have sex with his sister. Then due to some very complicated developments, Clone Andrea and Andreas both died. But then they were back as usual running a nightclub for supervillains, and it was unclear again.
87* Aleksandr and Aleksandra Ramanov in ''ComicBook/NikolaiDante'' are like this, even taking time out of killing the Raven Corps to make out.
88* ''ComicBook/TopTen'''s SpinOff miniseries ''ComicBook/{{Smax}}'' has [[spoiler:Smax and his sister Rexa admitting to this]], although in the world they came from it wasn't the taboo issue it was in his adopted world. [[spoiler:When she moves to Jeff's world they pose as unrelated lovers--Robyn alone knows the truth but doesn't have a problem with it.]]
89* In the ''ComicBook/UltimateMarvel'' universe, there were hints about ComicBook/{{Quicksilver}} and ComicBook/ScarletWitch going down this road from the beginning, until [[spoiler:it was confirmed outright in ''ComicBook/TheUltimates 3'', immediately before her death.]]
90* They are clones rather than twins, but the girls in the ''[[Creator/PhilFoglio XXXenophile]]'' story "Family Reunion" probably count.
91* ''ComicBook/WonderWoman2011'' gave Artemis (goddess not [[ComicBook/{{Artemis}} Amazon]]) a crush on her twin Apollo and plenty of flirting with him which he seemed to like. This was quite the shift from her normal asexuality (though not out of form for the mythological Greek gods) and was retconned to have been false versions of Artemis and Apollo with the end of the New 52 in ''ComicBook/WonderWomanRebirth''.
92* In Creator/AlanMoore's ''Lost Girls'', Alice's re-telling of [[Literature/AlicesAdventuresInWonderland her story]] casts Tweedle-Dum and Tweedle-Dee as lesbians who have sex with young girls (including Alice) as well as each other.
93[[/folder]]
94
95[[folder:Fan Works]]
96* ''Manga/SaintSeiya'':
97** The twins [[MrFanservice Gemini Saga]] and [[EvilTwin Gemini Kanon]] make one of the most popular and accepted couples among slash and yaoi fans in this series both in the manga and anime because of their dramatic and conflictive relationship as twin brothers who love and hate each other. Fandom, as we can see [[http://saintseiyayaoi.net/index.php?PHPSESSID=dac7ffcda68cb94e14996c299a5a6d73&board=72.0 here]] finds quite interesting the fact of imagining that both share more than "brotherly love" (a.k.a. twincest) during their lives despite being separated for 13 years.
98** The same happens in the spin-off ''Manga/SaintSeiyaTheLostCanvas'', with the twins [[AmbitionIsEvil Aspros]] and [[BigBrotherWorship Defteros]].
99** And the same goes with SeparatedAtBirth twins Mizar Syd and Alcor Bud from Asgard Saga.
100* [[LoveFreak Amer]][[IdiotHero ica]] and [[TheUnfavorite Canada]], the "North American Brothers" of ''Webcomic/HetaliaAxisPowers'', are (assumed to be) twins and pairing with growing popularity in the fandom. It can't match the popularity of the America/England pairing yet, but it has its devotees. Oh, and by that, we mean including having ''babies'' with each other - ''especially'' the State-tan OCs. [[BigScrewedUpFamily Oh God, the State-tan OCs.]]
101** It doesn't stop there, either. [[HairTriggerTemper Southern]] [[PerpetualFrowner Italy]] and [[TheDitz Northern]] [[NoSenseOfPersonalSpace Italy]], although not actually twins, look a lot alike, and are thus confused as twins. As a result, [[PortmanteauCoupleName Itacest]] has a pretty loyal following.
102* Quite a few fans of [[SeparatedAtBirth Kira×Cagalli]] from ''Anime/MobileSuitGundamSEED'' [[DieForOurShip refuse to follow the canon.]] Mostly because of all the ShipTease between the two before TheReveal. Also because of the [[CourtlyLove innocent purepure]] relationship between Lacus and Kira that does not seem to get any further than hugging or HoldingHands. And the relatively frustrating relationship between Everyone × Athrun × Cagalli that pushes suspension of belief.
103* From ''Literature/InfiniteStratos'' and its obscure {{Fandom}}, there's this [[Fanfic/InfiniteStratosSacredTwins (un)holy fic]]. Rather than picking one of the members of Ichika's UnwantedHarem, the author chooses Ichika's HalfIdenticalTwins... [[BigBrotherWorship who's clearly]] [[BrotherSisterIncest hots for him]]. [[spoiler:The girl in question is TheDragon, M (Orimura Madoka), chosen specifically as OCStandIn in an AlternateUniverseFic. [[FreudianExcuse She has]] [[DarkAndTroubledPast a decent reason though]]]]. It's CrazyEnoughToWork.
104* Yoh and Hao in ''Manga/ShamanKing'' are twins. In the anime, especially the 4Kids dub, Hao kept saying it was Yoh's destiny to unite with him. A lot of yaoi fangirls love Yoh/Hao. They are literally a single soul that got split in two, simultaneously explaining the "unite" DoubleEntendre and making this closer to ScrewYourself.
105* Dipper and Mabel Pines from ''WesternAnimation/GravityFalls'', due to the fact that they always hug or hold hands, are one another's OnlyFriend until the start of the series, and are incredibly affectionate and supportive of one another (to the point where their Grunkle Stan claims that it's "unnatural" for siblings to get along as well as Dipper and Mabel do). What certainly helps is that they have a dynamic similar to a SavvyGuyEnergeticGirl romance and are TheNotLoveInterest for each other (frequently sacrificing for/defending one another). In the fan community, the pairing is known as "Pinecest", after their last name. However, it’s considered pretty taboo to a lot of fans, primarily because of the show's creator Creator/AlexHirsch freely admitting [[RuleThirtyFourCreatorReactions to be grossed out by it]] since [[WriteWhoYouKnow Dipper and Mabel are based on Alex and his twin sister Ariel]] from when they were twelve-year-olds. Notably, the show’s official subreddit has outright banned discussing and/or sharing fanart/fanfic of Pinecest.
106** There's also a less-popular pairing of Stan and his twin brother Ford, known as "Stancest", since Pinecest was already taken.
107* There are multiple examples of pairing up Netto and Rockman from ''VideoGame/MegaManBattleNetwork''[=/=]''Anime/MegaManNTWarrior''. It's up to the Gentle Reader to decide which turns on or {{squick}}s him or her more--the game version, where this trope applies in full, or in the anime, where he's just a computer program.
108* Amiboshi and Suboshi in ''Manga/FushigiYuugi'', though a lot of this is fan speculation. Especially [[spoiler:because Suboshi feeds Amiboshi a mind-erase drug ''[[IntimateHealing through a kiss]]'' in episode 40]]. In an author's note in the manga, Yuu Watase claims that she didn't mean for that particular incident to seem so sexual. [[YaoiFangirl Suuure]] [[{{Fanservice}} she didn't.]]
109* The revelation at the end of ''Manga/ChronoCrusade'' that [[spoiler:Chrono and Aion]] are twins hasn't stopped some fans from shipping them. The fact that [[spoiler:Aion]] really does seem to have a brother complex doesn't help dissuade them.
110* One of the fanon yaoi pairings in ''Manga/ThePrinceOfTennis'' involves a set of twins: the Kisarazus, namely Atsushi from Saint Rudolph (short hair, a red bandanna) and Ryou from Rokkaku (long hair, a white hat).
111* There are a few fanfics that pair up opposite gender twins Android 17 and Android 18 from ''Anime/DragonBallZ'' [[http://dh-chan.livejournal.com/205867.html 1]] [[http://dragonkink.livejournal.com/721.html?thread=845777#t845777 2]] (Both of these stories are NSFW.)
112* Many fans pair Vash and Knives from ''Manga/{{Trigun}}''. To be fair, it ''is'' strongly implied that Knives has one heck of a brother complex towards Vash. The first big confrontation between Vash and Knives at the very end of the first ''Trigun'' manga really looks like [[spoiler:a metaphorical rape scene complete with grotesquely obvious phallic symbols.]] Which wasn't even the most disturbing thing about this scene in the first place.
113* The Kongo brothers pairing in ''Manga/Eyeshield21'' fandom has a pretty good following. Agon's a huge narcissist and Unsui is very dedicated to his younger brother. It's not hard to imagine it being a little more than brotherly…
114* Yylfordt Granz and Szayel-Aporro Granz from ''Manga/{{Bleach}}'' are assumed to be twins since they [[AllThereInTheManual have the same birthday]] and it's not that hard to come across fan arts and fan fictions featuring this pairing, known as Granzcest in the Western fandom or [=IruZae=] in the Japanese fandom.
115* Twincest runs rampant in the ''Manga/BlueExorcist'' fandom, with the Rin x Yukio pairing taking up almost 50% of all online romantic FanFiction (and normal boy x girl pairings less than 25%). Interestingly, there is no hint of yaoi in the actual series (especially since Yukio and Rin's relationship is… bad and getting worse mostly on Yukio's side). In fact, chapter 74 appears to have Kato half-calling people out on it… she seems to be doing her best to remind the fans that this [[ShipSinking ship sank]] long ago (and never was there in the first place), though it's mostly PlayedForLaughs.
116* Pretty much every ''Film/TheBoondockSaints'' slashfic.
117* ''Literature/HarryPotter'':
118** The Weasley twins are a prime example of this trope in fanfiction. [[https://www.youtube.com/watch?v=fHK30gPIwU4 Here]] is a good example. It's a song called [[ExactlyWhatItSaysOnTheTin "Brotherly Love"]] by Gred and Forge.
119*** ''Fanfic/FirebirdsSon'' Trilogy plays on the Fred and George question; in it George is female and, while they are quite stated to be in a sexual relationship with Angelina and Lee, several characters have commented that the twins' mother fears they would run off together. The fact that they are hypersexual and extremely perverted (with Georgina confirmed to have had sex with Angela, and presumably Fred and Lee in foursomes) gives credence to this theory.
120** After Rowling told the fans what happens to Luna, there's been a bit of twincest involving her sons Lorcan and Lysander. The fact that they aren't even mentioned in the books, and we know ''nothing'' about them other than that they're twins really shows how dedicated fangirls are.
121** In ''[[https://www.fanfiction.net/s/11868945/22/Harry-Potter-Neko-s-Mate Harry Potter Neko's Mate]]'' the Patil twins engage in sexual exploration with one another.
122** In ''[[https://www.fanfiction.net/s/6687919/9/Marriage-Bliss Marriage Bliss?]]'' when a marriage law is instituted, Fred and George marry each other.
123** In ''[[https://www.fanfiction.net/s/9538425/8/Shadows-And-Light Shadow and Light]]'' Fred and George are dating each other because they're literally "one soul in two bodies".
124** In ''[[https://www.fanfiction.net/s/13916559/10/Voldemort-s-Daughter Voldemort's Daughter]]'' Fred and George have a twin soulbond. Their parents disown them for completing the bond by having sex.
125** In a heterosexual version, [[https://www.fanfiction.net/s/13968561/42/Harry-Potter-and-Defeating-Dark-Lords-Inc Harry Potter and Defeating Dark Lords, Inc]] has Amycus and Alecto Carrow as long-time lovers.
126* Amane "Hanako" Yugi and his younger brother Tsukasa Yugi in ''Manga/ToiletBoundHanakoKun'', and it's almost always Tsukasa on top.
127* In fanfics based on ''Literature/TheLordOfTheRings'' or ''Literature/TheSilmarillion'', Elladan and Elrohir are often shipped together. To a lesser extent, so are their father Elrond and his twin brother Elros, and Amrod and Amras, the twin sons of Fëanor.
128* ''Series/TheSuiteLifeOfZackAndCody'': Zack and Cody together have lots of fans, too.
129* ''VideoGame/DevilMayCry'': It doesn't help that Dante and Vergil are [[{{Bishonen}} ridiculously pretty]] and there's a lack of female characters (that don't look [[LikeParentLikeSpouse like their mom]].)
130* Raul Gureden of ''VideoGame/SuperRobotWarsReversal'' would have fit the more appropriate ScrewYourself, due in fact his female counterpart Fiona Gureden are one and the same character in Reversal. However, upon getting an entry in ''VideoGame/SuperRobotWarsOriginalGeneration'', the two became HalfIdenticalTwins; naturally, fanworks ascended it to this trope, even though {{continuity}} says otherwise.
131* Namazuo and Honebami Toushirou of ''VideoGame/ToukenRanbu'' are technically twins (though they were forged in the same year as at least seven other swords in their family, including Ichigo Hitofuri), and their ship is the most frequent out of all pairings featuring either of them.
132** Kousetsu and Souza Samonji get the same treatment, though they were also forged in the same year as their youngest brother Sayo.
133* On learning that Fai of ''Manga/TsubasaReservoirChronicle'' [[spoiler:has a deceased twin brother named Fai (hence why the Fai we know and love is named Fai),]] the fangirls hit the keyboards hard.
134* In ''VideoGame/{{Xenosaga}}'', Albedo is revealed to have been the conjoined twin of [[spoiler:Junior]]. And let's just say that Albedo… was [[StalkerWithACrush really obsessed with him]], to the point where the thought of being unable to stay with him forever--among other things--drove him [[AxCrazy mad]].
135* A AlternateTimeline fanfic for the [=PS3=] game ''VideoGame/InFAMOUS'', in which the twin daughters of [[spoiler:the first game's protagonist and LoveInterest, Cole [=MacGrath=] and Trish Daily]], become twincestuous lesbians; due to the nature of the fic.
136* Lucas and Claus from ''VideoGame/Mother3'' have been treated in this way.
137* Mario and Luigi from ''Franchise/SuperMarioBros'' have been given this by fans. Most slash fanworks are of them together.
138* ''VideoGame/MegaMan3'': Gemini Man and his clones. It's one of the classic mainstays of Mega Man slash.
139* ''WebVideo/AskThatGuyWithTheGlasses'' and ''WebVideo/TheNostalgiaCritic'' are twins in fics most of the time, with Ask That Guy usually torturing Critic, sexually, emotionally, and physically. [[DesignatedMonkey Fun times for all.]]
140* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
141** A lot of fan art and fan fiction involving Aloe Blossom and Lotus Blossom loves to speculate about what goes on in their spa after hours (wink wink, nudge nudge).
142** Fanon typically has Cloudchaser and Flitter as twins, though in canon it's unknown, but they're commonly shipped together.
143* In ''Fanfic/TheTwoBetween'', though it isn't confirmed, Sunset is sure in-universe that the twins have a relationship of that nature.
144* ''WesternAnimation/EdgarAndEllen'' fandom has quite a few of these.
145* ''Franchise/{{Transformers}}'': If you see Sideswipe and Sunstreaker in a fanfic together, 90% of the time it's because they're banging each other.
146** Likewise, Reflector now exists purely to have three-ways. But then three identical robots becoming one camera… really is asking for it.
147** The jet twins [[WesternAnimation/TransformersAnimated Jetfire and Jetstorm]] too.
148* Kyle and Lane Carlson, twin male models. And the Brewer twins, Derek and Keith.
149* ''WesternAnimation/ThunderCats'': [[WesternAnimation/ThunderCats2011 Both incarnations]] of [=WilyKat=] and [=WilyKit=] have gotten this.
150* ''Fanfic/{{Hivefled}}''; there's nothing actually going on between the SeparatedAtBirth [[spoiler:Gamzee and Feferi]], but if they're caught, their AbusiveParents [[RapeAsDrama have plans]].
151* [[CreepyTwins The Twins]] from ''WesternAnimation/{{Superjail}}'' have somewhat of a fanbase that interprets them as incestuous based on their narcissism and closeness to each other. Certain lines (such as their "date" joke from an early episode) fueled the shipping, although the vague [[RapeAsComedy porn incident that traumatized them]] has been used by supporters ''and'' detractors of the ship to prove or disprove the dynamic being canon.
152* ''Fanfic/ResonanceDays'' has Arzt Kochen and Nie Bluhen Herzen, two [[CreepyTwins identical witches]] (aside from differing {{Red Right Hand}}s) who [[DeadToBeginWith arrived in the afterlife]] together and seemingly [[ShamelessFanserviceGirl cannot keep their hands off one another]] ([[{{Squick}} much to the disgust of their teammates]]). Though they repeatedly claim that they aren't siblings, nobody believes them, and even they couldn't truthfully tell you otherwise thanks to GhostAmnesia. [[spoiler:It's actually a subversion; [[ContinuityNod in life they were]] [[Manga/PuellaMagiKazumiMagica spinoff characters Yuuri Asuka and Airi Anri]], the latter of whom wished to be [[DeadPersonImpersonation identical in appearance]] to the former.]]
153* Len and Rin from ''Music/{{Vocaloid}}'' are constantly paired together, though WordOfGod says they're closer to {{selfcest}} as they were supposed to be mirror images.
154* Pairing the two Ice Climbers together is common in ''VideoGame/SuperSmashBros'' fandom. There's an ambiguity to whether they're siblings or unrelated friends though some shippers present them as lovers and siblings.
155* ''Fanfic/TheRabbitAndThePuppy'' Fanfic pairs Kagami and her twin Tsukasa. {{Yuri}} pairings are somewhat rarer.
156* L and Beyond Birthday from ''Manga/DeathNote'' are frequently portrayed as being twins (though whether or not they actually ''are'' twins, or even related to one another, is up for debate) and very often get into this. In most such works, [[SexualHarassmentAndRapeTropes BB coerces or forces L into it]]… but not always.
157* There's Kinkaku and Ginkaku of ''Manga/{{Naruto}}''. The characters aren't major, but if they were their twincest fandom may be higher. However, there have been fanfics in the past, and some fandom--in forums, and during chapter reviews, who toy with the idea, being that the two of them are constantly together, and they say each other's names in every breath. It's canon that the word Ginkaku has said most in his entire life is his brother's name. And Kinkaku, while normally stoic and composed, manga-wise, flies into a rage whenever his brother is seriously harmed. It also appears they stayed together their entire lives, and neither of them ever got married or had any children. So there's room to toy with the twincest idea, and a few of the fandom has.
158* ''Anime/OsomatsuKun'' features a group of sextuplets. A lot of shipping between every pair, and sometimes even all six together, occurs. As mentioned above, the series itself made fun of this phenomenon.
159* Max and Phoebe on ''Series/TheThundermans'', often called "Thundercest". Just don't tell it to Creator/KiraKosarin, the actress who plays Phoebe, who is ''not'' a fan of the pair.
160* An accidental example occurs in ''[[https://www.fanfiction.net/s/11677577/1/ The Rabbit Returns to ToonTown]]'' due to [[ChildrenAreInnocent childish ignorance]]. Rhoda once caught her four-year-old twins playing patty-cake, which they learned from black-and-white Toons. It turns out that Toons consider "patty-cake" as a very flirtatious act. This dates back to the 1910s when Toons were drawn [[NoBiologicalSex without genitalia]] and resorted to patty-cake as a sex equivalent. Amongst younger Toons, it's not as raunchy, but the act still has a sexually charged element to it. After learning this a few years afterwards, Jack and Rose agreed never to mention that incident again.
161* In the Modern AU ''WesternAnimation/HowToTrainYourDragon'' fic ''[[https://www.fanfiction.net/s/13122923/1/Confusion Confusion]]'', Astrid and her OC twin sister Lillian were involved when they were younger before their parents found out and forced them to separate (blaming Astrid for 'corrupting' her younger sibling). In the course of the fic, the two girls each fall for Hiccup and eventually form a new relationship with him and each other, the trio making arrangements so that they can be together all at once or have just two of the parties involved without the third as 'appropriate'.
162* ''Fanfic/AnEmpireOfIceAndFire'' already has the canonical example between Jaime and Cersei, but the oneshot sequel ''Something About Dragonstone'' also reveals that Jon and Daenerys' twin children Rhaegar and Arya have entered into a relationship during the TimeSkip. Being Targaryens, everyone just shrugs this off.
163* ''Fanfic/MomentaryWeakness'': A source of much speculation among the people of the kingdom. Pyra and Mythra are sisters and are part of the royal marriage, so what exactly does that mean for ''their'' relationship? Their friends have decided it's best not to ask.
164[[/folder]]
165
166[[folder:Films -- Live-Action]]
167* The twist in ''Film/BeautifulKate'' is that Kate not only had sex with her older step-brother but also her actual twin brother, Ned.
168* ''Film/BladesOfGlory'': The twin brother and sister villain-duo of Stranz and Fairchild Van Waldenberg have shared an unusually close bond since childhood and are constantly touchy-feely. They finally fling themselves at each other for a kiss just as the police are hauling them away. Amusingly enough, the Van Waldenbergs' actors -- Creator/WillArnett and Creator/AmyPoehler -- were [[CastIncest actually married in real life]] at the time of the film.
169* [[http://3.bp.blogspot.com/_lLsdaCVk3Kk/R-ln9_rQ79I/AAAAAAAAOsU/o4f5A-pefAY/s320/HarryLukeTreadaway13.jpg Not-so-subtly]] hinted at in ''Brothers of the Head'' with ''conjoined'' twin brothers.
170* ''Series/ChildrenOfDune'': There are strong incestuous overtones between Leto II and his twin sister Ghanima. It's never outright confirmed but they do share many tender moments together, even kissing on the mouth when reunited in the end.
171* ''Film/CruelIntentions 2'' had a scene where identical twin sisters make out in the shower. This film was originally produced as the pilot episode for a Fox TV series called ''Manchester Prep'', but the series was cancelled before broadcast and so the pilot was "spiced up" for video release. One can safely assume this scene wasn't in the TV version. Rather ridiculously, in the scene, the girls claim to only be cousins. This is one of only a handful of sexual scenes involving real-life siblings to appear outside of porn.
172* The 1988 film ''Film/DeadRingers'' features some creepily sexual scenes between Jeremy Irons ''and'' Jeremy Irons as twin gynecologists Beverly and Elliot. It's based on the novel ''Twins''.
173* In ''Film/{{Dobermann}}'', Manu sexually desires his twin sister Nat, and attempts to grope her and has to dragged off her by her boyfriend. Nat, for her part, considers this disgusting and wants no part of it.
174* ''Film/TheDreamers'': An American student Matthew befriends a [[GayParee Parisian]] brother and sister Théo and Isabelle. They claim to have been born connected at the shoulder, even though that can't happen with fraternal twins. It becomes more and more apparent that there is something very… [[{{squick}} odd]] about the siblings' relationship--heavily implied, though never explicitly confirmed. They claim Isabelle was a virgin until Matthew, downplaying it. Whatever's going on, Matthew [[TwinThreesomeFantasy doesn't really seem to mind]]. Everything's fine until someone [[http://en.wikipedia.org/wiki/Paris_1968 puts a brick through the window.]]
175* In ''Film/EuroTrip'', Jenny and Jamie get trashed on absinthe and make out (neither realizing who the other is). They are appropriately horrified when they open their eyes the next morning.
176--> '''Cooper''': Oh, here it is. Bratislava. Hmm. Capital of Slovakia. Oh, here's a fun fact: You made out with your sister, man!
177* ''Film/Feed2017'': It's strongly implied that Matt wants his twin sister Olivia.
178* Subverted in ''Film/GoneGirl'': as the media circus surrounding Amy Dunne's disappearance escalates, the press deliberately starts spreading innuendo that Nick was having an affair with his twin sister Margo. Nick hears this trope invoked by name by a guy watching the news at an airport.
179* CreepyTwins Wendell and Darlene from the horror film ''Film/TheHamiltons''.
180* ''Film/HellboyIITheGoldenArmy'': Okay, the twincest doesn't actually ''happen'', but boy, does Prince Nuada want it to. It could be inferred that it had happened in the past. Considering that anything felt by one is felt by both, it's likely any masturbation experienced by one would automatically be shared with the other.
181* In ''Film/HellraiserInferno'', the Wire Twins Cenobites creep up on Joseph to have a [[FanDisservice deliberately disturbing make-out session]] with him and are seen feeling each other up in a later scene.
182* Boy-girl twins Ryan and Sharpay Evans from ''Film/HighSchoolMusical'' have twincest subtext… even though Ryan also has conflicting gay subtext. On twincest note, they have a suspiciously close relationship, what with singing love songs to each other and playing romantic leads opposite each other. There's Taylor's bizarre statement that, "If Sharpay could figure out a way to play Romeo and Juliet at the same time, her brother would be out of a job." Plus there's that video of "I Can't Take My Eyes Off of You", a song in which Troy, Gabriella, Ryan, and Sharpay all sing--Troy and Gabriella (established couple) sing to each other and Ryan and Sharpay… also sing to each other. Sample lyrics:
183-->''I can't take my eyes off of you\
184I know you feel the same way too, yeah\
185I can't take my eyes off of you\
186All it took… was one look\
187For a dream come true''
188* ''Film/TheHouseOfYes'': The twins blatantly admit to their incestuous behavior, much to their younger siblings' disgust.
189* ''Film/IncestTheMusical'' is a quirky, upbeat -- bordering on RefugeInAudacity -- short student film about high-school twins Alex and Katie getting together. Notably, unlike most examples on this page, though, their relationship isn't portrayed as entirely wrong or evil, instead being framed more along the lines of a typical love story. Heck, it even ends [[spoiler:with a SurprisinglyHappyEnding [[UnusuallyUninterestingSight where no one seems to care]] about the two twins becoming an OfficialCouple]].
190-->''"Foiled by our genealogy!\
191Maybe we've got chemistryyyyy!"''
192* A key theme in ''Film/TheLodgers''. The family's ancestors were a pair of twins who fell in love and married. This doomed their children and every generation after to live out a terrible curse: breed and raise the next generation of incestuous twins, then commit suicide by drowning together. [[spoiler:Rachel]] resists this fate while [[spoiler:Edward]] is eager to embrace it. The tension between attraction and repulsion escalates, and the audience begins to wonder how much of the characters' behavior is driven by the curse and how much is driven by forbidden desires.
193* Very heavily implied with the twin socialite sisters ("We share ''everything''") in ''Film/SpeciesII''.
194* Narrowly averted (at least according to {{Fanon}}) in ''Franchise/StarWars''. The viewers (and the characters themselves) are initially led to expect a love triangle between Luke, Leia, and Han, but then it is revealed in ''Film/ReturnOfTheJedi'' that Luke and Leia are actually long-lost twins. The romance between them is vaguely {{Hand Wave}}d, and the love triangle is instantly resolved.
195** However, the novel ''Literature/SplinterOfTheMindsEye'' was written and takes place before their relationship was revealed and so features romantic scenes with the two, as well as a scene in which Luke openly admires Leia's body. Particularly her "seal-curve hips". Apparently ''Splinter of the Mind's Eye'' was George Lucas's plan B if Star Wars wasn't a big enough hit to make ''Film/TheEmpireStrikesBack'', and would have been developed into a movie had there been no money to make the trilogy as hoped. At this point, he had not decided whether or not Luke and Leia would be family or a romantic item, but with all sources taken into context, it looks like a pretty clear case of AbandonShipping.
196** ''ComicBook/StarWarsMarvel1977'', which also started production long before ''Film/ReturnOfTheJedi'', also features a great deal of subtext early on. There are many, many instances between ''Film/TheEmpireStrikesBack'' and ''Film/ReturnOfTheJedi'' in which either Luke or Leia were trying for a RelationshipUpgrade when they were interrupted by something or other. On a meta-level, it was because the writers knew Han would come back and show whether "I know" meant reciprocation, but looking at it today makes it seem like the Force knew these two were twins and contrived to keep them from sleeping together.
197** ''Literature/NewJediOrder'' (''Franchise/StarWarsLegends''): The Yuuzhan Vong pantheon includes Yun-Q'aah and Yun-Txiin, sibling deities whose domain includes "love and hate and all things opposite". Their usual titles are either [[HalfIdenticalTwins "The Twins"]] or [[ThePowerOfLove "The Lovers"]]. Thought it's possible they either aren't twins or aren't lovers, and the Vong just have [[ContinuitySnarl really confusing mythological canon]]--it happens. (For bonus points, a psyop plants a non-humorous meme in the Vong that the Jedi twins Jacen and Jaina are avatars of the twin gods…)
198* In ''Film/NationalLampoonsClassReunion'', what turned antagonist Walter Baylor into a crazy ax murderer was a prank where he was set up to have a makeout session with what turned out to be his own twin sister.
199* In the 1969 British comedy ''Some Like It Sexy'', a guy gets into a threesome with twins (played by former Playboy playmates Mary and Madeleine Collinson). After a little while, he realizes the girls are paying more attention to each other than him, and when he moves away they don't even notice. He leaves and the girls continue without him.
200* Billy Zane and Creator/GinaGershon's characters in ''This World Then the Fireworks''.
201* The deformed cannibal twins in ''Film/WrongTurn2DeadEnd''. In one instance, the girl gets jealous and violent when she discovers her brother masturbating to the sight of a sunbathing woman. She kills the woman, and the two start to have sex afterwards.
202[[/folder]]
203
204[[folder:Literature]]
205* ''Literature/TheActsOfCaine'': A probably nonconsensual example: Berne is revealed to keep twin sex slaves, [[DepravedBisexual one male and one female]]. This being Berne, if you think he wouldn't [[RapeByProxy order them to have sex with each other]], you plainly haven't read the books.
206* The Duet [[VillainousIncest evil twin rulers of the Seven Kingdoms]] in Morgan Llewellyn and Michael Scott's ''Arcana'' series.
207* In the ''Arcana Chronicles'' series by Kresley Cole, the Lovers card is represented by brother and sister twins. They explicitly… yeah. [[spoiler:Even more {{Squick}} when it turns out the twins seen before are idealized copies; the brother is ugly as sin, and the sister never really existed because all there is of her is a third eye in his chest from when he absorbed her in the womb.]]
208* In ''The Bad Place'' by Dean Koontz, Violet and Verbena Pollard are twins and very… close. But it seems this kind of thing is par for the course in the Pollard family.
209* Implied in ''Literature/TheBelgariad''. It's really, ''really'' difficult to read the opening [[{{Doorstopper}} few hundred pages]] of ''Polgara the Sorceress'' without reading some seriously odd romantic undertones into the relationship between (technically) non-identical twin sisters Beldaran and Polgara. Not only does Beldaran have her sister completely wrapped around her adorably girly little finger, but they're apparently sharing a bed well into adolescence whenever Polgara hasn't run away to live in a tree, and Pol's ''explicitly'' possessive anger when Beldaran gets engaged would be a little freakish in its intensity even coming from an actual romantic rival. (''Technically'' technically, they ''are'' identical, making it even more fun. The physical difference or two comes from sorcerous manipulation in the womb.)
210* ''Literature/BlueBloodsNovels'': [[spoiler: Twins Jack and Mimi Force are actually the angels Abaddon and Azrael, respectively, and are vampires who are "immortal twins"; that is to say they are bonded forever. This life cycle just happens to have them as blood relatives, which doesn't really seem to stop them--until Schuyler Van Alen steps in.]]
211* In ''Literature/BookOfTheNewSun'', twins Agia and Agilus are found to have an incestuous relationship when Severian [[spoiler:enters Agilus' cell the day before his execution, only to find the brother and sister nude and huddled together.]] Agilus admits, "Everything you suspect is true," the implication being incest.
212* ''Literature/ChildrenOfDune'' has some pretty heavy overtones about Leto II and Ghanima's relationship at times. From Leto II's own mouth: "Let us pass puberty living in the same house, and all your taboos will be as a red rag waved in the face of a Sandworm." Perhaps mercifully, he [[spoiler:undergoes transformation into a sandworm-like creature prior to puberty, thus removing this pairing from consideration.]] One of the ''reasons'' Leto transforms is to [[DefiedTrope avoid the certainty of being maneuvered into this]] by the Bene Gesserit, who view this "ship" as the only way to get back control of their [[BreedingCult Kwisatz Haderach program]] after Jessica sabotaged it by giving birth to Paul.\
213…of course, this transformation doesn't stop Leto from marrying Ghanima later. But both of them are in complete agreement about the fact that there will be no weirdo hanky-panky going on, and that all her children will be bastards sired by a [[FeudingFamilies Corrino]] survivor, specifically the [[spoiler:direct descendant of the emperor Leto's father deposed]]. (Though ''they're'' in love anyway, so, [[EarnYourHappyEnding good for them]].)
214* ''Literature/ChroniclesOfTheKencyrath'' plays with twincest with two very different, but parallel, couples.
215** It first shows up with Gerridon and Jamethiel, where it looks like VillainousIncest: They were twins, consorts, and the most infamous individuals in the entire history of their people.[[note]]Gerridon made a DealWithTheDevil, and two-thirds of the entire population's souls were reaped to pay for his immortality. Jamethiel helped.[[/note]] But as the story goes on, the VillainousIncest gets {{Subverted|Trope}}--their twincest isn't portrayed as wrong or as part of their evilness. It was traditional and culturally sanctioned in their time, and their match was arranged by matriarchs [[BreedingCult trying to breed the chosen ones]].[[note]]Inbreeding is the best way to produce powerful Shanir, and twin marriage was especially valuable for this.[[/note]] But because of their infamy, ever since Gerridon and Jamethiel, their people have ''mostly kinda'' stopped inbreeding--although the Ardeth still do. But because of the old tradition, their people now see incest--at worst--as a bad idea, not ''creepy'' or ''immoral''.
216** The second case is with the protagonist and {{deuteragonist}}, Jame and Torisen--another pair of HalfIdenticalTwins who are shaping up to be twincestuous too. [[spoiler:By the fourth book they have {{UST}}, have had a few {{Erotic Dream}}s and TheBigDamnKiss. (WordOfGod says yes, it'll eventually happen.)]] Few people know they're twins, and Jame once wonders, if people knew, whether they would throw them together to {{Invoke|dTrope}} the trope, or make sure they never met again to {{Def|iedTrope}}y it.\
217In their case, twincest is symbolic of self-acceptance. The story plays with the idea of twins as {{foil}}s, mirrors, other halves of each other. One of the big things keeping them apart is that Jame is a DifferentlyPoweredIndividual in a world where that's considered dangerous and untrustworthy--and more importantly, so is ''Tori'', but he denies it. She reminds him of this, and that's what ''really'' bothers him--much more than how this trait is present in ''her'', but how it's present in ''himself''. He can't be her lover until he accepts her--until he [[IAmWhatIAm accepts himself]].
218* HalfIdenticalTwins Valraven and Pharinet Palindrake are lovers in ''Literature/ChroniclesOfMagravandias''. Pharinet justifies this by claiming that they are one soul in two bodies and that they are the last of a great heritage. They conceive a child, but Pharinet [[ConvenientMiscarriage miscarries]]. That doesn't stop the relationship from destroying their family and their spouses.
219* In ''Literature/TheFaerieQueene'' (1590) the giantess Argante commits twincest with her brother Ollyphant '''before they are born!!''' They mingle "in fleshly lust" before in the womb and emerge clasped in the act. Also, they're themselves the product of incest.
220* Implied in Creator/EdgarAllanPoe's Gothic horror story "Literature/TheFallOfTheHouseOfUsher".
221* There's a rather bizarre example in ''Literature/FifthQuarter''. The soul of Bannon is forced to share the body of his twin sister Vree when another man steals his body. Vree goes after her brother's body, and when they find it, they devise a plan that Vree will distract him by seducing him, and Bannon will "push" the interloper out of his body. Partway through, Vree realizes that Bannon is [[ScrewYourself more interested in seducing himself]] than in getting his body back, and calls it off.
222* In ''Literature/ForcedPerspectives'' by Creator/TimPowers, two of the members of Conrad Chronic's cult were a married couple who secretly were twins who had left their home state far behind and faked new, unrelated identities for themselves so they could get married, because their TwinTelepathy left them feeling that they couldn't really connect to anyone else.
223* A sister/sister version in the ''Literature/GaeaTrilogy''. April and August Polo are very much a couple despite being identical twins--which the protagonist comments isn't very surprising given that they (and their seven other sisters) are all clones of their "mother" created after her death and raised in a lab with no outside friends.
224* ''Literature/{{Ghoul}}'': Rika and Saxon Hyde engage in twincest as teens. To amp up the {{Squick}}, they're the product of BrotherSisterIncest themselves.
225* ''Literature/TheGodOfSmallThings'': Twins Estha and Rahel deal with their BigScrewedUpFamily eventually by shutting down, withdrawing from the world, and seeking solace only in each other. They no longer share the bond they once did, and [[spoiler:the book ends with them trying to reconnect in the only way they feel able--through sex]].
226* Referenced by Nick in ''Literature/GoneGirl,'' though not to the same extent as in TheFilmOfTheBook; it's merely mentioned in passing.
227-->[I]n high school, there were always rumors that we secretly screwed. Twincest. We were too tight: our inside jokes, our edge-of-the-party whispers. I'm pretty sure I don't need to say this, but you are not Go, you might misconstrue, so I will: My sister and I have never screwed or even thought of screwing. [[AvertedTrope We just really like each other.]]
228* Shelley and Kipling in Judith Hawke's ''Heart of a Witch'' get into a ''very'' complicated relationship that was hinted at from the beginning with Shelley's possessiveness of her brother. Even more weirdly, this eventually turns into a ''threesome'' with [[spoiler:Snow, the leader of the coven that they join]].
229* ''Literature/HouseOfSuns'': A twist on this trope: The two protagonists are among thousands of both-sex clones of one woman. They are genetically programmed to be space-explorers, and all are supposed to meet once every 200,000 years to share information. Their progenitor forbid inter-clone romantic relationships and, while sexual encounters are said to occur occasionally, the protagonists' long-term consorting is strongly rebuked by their fellow "siblings."
230* ''Literature/InDeath'': Rudy and Piper Hoffman from ''Holiday In Death'' are fraternal twins and longtime lovers. Rudy has admitted that they have tried not to act on the attraction between them and be with other people, but they were miserable because they're attracted only to each other. Piper even had herself surgically sterilized, with Rudy's encouragement. Eve, herself a victim of incestuous rape by her father, is highly squicked out by this, and there are some indications that the relationship has taken a toll on Piper mentally (though it's not entirely clear how much of this is projection on Eve's part).
231* ''Literature/TheJourneyer'' has a pair of twin lovers, Biliktu and Buyantu. It doesn't end well.
232* ''Literature/{{Kire}}'': {{Jerkass}} Ørjan is a ShipperOnDeck of Trine/Tore much to their and their friend Erik's annoyance. He constantly prints out lists of where siblings can get married.
233* In Donna Tartt's ''Literature/TheSecretHistory'', Bunny Corcoran references this trope when he suggests that twins Charles and Camilla Macaulay, who share an apartment, are in it for less innocent reasons than just to save money. This offends her greatly and leads her to comment, "You mustn't think I'm sleeping with my brother just because I won't sleep with you." [[spoiler:[[DumbassHasAPoint He's right, though]], and it's been going on for years; the twins think of themselves as "[[UnusualEuphemism siblings with benefits]]".]]
234* ''Literature/ASongOfIceAndFire'':
235** An ExaggeratedTrope with Queen Cersei and Ser Jaime Lannister. An unusual example of an incestuous relationship in serious fiction, as their affection for each other is depicted as genuine, unforced by either partner, long-term, and stable... at least when the story opens. The events of the plot gradually begin to force them apart. But their relationship dates back to [[PuppyLove childhood]], and their mother's maid saw them doing something sexual shortly before their mother's death when they were ''seven''. Their bond carried through to adulthood in a SecretRelationship that's a marriage in all but name, with Jaime revealed to be the true father of Cersei's children.\
236The most interesting thing about their relationship is the [[LoveIsLikeReligion personal mythology they've constructed around it]]. They see themselves as a single person in two bodies. Jaime is convinced that "If I were a woman, I would be Cersei," and Cersei likewise thinks, "If I were a man, I'd be Jaime." In Cersei's mind the bond goes back to before birth. Their little pseudo-religion even has a prophesy: that they'll die together just as they were born together.
237--->'''Cersei:''' Jaime and I are more than brother and sister. [[SingleMindedTwins We are one person in two bodies.]] We shared a womb together. He came into this world holding my foot, our old maester said. When he is in me, I feel… whole.
238** Twins Aelor and Aelora Targaryen were married, which wasn't unusual since their family practised incestuous marriage regularly. However despite the Targaryens' predilection for incest, Aelor and Aelora are the only noted case of twincest. All other sets of twins within the family were girl-girl or had one died before marrying age.
239%% * Jennelyn, Jeyne, and Nym are TwinThreesomeFantasy, not Twincest
240* ''Stalking Tender Prey'' by Creator/StormConstantine has, within the first few chapters, a pair of HalfIdenticalTwins who, because they are [[spoiler:hybrids of human, and a very oversexualised variation on the Nephilim, and the only two in the area, and therefore can only express themselves to each other]] get into twincest an awful lot. Although--let's be fair--most of the main characters do bedhop with most of the other main characters. In fact, the main antagonist, as [[spoiler:'''the''' fallen angel, effectively Satan]] pretty much gets to bonk 98% of the main characters. Repeatedly.
241* ''Literature/TheThirteenthTale'': Emmeline and Adeline's relationship has very strong incestuous overtones.
242* ''Literature/TimeEnoughForLove'': Protagonist Lazarus Long relates a story about a twin brother and sister he encountered who were unrelated to each other through a remarkable feat of genetic engineering (they have the same parents and were born of the same womb, but have no more DNA in common than their parents did), and were induced from childhood to form a sexual bond with one another for breeding purposes. As they are slaves, he buys them, frees them, and sets them on the road towards being independent human beings, but they still end up marrying each other and pumping out babies.
243** Later on in the story, Lazarus himself ends up in an incestous relationship with his own twin clones/daughters--who also get with each other.
244* Thomas Mann's novella "Wälsungenblut" features Siegmund and Sieglind, twins who seem to go everywhere holding hands, and spend a good chunk of the story attending a performance of Wagner's ''[[Theatre/TheRingOfTheNibelung Die Walküre]]''. Everything goes as expected.
245[[/folder]]
246
247[[folder:Live-Action TV]]
248* PlayedForLaughs in ''Series/AnotherPeriod''. Beatrice and her twin brother Fredrick are in love and regularly have sex. One episode has Freud (yes, ''that'' UsefulNotes/SigmundFreud) trying to cure Fredrick of his supposed homosexuality after being MistakenForGay. When Freud sees Fredrick having sex with Beatrice, he feels the treatment worked and is unphased at Fredrick being with his sister.
249-->'''Dr. Freud:''' Frederick, look at you. You are cured. The masculinity training must have done the trick. I officially declare you a non-homosexual.\
250'''Beatrice:''' Oh, Frederick, I'm so proud of you.\
251'''Frederick:''' You're not concerned at all with the fact that I'm having sex with my sister?\
252'''Dr. Freud:''' Seems perfectly natural to me. Carry on.
253* In the final episode of ''Series/ArrestedDevelopment'' its revealed that [[spoiler:Michael's twin sister Lindsay is [[NotBloodSiblings adopted]]. Her almost ''immediate'' reaction to learning they're not related is to try and convince him to marry her. Later Gob -- their other brother -- comes on to her when he learns about this. She punches him.]]
254* ''Series/{{Beastmaster}}'' had a fraternal twin example in its first season.
255-->'''Tao:''' It says you were born in the same place… and at the same time.\
256'''Gem:''' You are the first to understand.\
257'''Tao:''' This has to be wrong.\
258'''Nye:''' It's not wrong.\
259'''Gem:''' We know our own story.\
260'''Tao:''' But it says you were born of the same mother.\
261''[crickets]''
262* ''Series/DegrassiTheNextGeneration'': Twins Declan and Fiona Coyne were introduced in season 9 as being "very close." In ''Degrassi Takes Manhattan'' [[spoiler:Fiona drunkenly kisses Declan at a party in front of everyone to make Declan's girlfriend jealous.]]
263* Cersei and Jaime Lannister in ''Series/GameOfThrones'', the television show being an adaptation of ''Series/ASongOfIceAndFire'' (see Literature above). From the DVDCommentary for "The Kingsroad".
264-->'''Lena Headey:''' Now this is the scene of a previous crime, double misdemeanour…\
265'''Mark Addy:''' Yeah, a crime against humanity, really…\
266'''Lena Headey:''' [[LampshadeHanging Twincest… which is a lovely phrase.]]\
267'''Nikolaj Coster-Waldau:''' It's a great phrase! Twincest…
268* ''Series/{{Glee}}'': Heavily lampshaded -- though subverted -- with Mason and Madison [=McCarthy=]. Apparently the Cheerios have had to tell them that ''Literature/FlowersInTheAttic'' is not a good example for a relationship, and during the "Home" performance in "Homecoming", Mason sings the line "Boy I love my ma and pa / Not the way that I do love you". Kitty explicitly compares them to [[Series/GameOfThrones Jaime and Cersei Lannister]]. Madison's ClingyJealousGirl behavior comes off as very twincestuous until we find out that it's actually because she's always been a ParentalSubstitute to her brother since their actual parents are always out performing rather than being parents. Madison and Mason work it out, and she backs off.
269-->'''Spencer:''' Aren't you guys dating?\
270'''Mason:''' [[DeadpanSnarker Ha-ha.]]\
271'''Spencer:''' OK, sorry. But seriously, [[CrossingTheLineTwice aren't you guys dating?]]
272* It's impossible to watch Maya and Alejandro Herrera in ''Series/{{Heroes}}'' without thinking about it. [[spoiler:After all, Maya killed everyone but Alejandro and herself during her twin brother's wedding after she learned that his bride-to-be was cheating on him...]]
273* ''Series/{{Intimate}}'': Identical twins Emil and Oskar are on a double date that takes a disastrous turn when one of the girls turns out to be a former classmate of theirs they used to bully. Oskar, who works as an actor, is afraid of getting cancelled, so they decide to do anything she wants in exchange for her not telling anyone about their past, which includes undressing in front of each other and eventually Oskar sucking off Emil (off-screen). Since the show is a CringeComedy, they quickly get over it; a few episodes later, Emil is recounting the incident as a funny anecdote on another date, pulling a JustJokingJustification when the girl [[DudeNotFunny turns out to be disturbed rather than amused.]]
274* ''Series/ItsAlwaysSunnyInPhiladelphia''
275** There was a pair of fraternal male twins that the main characters used to go to school with that were sexually involved. Turns out the entire [=McPoyle=] family is one large, ingrown incestual orgy. It's just about the creepiest thing on television.
276** In "Who Got Dee Pregnant," the gang (minus Dee) think that Dennis was the one who had sex with Dee at the Halloween party (due to Dennis switching costumes with Charlie and Dee with the girl Dennis was trying to hook up with). Dennis is throwing up when they confront Dee, with them telling her she has to go to Mexico to get an abortion--which she states none of them are the father and although she pulled Dennis into the back room, they didn't have sex.
277* It took twelve seasons, but ''Series/LawAndOrderSpecialVictimsUnit'' finally went there in the episode "Bombshell": [[spoiler:Guest star Rose [=McGowan=] played a con artist/swinger who was swindling people with her twin brother -- and also sleeping with him because they "share a soul."]] Elliot even calls the trope by name. It was one of the few things that genuinely managed to shock the seasoned SVU detectives.
278** The possibility of twincest had been used years earlier as a RedHerring with a fourteen-year-old pair of HalfIdenticalTwins. It... turned out to be something quite different.
279* In an episode of ''Series/{{Medium}}'', some characters come across a porno that features this.
280* Twincest is the root cause of dark magic on ''Series/MidnightTexas''. Twin witches Theophilus and Hypatia were getting it on until Theo got beheaded. He got better some 800 years later and they got right back at it.
281* The showrunner of ''Series/{{Riverdale}}'' also worked on ''ComicBook/AfterlifeWithArchie'', and the idea of twincestuous Cheryl and Jason Blossom carried over, even with Jason being a PosthumousCharacter. The ''aesthetic'' of twincest is played with a lot. In the opening scene (their EstablishingCharacterMoment) Cheryl and Jason are framed like a couple: Wearing {{coordinated clothes}}, {{holding hands}}, going on what looks like an OldFashionedRowboatDate, all with a love song playing. Cheryl once describes Jason as her "soulmate". They are seen in a flashback SweetheartSipping. After losing him, Cheryl is referred to as a "Red Widow". There are also shades of twincest in Cheryl's interest in Archie because Archie resembles Jason so much. In episode 10, it's actually called out by name in-universe by Veronica, who is attempting to turn around Cheryl's attempt to bully her and the rest of the gang. However, those accusations appear to be made up on the spot, out of spite, not based on any actual evidence. And despite this aesthetic, it [[SubvertedTrope seems that they weren't actually a couple]]: [[spoiler:Jason was determined to be with his third cousin Polly.]]
282* {{Implied|Trope}} with Katie and Emily Fitch from ''Series/{{Skins}}''. More so Katie than Emily; she states that Emily is "hers" and Naomi--Emily's girlfriend--could never love Emily as much she does. It doesn't help that at one point during the end of the twins' episode in series three, when Emily is confronting Katie, someone in the crowd yells out that Emily should kiss her. And in the book, [[spoiler:the Fitch family are on holiday in France, and Katie steals Emily's phone so she and Naomi can't stay in touch.]]
283* In ''Series/WitchesOfEastEnd'' an episode had villains Ivar and Isis who casually mentioned they were twins after making out in front of Freyr. Freyr even uses the phrase twincest to describe it.
284* Definitely played with by John and Edward in ''Series/TheXFactor'', such as their routine to "Oops I Did It Again", which involved a full re-enactment of the talky bit between Britney and her love interest from the music video ("but I thought the old lady threw it into the sea at the end of the movie"). For anyone masochistic enough to want to see them in action, [[https://www.youtube.com/watch?v=Dr-p-3CC3AU&feature=related here]] is the aforementioned performance.
285* Implied in a ''Series/WithoutATrace'' storyline which had the team dealing with a pair of murderous twin brothers. Jack point-blank accuses one of them of lusting after the other and even if there isn't a physical relationship, he's certainly obsessed with him and wants to take over his life.
286[[/folder]]
287
288[[folder:Magazines]]
289Playboy would feature numerous sisters posing together over the decades (Tweeds, Sanchez, Morrells) including many sets of twins (Campbells, Van Breeschootens, Shannons, Tennisons, Barbis, Everetts, Bernaolas, Collisons, Tubinos). In 1993 and 1998 they went one further with the Porto and Dahm triplets. These would prove so popular that they would issue 'Sisters' and 'Twins and Sisters Too' Specials.
290[[/folder]]
291
292[[folder:Music]]
293* Made [[{{Pun}} explicit]] in Music/LeSexoflex's cheerfully NSFW song "Twincest." The music video features male and female twins gettin' it on with their siblings, animated by pornographic embroidery.
294* Implied when Music/TheVeronicas, a band consisting of twin sisters Lisa and Jess Origliasso, sing "All About Us", a song that, while written by them, was made famous by [[{{Music/Tatu}} t.A.T.u.]], apparently lesbians. The story goes that the song was originally a demo done by the Veronicas; when they couldn't fit it into their lineup, they handed it over to t.A.T.u. Which is not to say that the Veronicas are not twincestuous as hell--see their propensity for taking ridiculously inappropriate-for-sisters pictures. Seriously. Not to mention their [[https://www.youtube.com/watch?v=Q3gjPMv6DT8 music]] [[https://www.youtube.com/watch?v=QfcEKaePGXA videos]]. No… [[https://www.youtube.com/watch?v=ShQTEUjdBxY&NR=1 THIS]] video. Also this is the [[https://www.youtube.com/watch?v=rUR6tEsBO2o&feature=channel official]] video for the first link… and a little more twincest sexy
295** And at least one of them is [[http://www.news.com.au/entertainment/story/0,26278,24120587-7484,00.html rumoured to be a lesbian,]] which would presumably fuel such speculation.
296* Similarly, when Ryan Dan (another twin band, of the male variety) sing mushy romantic duets to one another. Well, at least one can sing soprano very well.
297* More willfully-interpreted HoYay: [[http://i39.tinypic.com/21l51yv.gif Bill and Tom Kaulitz,]] of German band Tokio Hotel.(New .gif for your pleasure! More lap-bouncing, less arm-tugging)
298** [[http://fiction.tokiohotelfiction.com/browse.php?type=categories&catid=1 So…]] [[http://taybeck-fic.livejournal.com/tag/tokio%20hotel/ much…]] [[http://emsevilfic.livejournal.com/ fanfiction…]] It's staggering how… [[http://salv.deviantart.com/gallery/ dedicated]] [[http://www.th-twincest.piczo.com/ these]] fangirls [[http://fuckjakaulitzcest.tumblr.com/ are.]]
299** At least once when performing live Bill has ''dropped to his knees in front of Tom'', while singing a song supposedly about Tom and a groupie. More specifically, he sang "Ich will mit keiner ausser Dir." Which roughly, in context, translates to "I don't want to do it with anyone but you." He ''always'' sings that part to Tom.
300*** Unfortunately, though, "keiner" denotes a female "anybody" (the male form would be "keinem"). Which either rules out the homosexual context or says things about Tom we'd better not go into.
301** Bill has also commented on these stories saying: [[http://www.imeem.com/groups/C54-ty4W/blogs/2007/08/18/0o4yGsx8/bill-kaulitz-answers-24-questions-through-chat "Everybody can have his fantasies… though they are sometimes really absurd… but they do exist for that…"]] Hmm-HMMM.
302** "I'm ready to fall, I'm ready to ''crawl right on my knees to know it all''." Practically on his knees in front of Tom while admitting he's okay with being down there? Oh Bill, [[http://www.tmf.nl/video/39278/ learn some subtlety.]]
303* This seems to be the gist of the relationship between the Kagamine twins of Music/{{Vocaloid}}, at least among the fandom. Though they ''look'' like twins, Crypton originally presented them as such before making them "mirror images," then finally telling the fans to [[ShrugOfGod decide for themselves.]]
304[[/folder]]
305
306[[folder:Myths & Religion]]
307* In traditional Bali culture, fraternal twins (known as ''kembar buncing'') are assumed to have had sex in the womb. If they were born to a poor family, their entire family would be thrown out of town for 42 days and all religious ceremonies would be called off for that period. If they were born to the royal family, however, they would be betrothed to each other.
308* Myth/ClassicalMythology: In Ovid's ''Literature/{{Metamorphoses}}'', the story of [[http://en.wikipedia.org/wiki/Byblis Byblis]] and Kaunos is a one-sided case. While Byblis likes him and admits her feelings, he is completely disgusted by her affection.
309* Myth/EgyptianMythology:
310** Osiris, Isis, Set, and Nephthys were all quadruplets who fell in love while still in the womb together, forming two couples: Osiris/Isis, and Set/Nephthys. From the Middle Kingdom on, Anubis, god of mummification, was changed from being the son of Ra to being the son of Osiris and Nepthys.
311** In some versions of the myth of the divine genealogy, Horus (called "Horus the Elder" o "Haroeris" to distinguish him) was the fifth of the children of Geb and Nut, and this was a way to try to reconcile older accounts in which Horus was a child of Nut. The interesting part comes with the fragments of the "Pyramid Texts" that mention expressly reciprocal sexual encounters between Horus and Seth, something that influenced later accounts where uncle Seth seduced his nephew Horus the Child (also known as Harsiese or Harpocrates). Evidently, the sexual relationship between Seth and Horus was an acknowledged fact during more than 3,000 years of Egyptian religion, even though its details varied.
312* In the Feri Tradition (one of the Neo-Pagan movements), there is a pair of twin gods who basically share all aspects of themselves with each other (and not just in that way), or so claims Website/TheOtherWiki. They also don't have a fixed gender.
313* Myth/MesopotamianMythology: Inanna's relationship with her twin brother Utu is widely interpreted as being very close, with many considering it borderline if not fully incestuous.
314* Myth/NorseMythology:
315** In "Lokasenna" of the ''Literature/PoeticEdda'', Loki accuses [[ThemeTwinNaming Freyr and Freyja]], the sibling fertility deities, of sleeping together, though it's unclear whether this is "truth" or not. He also mentions that his father conceived them with his own unnamed sister in Vanaheim, and that this relationship between brother and sister may be normal in Vanaheim, but it's taboo among the Aesir. Given that nobody denies these things, it may be safe to assume Loki was telling the truth.
316** On the other hand, it is possible that many divine pairs with gender-paired names (Frey and Freyja, literally "lord" and "lady", Njörd and possibly Njörun, Yngvi and Ingun, Ullr/Ullinn and Ullin, Fjörgyn and Fjörgynn, that's right, just one more "n" at the end and it changes the gender) were originally divine pairs whose names denoted some kind of complementarity, without necessarily implying any kind of siblinghood. Only later some sort of siblingship was added to their relationship, and given the similarity in their names, the idea of twinship was probably inevitable.
317** In the ''Literature/VolsungaSaga'', Sigmund is seduced by his sister Signy in disguise, as she believes only in this way she can conceive a son that is strong and loyal enough to help Sigmund avenge their brothers and father on their killer, Signy's treacherous husband Siggeir.
318* The Sioux say twins are the reincarnation of lovers. Whether EveryoneIsBi or UntoUsASonAndDaughterAreBorn is another issue.
319[[/folder]]
320
321[[folder:Print Media]]
322* In 2003, Shane and Sia Barbi sued ''Hustler'' for unauthorized use of photos showing "intimate sexual acts between the twin sisters".
323[[/folder]]
324
325[[folder:Roleplay]]
326* Whilst nothing explicit has happened (''Yet?''), ''Roleplay/SurvivalOfTheFittest V3'' characters Lenny and Elizabeth have a whole lot of {{Subtext}} in their relationship, prompting a lot of "speculation" amongst members of the board. It isn't clear precisely what relationship the pair have, but it is implied it goes further than being simply siblings. Recently the handler more-or-less addressed this issue, quoting a {{Fanfic}} in this first half of one of his posts.
327[[/folder]]
328
329[[folder:Theatre]]
330* ''Theatre/BatBoyTheMusical'': [[spoiler:Bat Boy and Shelley]]... ''and'' it's an InterspeciesRomance too! [[FridgeLogic ...how can you have a twin who's not the same species as you?]]
331* The entire plot of the rather strange--and very sexual--British queer play ''Theatre/OverThere'', where it's a metaphor for East and West Germany. The two-man cast consists of the identical twins Harry and Luke Treadaway, and I can only say that the two certainly aren't uncomfortable with each other.
332* This trope (along with a helping of CreepyTwins) is the premise of Marina Carr's play ''Theatre/PortiaCoughlan''. Portia is haunted by her twin brother Gabriel, who drowned himself as a teenager; the fact that she's still obsessed with him fifteen years later (and that Gabriel is referred to as "unnatural") hints heavily towards this, so it's no surprise when she reveals that their relationship was sexual. It's a bit more surprising when [[spoiler:her aunt reveals that Portia's parents, too, are half-brother and sister, though neither of them knows it.]]
333* Part 2 of Music/RichardWagner's operatic ''Theatre/RingOfTheNibelung'' cycle, ''The Valkyrie'', has Siegmund and Sieglinde: Twins separated at birth, who meet as adults and fall in love with each other. It looks like it's setting up to be SurpriseIncest, but then subverted when they realize they're twins, but go ahead anyways. Sadly for them, Fricka -- goddess of marriage -- is very opposed to twincest and adultery. (Adultery because Sieglinde is married, though it was a forced marriage.) Having a goddess against you is never good news, and Siegmund ends up being killed. But Sieglinde is pregnant and gives birth to the legendary hero Siegfried.
334* This trope (actually done sympathetically) is the centerpiece of John Ford's ever-controversial ''Theatre/TisPityShesAWhore''. Unusual in that the creepiness of the setup comes from a) how similar it is to a regular love tragedy, and b) how its lack of acceptance leads Giovanni to [[spoiler:snap and rip out Annabella's heart]].
335* In ''Film/TheRockyHorrorPictureShow'', Riff Raff and Magenta's relative ages aren't explicitly stated (and there's a small age difference between the actors, though that doesn't rule out the characters being twins), but the website for at least one theatre production described them as twins in some background information [[WordOfSaintPaul written by the director of that production]]. It's only strictly canon to that particular production of the stage show (and some of the other background information on that site is outright contradicted by WordOfGod when it comes to the film), but it's commonly assumed in fanon both for other stage productions and for the filmed version.
336[[/folder]]
337
338[[folder:Video Games]]
339* Per usual [[BrotherSisterIncest/FireEmblem tradition]], ''VideoGame/FireEmblem'' doesn't exempt from this in the case of the eighth series, ''The Sacred Stones''. Doesn't go with the usual route (their ending put them in the position of PlatonicLifePartners), but the plot, other characters' reactions, and even [[Theatre/TheRingOfTheNibelung symbolism]] all point to twincest vibe between co-protagonists [[HalfIdenticalTwins Ephraim and Eirika]]. Ephraim even [[LampshadeHanging Lampshades]] this in ''VideoGame/FireEmblemHeroes''.
340* ''VideoGame/ResidentEvilCodeVeronica'' implies that Alfred's devotion to Alexia goes some way beyond mere intense admiration.
341** The novelization pretty much states it outright.
342* ''VisualNovel/YosugaNoSora'' is the embodiment of this trope with the male lead Haruka having such a relationship with his very twin sister Sora. Among the both of them, Sora was shown more crazy and obsessed with her brother as she constantly fantasizes having sex with him and gets jealous when Haruka interacts with other females.
343* ''VideoGame/MetalGearSolid'', being chock full of HoYay moments, certainly didn't shy from playing with this trope. Liquid Snake strips Solid Snake's shirt off while the latter was unconscious, and there was his desperate need to prove that he was the dominant brother. Naturally, it's kicked up to overdrive in the remake. It also certainly didn't help that Liquid was a LargeHam and his voice actor, Cam Clarke, seemed to have an uncanny ability to make the word "brother" sound very erotically incestuous.
344** Liquid does blatantly say that part of his motivation is that, "in Nature, family members don't mate with each other, but they help each other to survive." [[ArtisticLicenseBiology Bad biology aside]], it's pretty easy to overthink how that would justify him killing his brother instead of 'helping him to survive'
345** In ''VideoGame/MetalGearSolid4GunsOfThePatriots'', when Snake and Liquid are having their final fight, if Snake can't shake liquid off, Liquid will kiss Snake's cheek. However, at the time, Liquid is possessing the body of Revolver Ocelot so YMMV on the level of twincest. [[SubvertedTrope Subverted]] in the fact it's [[spoiler:really just Revolver Ocelot impersonating Liquid]]. The matter is further complicated considering Ocelot had a crush on Snake's identical clone "father", Big boss, which adds LoveFatherLoveSon into the whole mix. The whole thing can be rather… confusing. Then again, it wouldn't be Metal Gear Solid if it wasn't.
346* ''VideoGame/FatalFrameIICrimsonButterfly'', with their whole "becoming one with your other twin". One of the key plot elements of the game is the fact that [[spoiler:the village use to perform rituals in which the older twin would strangle the younger one, who would then become one spiritually with the older twin]] and then they'd get to be togeetheeer foreeveeer. This whole "I want to be with only YOU, [insert other twin's name here]!!" thing happens with pretty much all of the Twin Shrine Maidens depicted in the game, including but not restricted to Azumi and Akane Kiryu, the protagonist Mio and her sister Mayu, and the antagonist Sae with her sister Yae. Sae seems to be the one with the most weirded-out obsession with her sister, since [[spoiler:she seems to all along have fantasized about the day that she'd get to be strangled by Yae]] by the end of the game you find a crystal left by her that is pretty much along the lines of [[spoiler:"Oh Yae, kill me, KIIILLL MEE" like she's getting turned on by the idea.]]
347** Not to mention in the promotional commercials, Mio and Mayu are shown in a number of amusingly suggestive poses together. [[spoiler:The strangling pose Mio puts herself in above Mayu at the end of the game in Normal mode is also very suggestive.]]
348*** Aaaaand some official art has them sitting together or swimming together in bikinis. [[http://www.cameraslens.com/gallery/albums/userpics/10003/2223.jpg Very…]] [[http://www.cameraslens.com/gallery/albums/userpics/10003/poster.jpg very]] [[http://www.cameraslens.com/gallery/albums/userpics/10003/2425.jpg closely.]]
349* In ''VideoGame/KingsQuestIII'', after Alexander frees his twin sister Rosella and talks to her, he seems attracted to her in a not-so-platonic way. Of course, they were also SeparatedAtBirth.
350** The same reason was why a lot of [[http://www.tsl-game.com/ Phoenix Online]] players were scratching their heads at the opening scene of ''VideoGame/TheSilverLining'' (a FanSequel to the series). Sure, it makes logistical sense to keep the comatose twins in the same room where their respective spouses can act as a final line of defense… but the ''same bed?!''
351%%* Weiss and Nero from ''VideoGame/DirgeOfCerberus''.
352%%* Amber and Crystal Bailey in ''VideoGame/DeadRising2''.
353* Lucjan and Myaja, a brother-and-sister fighting team in ''VideoGame/DragonAgeOrigins'', state that "everything they do, they do together." When the PC asks them if that means ''everything'', Myaja asks if they want to find out.
354* ''VideoGame/DukeNukemForever'' has the "Holsom Twins".
355* In ''VideoGame/TheSims2'', if you turn off the switch that prevents incest relationships, twins fall in love very easily, without intervention from the player. Mechanics-wise, it is probably due to their interests and personality traits being alike, therefore making the "perfect" match as far as the game is concerned.
356* Crossing over with the ScrewYourself trope there's Morrigan and Lilith Aensland from ''VideoGame/{{Darkstalkers}}''. Lilith is a shard of Morrigan's soul but she has been given a separate body. Being [[SuccubiAndIncubi succubi]] that survive on pleasure sorta justifies their relationship.
357* A rather bizarre example in ''VideoGame/Drakengard3''. [[spoiler:One's Disciple (basically a bodyguard and a consort combined) is an OppositeSexClone of herself that she created. The clone is addressed as her "Brother" and while they don't do it in the game, the short stories written for the game confirms that they were intimate. Additionally, it’s stated both earlier and later in the game that every Intoner (except Four, who has her own problems) is sexually active, and every one of them has at least some sexually-adjacent action with their Disciple.]]
358* The relationship of twin sisters Sako and Yuko Katagi of ''VideoGame/CriminalGirls'' has elements of IncestSubtext, particularly in regards to Sako and her constant concern for Yuko's well-being. [[spoiler:It turns out that Sako has one-sided romantic feelings for Yuko.]]
359* [[spoiler:Junko Enoshima and Mukuro Ikusaba]] of ''VisualNovel/DanganronpaTriggerHappyHavoc'' are an interesting case, as it's not even hinted at in the game they're introduced. Subtext appears in the what-if light novel ''Literature/DanganronpaTriggerHappyHavocIf''. It then becomes much more explicit in ''Anime/Danganronpa3TheEndOfHopesPeakHighSchool'', with [[spoiler:Mukuro]] being quite submissive and blushing whenever insulted by [[spoiler:Junko]], before [[spoiler:Junko]] violently pulls it out of subtext and into text by slapping [[spoiler:Mukuro]] on the butt (knocking [[spoiler:Mukuro]] to the ground) and doing un-advertiser friendly things to [[spoiler:Mukuro]] with a boot through [[spoiler:Mukuro]]'s skirt. It is not depicted as a healthy relationship at all, as [[spoiler:Junko]] [[DomesticAbuse essentially treats]] [[spoiler:Mukuro]] as a SexSlave of sorts.
360* In ''VisualNovel/SuperDanganronpaAnother2'', this is revealed to be the case with [[spoiler:[[VillainousIncest Kanade Otonokoji]]]]. [[spoiler:Her [[{{yandere}} intense sexual desire]] for her twin sister Hibiki led to her [[SerialKiller killing and maiming over 60 people]] for getting too close to her, including ''[[SelfMadeOrphan their parents]] and [[KickTheDog their dog]]'', all while manipulating and conditioning Hibiki to be totally dependent on her. She even conditioned Hibiki to go into a sort of [[EmptyShell a blank state]] [[ManchurianAgent when given the right trigger]], where she'll obey Kanade's every command. A fact she used to make her murder Setsuka, the one person who acted like a CoolBigSis to her, and to [[NightmareFetishist revel in Hibiki's despair]] before the two of them are executed.]] Suffice to say, the rest of the group is absolutely disgusted by this revelation.
361* In ''VisualNovel/SisterlyBlissDontLetMomFindOut'', both siblings, Ichika and Futaba Sakura are very close and secretly in love with each other. [[spoiler: At the end, they get together when they learn about the other's feelings]].
362[[/folder]]
363
364[[folder:Web Animation]]
365* Fanart of ''WebAnimation/HappyTreeFriends'' Raccoon Twins Lifty and Shifty getting really, ''really'' close is unsurprisingly popular, especially {{Gijinka}}s. Shifty is the one with the hat.
366* Implied in the machinima ''WebAnimation/LiliumSims2'', which revolves around a girl who is in love with her brother. Horitio and Isis aren't specifically noted as twins but they're [[HalfIdenticalTwins near identical]] (with only their sexes and eye colours being different) and are the same age.
367[[/folder]]
368
369[[folder:Webcomics]]
370* Fraternal twins Lucy and Fisk in ''Webcomic/BetterDays''. Whether it happened more than once is a matter of debate. Lucy at least continues to have more than sisterly feelings for her brother well into college. Given that there are several early Naylor porn-folios centered around Lucy and Fisk, it seems likely that they were at least originally intended to have a long-running relationship (as their counterparts in ''Webcomic/BadlyDrawnKitties'' did until his departure) …but then again, those portfolios are [[CanonDisContinuity stricken from the record]] as far as Naylor is considered, mostly because the copyright notices affirm that Lucy is not his original creation.
371* Heavily implied of the Subway Masters in ''Webcomic/BlackAdventures'' (the Subway is not affected by a power outage because "it runs on our ''[[GratuitousGerman bruderliebe]]''"), and [[SurpriseIncest accidentally the case]] for [[spoiler:Black's crush on White when she's revealed to be his twin]]. In the latter case, it's used for ShipSinking rather than titillation.
372* Rick and Kate in ''Webcomic/{{Concession}}'', though that is not by any means the only way they are messed up. Also [[spoiler:Joel's connection to his sister's ghost seems to border on this, though she died too young for anything to really happen]].
373* The twin [[HelloAttorney lawyers]] in ''Webcomic/DevilBear'' have a strong vibe of this going. Given that they are infernal servants and HotAsHell demons, it's not unexpected.
374* Invoked with Jasprosesprite^2 and Davepetasprite^2 in ''Webcomic/{{Homestuck}}''. The Rose and Dave parts of them are just as {{squick}}ed by the idea as the "main" Rose and Dave would be, but they acknowledge that cats don't worry about that sort of thing and trolls are born from an "incestuous slurry", so the Jasper and Nepeta parts don't see the problem.
375* Succubus twins Giselle and Alizee in ''Webcomic/LethHate'', although not voluntary on Giselle's part.
376* Hiroki and Masuji from ''Webcomic/SeiyuuCrush'' are hinted to have a more-than-brotherly relationship, and [[spoiler:this is [[http://seiyuucrush.net/index.php?page=439 confirmed]] in scene 13]].
377[[/folder]]
378
379[[folder:Web Original]]
380* ''Literature/RoguesEndMaster'': The main character and his twin sister are often accused of this while living in their home village of Teckleville. [[spoiler: In one of the Holgard paths, they actually do unknowingly sleep with one another while at a masquerade.]]
381* In ''Tea, Biscuits and Incest'', [[spoiler:Makayla finds out that her ex-boyfriend Jayden is her long-lost twin. Doesn't help that he's also sleeping with their father.]]
382* A lot of fanart depicts [[WebOriginal/OSTan Hacchan and Secchan]], the {{Moe Anthropomorphism}}s of Windows 98 First Edition and Second Edition respectively, together. [[http://ostan-collections.net/imeeji/displayimage.php?album=4&pos=144 This one's safe for work, but most others aren't.]] And even those that don't depict the 98 twins being mutually attracted to each other often have [[GirlWithPsychoWeapon Secchan]] acting {{Yandere}} for Hacchan.
383* A vast thread on the [=RPGNet=] forums, covering creepy gamers, had a poster effectively troll the discussion by promising to elucidate on a story of creepy gamers that involved twincest. The rumored story turned out to be disappointing, though it did get an airing.
384[[/folder]]
385
386[[folder:Web Videos]]
387* ''WebVideo/CriticalRole'', [[WebVideo/CriticalRoleCampaignOne Campaign 1]]: Both entirely averted and parodied with the HalfIdenticalTwins Vex and Vax. The topic only comes up once in-series, when Vax is discussing his [[OfficialCouple love interest]], Keyleth:
388-->'''Vex:''' ''(clearly jealous)'' Yes, yes, Keyleth is so [[PrecisionFStrike fucking]] beautiful, I get it.\
389'''Vax:''' Well so are you, but what the fuck am I gonna do with that? Geez, you're fucking weird!
390[[/folder]]
391
392[[folder:Western Animation]]
393* Andy and Ollie Pesto of ''WesternAnimation/BobsBurgers'' are prepubescent but definitely headed in this direction.
394* ''WesternAnimation/RobotChicken'':
395** The show has a long-running gag portraying the Bush twins, Barb and Jenna, as hard-partying ''Girls Gone Wild'' types, often ending with the two of them making out.
396** During the ''Franchise/StarWars'' special, there was the inevitable skit involving Luke and Leia in bed.
397-->'''Leia:''' That was so wrong.\
398'''Luke:''' ''[grins]''
399* ''WesternAnimation/TheSimpsons'': In "[[Recap/TheSimpsonsS23E11TheDohcialNetwork The D'oh-cial Network]]", the Winklevoss twins make a brief cameo in which they compete against Patty and Selma at the Olympics. The scene ends with Cameron and Tyler making out.
400* ''WesternAnimation/{{Tigtone}}'': The king and queen of Propecia are opposite sex conjoined twins who do have a sex life.
401* Invoked in ''WesternAnimation/YoungJustice2010''. [[UnresolvedSexualTension Superboy and Miss Martian]] go undercover as two twins. While in their disguise they [[FirstKiss make out]], and it takes a while for the latter to transform back into her normal self. Much to the horror of Icicle Jr.
402[[/folder]]

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