%%This section has been alphabetized. Please place further entries in the proper alphabetical order.
%%General examples go on IncestYayShipping, not here.

* ''Fanfic/AiYoriAoshiKoi'': Chapter 8 reveals that in the past, Kaoru's aunt Suzuno actually drugged and raped Kaoru's father to conceive a child as part of a plan to become the Hanabishi heir. Yeah, it's just as f'ed up as it sounds.
* ''Fanfic/{{Atonement}}'': Amy Dallon has (unrequited) feelings for her adopted sister Victoria. Before dying, Vicky reveals she knew but she pretended to be oblivious because she couldn't love Amy the way she wanted her to.
* ''Fanfic/ABriefHistoryOfEquestria'': In a [[AllThereInTheManual side story]], one of [[ManipulativeBastard Platinum's plans]] was almost derailed when it was revealed that one of the [[SculleryMaid kitchen staff]] of the noblepony she was having done in was pregnant with the grandfoal of the Noble in question. However, said maid was ''also'' the secret daughter of another maid, with whom the nobleman had most certainly sired the younger maid with years ago, leading to this trope. It isn't known whether or not the two younger ponies knew this, or if one knew and the other didn't, but given nature of the Founding-Era Nobility [[DecadentCourt in character]] and [[RoyallyScrewedUp in marriage arrangements]], that knowledge may or may not have had any effect on the matter.
* ''Fanfic/BringMeAllYourElderly'': A variation -- Sockson (movie!Sokka) hits on Katara, the animated version of his sister. The feeling is not mutual.
* ''Fanfic/ACrownOfStars'': Rei cared for Shinji greatly. When Shinji, Asuka and the like returned to Earth and met Rei, she was NOT happy to learn that her brother and Asuka were together now, and she stated she would not tolerate it and she wanted to take care of him personally. And then it was Asuka who was NOT happy and declared that Rei was not taking him away from her.
* ''[[https://www.fanfiction.net/s/10607433/20/Deadly-Eyes-of-a-Phoenix-Reborn Deadly Eyes of a Phoenix Reborn]]'': Harry discovers that his mother was adopted and her actual parents were brother and sister Squibs.
* ''Fanfic/DoingItRightThisTime'': Subverted -- Shinji and Rei had some mutual attraction, but it never really ended up going anywhere what with Rei having NoSocialSkills and Shinji not being much better off. At some point during or after [[ApocalypseWow Instrumentality]] he figured out that Rei was a clone of his mother, something his father had neglected to mention for some reason. Except [[spoiler:unbeknownst to everyone, Naoko Akagi had switched Yui Ikari's genetic material with her own.]] Shinji is still wondering whether this makes that time he accidentally saw her naked less awkward or even more so.
* ''Everything the Light Touches'' (a.k.a. The Lion King 2 1/2): The fic is filled to the brim with incest as it is, but one notable example would be when it's (very casually) revealed that [[spoiler:Kovu and Nala both had Scar as their father, making them half-siblings. ''In the middle of one of their sex scenes, no less''.]] Of course, this only makes it even more titillating for them. Beyond that, there's multiple different scenes where Kovu "entertains" Vitani. Cue the {{squick}}.
* ''WebVideo/FriendshipIsWitchcraft'': Done in Episode 8 "Foaly Matripony". Shining Armor is getting married, but his sister Twilight Sparkle ruins the wedding, drags Cadence off to a cave, and leaves her to die. [[BlackComedy And it's hilarious.]] Also, as for Shining and Twilight, [[NotBloodSiblings they're not biologically related,]] [[RunningGag so it's not creepy!]]
* ''VideoGame/GoldenSun Gag Battle'' (a 4koma doujinshi): There's a joke with Ivan trying out his new Reveal power on Hama and Feizhi's clothes. To be fair, Gag Battle was published before ''The Lost Age'' outed Hama as Ivan's sister.
* ''[[https://www.fanfiction.net/s/13968561/42/Harry-Potter-and-Defeating-Dark-Lords-Inc Harry Potter and Defeating Dark Lords, Inc]]'': It's mentioned that Amycus Carrow and his sister Alecto were in love with one another.
* In ''[[https://archiveofourown.org/works/18179480/chapters/42999212 Harry Potter and the Last Chance]]'', Harry and Hermione get revenge on Ron and Ginny for feeding them love potions by arranging for Kreacher to swap plates around at meals, resulting in the Weasleys getting the potions they were trying to force on their targets, much to the horror of the twins when they see their siblings making out.
* In the MassiveMultiplayerCrossover [[FanWebComics fan web comic]] ''Webcomic/GrimTalesFromDownBelow'' by Bleedman, Minimandy/Minnie seems to love her brother, Grim Junior, in a manner beyond what would be acceptable sibling behavior.
** Her heretofore ambiguous feelings, once made explicit, are also cranked up to AxeCrazy levels as indicated by [[https://web.archive.org/web/20090303143014/http://grim.snafu-comics.com/?comic_id=107 this late strip]]. Although, she is [[NotHimself Not Herself]] there. Afterwards [[https://web.archive.org/web/20100410025402/http://grim.snafu-comics.com/?comic_id=136 she doesn't seem to have given up hope]] and his response seems ambiguous. In still later strips they seem to have settled down to a PseudoRomanticFriendship until Mimi shows up, arouses Minnie's jealousy and just plain arouses Junior.
* ''Fanfic/HigherLearning'': In the original timeline [[spoiler:[[AfterTheEnd after the Third Impact]] Shinji and Asuka’s son and daughter had a relationship.]] Their daughter got pregnant and gave birth to [[spoiler:Kaoru.]]
* ''Fanfic/{{Hivefled}}'': The Grand Highblood and the Condesce produced their respective descendants together and have every intention of making them follow in their parents' footsteps; troll society has no concept of incest, but Gamzee is still not happy about it. He has, however, made flirtatious comments to [[BoyMeetsGhoul the ghost of their half-sister]], but considering his current trauma level nothing was intended to come of that.
* ''Fanfic/HowToBeConniving'' (''WesternAnimation/IceAge''): Done via an OC who turns out to be [[spoiler:Diego's dead sister]] ([[ItMakesSenseInContext it's complicated]]) ''after'' several intimate scenes between the two including a 'kiss'.
** Also {{squick}}y in the fact that the OC knew that [[spoiler:Diego was her brother]] all along but still engaged in a semi-intimate relationship with him. [[spoiler:[[TraumaInducedAmnesia Diego]] on the other hand didn't know until after TheReveal.]]
* ''WebVideo/InfiniteMENT'': Played for laughs in the second episode, where Lingying calls Chifuyu "sterile", where she angrily denies it. When Ichika loudly asks why his sister never got pregnant after "all the times they did it", she yells back that she was on the pill... then remembers she just shouted that out in front of the whole class. [[JediMindTrick She tries to wave her hand and say nobody heard that]], however the class is still shocked and confused. Then she yells the same thing and everybody agrees they heard nothing. [[TooDumbToLive Ichika proudly claims he heard it]], and Chifuyu slams his head into his desk.
* ''[[https://fanlore.org/wiki/In_Fire,_In_Ice In Fire, In Ice]]'' (''Series/WizardsOfWaverlyPlace''): The most infamous and best voted and appreciated fan story in the fandom, in which Justin and his younger sister Alex end up married.
* ''Fanfic/KnightOfSalem'': Subverted for laughs. Jax and his sister Gillian are planning to ascend as the King and Queen of Vacuo. Tyrian assumes this means Jax is planning to have sex with his sister. Jax sputters that no, ''of course not'', they'll both have concubines. Gillian and Carmine (TheDragon), on the other hand, realize they hadn't actually thought that far ahead. And considering that Jax has been using his mind-control Semblance to make {{Sex Slave}}s behind their backs, maybe Gillian wouldn't want any concubines Jax would provide anyway.
* ''Fanfic/LastMageOfKrypton'': It's strongly hinted that the Carrow siblings do more than just share a house...
* ''Fanfic/LeagueOfExtraordinaryGentlemenTempestRewrite'':
** Jack Nemo and Greta Mors have been in an unhealthy relationship since their teens
** Their daughters Shakti and Chanda confess their intimate feelings to each other on their last night on Earth, kiss and make love.
* ''Fanfic/LifeOfTheLegendaries'': Implied with Latios and Latias. One fan called it "wincest".
* ''Fanfic/LightAndDarkTheAdventuresOfDarkYagami'': It's mentioned that the reason Light and Dark Yagami [[ThereIsOnlyOneBed share a single bed]] is "only because [[RougeAnglesOfSatin there parents were to]] [[HaveIMentionedIAmHeterosexualToday poor to get separate rooms]] [[SuspiciouslySpecificDenial its not like their gay or anything]]!" Hmmm... Though it loses all subtext around chapter six when their father walks in on them, Misa, their sister, [[ParentalIncest their mother]], and "that girl from the bus" all "sexing" together.
* ''Fanfic/MegaManReawakened'': Due to a programming bug Roll falls in love with Megaman at first.
* ''Fanfic/TheMountainAndTheWolf'': While the Wolf makes constant (''constant'') crass comments about Jaime and Cersei's incestuous relationship, he allows them to sleep together (not every night but as a reward for Jaime besting a Slaaneshi champion). Goes even further when Sigvald the Magnificent shows up, who looks ''exactly'' like Joffrey (both being the product of a brother and sister union).
* ''Fanfic/NalaMyFathersMadness'': Scar tries to [[ArrangedMarriage arrange a marriage]] between his daughter Nala and her half-brother Nuka. If Nala declines, he states he'll have her killed and instead marry Nuka to his full-blooded sister Vitani.
* [[https://www.fanfiction.net/s/5621596/1/The-Old-Life-Alive-Again The Old Life, Alive Again]]'': They're technically not siblings, but [[Franchise/KingdomHearts Roxas and Xion]] are the main pairing. Keep in mind that one is Sora's Nobody and the other one [[spoiler:is his clone]]. The other Nobodies (except Axel, Larxene, and Demyx) naturally don't take kindly to this, as they believe Nobodies should be incapable of loving each other.
* ''Fanfic/TheOnceAndFutureKing'': The main character, Prince Aziru, is the product of incest between [[CainAndAbel Zuko and Azula]], who have plenty of IncestSubtext in the [[WesternAnimation/AvatarTheLastAirbender original show.]] Unlike most examples of RoyalInbreeding, the siblings are not married (instead on opposite sides of a civil war for the throne of the Fire Nation), and Azula only chose to have a child with Zuko so they would have pure, strong RoyalBlood. Aziru, along with everyone else, doesn't know who his father is yet, and only sees Zuko as the EvilUncle he has to kill.
** It should be noted that it's very unclear whether the sex was consensual, on either side. We don't know anything about how willing Zuko was, and Azula never specifically says she chose to have a child with him.
* ''Fanfic/OnceMoreWithFeeling'': Defied. Shinji has decided that he will romantically pursue Asuka and treat Rei like a sister this time around. He still has to remind himself that Rei is his half-sister sometimes, though, since despite loving her like a sibling, he still finds her physically attractive.
* ''Fanfic/TheOneILoveIs'': Although Shinji likes Asuka he also likes Rei (and both girls like back). However Rei does not want to tell him she is his mother's clone because she is afraid that it will kill any possibility of having a love relationship with him. Later Shinji learns about her origin but he does not care about it because she is still Rei.
* ''Fanfic/OneiroiSeries'' (''Webcomic/TheOrderOfTheStick''): [[WithGreatPowerComesGreatInsanity Deirdre]] has a 'thing' for men in her family. She deliberately puts [[BigBrotherInstinct Terentius]] in a position where he can't help but confront and nurse lust for her, which is torturous enough for him to [[TearsOfRemorse break down in tears]], once when he masturbates to her and again when she actually gets him to do the deed. Deirdre's not a nice sister.
* ''Fanfic/PerfectDiamondWorld'':
** Elsa and Anna are sisters in a relationship. It's implied that Anna was drawn to Elsa because she's the only person she feels truly safe and loved around.
** [[spoiler:Agdar]] fell in love with his sister Signy, however he was caught and punished. The two were [[spoiler:split apart into alternate universes]] and [[spoiler:forced to live as mortals for all eternity]].
* ''Webcomic/PowerpuffGirlsDoujinshi'' takes the mild vibe between [[WesternAnimation/DextersLaboratory Dexter and Dee Dee]] mentioned below and runs with it.
* ''Fanfic/TheQueenOfHearts'': A SurpriseIncest example -- it turns out that Elsa and Anna have a half-brother from [[spoiler:when their mother was imprisoned and [[ChildByRape raped]] during a war prior to their birth]]. It was carefully arranged that they'd never meet or be arranged to marry, however their brother [[spoiler:Hans]] previously tried to marry ''both'' of them at different times without his father's consent. Elsa learns the news first and tries to keep it from Anna, but Anna ends up learning a few days later. They both decide to never tell anyone.
* ''Fanfic/QueensOfMewni'':
** One of the most unforgivable crimes, one that merits banishment from the Butterfly Kingdom, is incest with one's sibling. [[spoiler:Swan Redbird]] was busted committing this when people noticed her children had ''too'' strong a StrongFamilyResemblance to her when Butterfly children tend to look more like their fathers. [[spoiler:And her children did...it's just that their fathers were Swan's brothers.]]
** Venus was accused of this with her brother Planet when a series of nude portraits he had painted of her got stolen and released to the public. They didn't commit it (that's one taboo the EthicalSlut Venus would ''never'' cross), but Venus's reputation was so poor already that the people were ready to believe it, and her reputation never recovered.
** It's not explicitly stated but strongly implied that Fortuna Butterfly slept with her brother Space...and their niece Celena caught them. The shock of what Celena told her is believed to have caused the stroke that killed Hesperia.
* ''Fanfic/RelationshipsSeries'' (''Franchise/LyricalNanoha'': One of the threesomes in ''A Day in the Life'' is Ginga and her adopted siblings Wendi and Nove. [[spoiler:Genya ultimately ends the relationship by having Ginga reassigned, though, but the three of them say they will take the time to think about their feelings for one another]].
* ''Fanfic/ResonanceDays'': The Twins are two near identical Witches, only differed in appearance by their Witch Remnants, who are not just involved, but nearly constantly fooling around with each other. [[EvenEvilHasStandards Even their fellow Void Walkers find this disturbing]], to say nothing about the heroes, and all sides roll their eyes when the two, Arzt and Nie, claim they ''aren't'' actually related. [[spoiler: They are in fact correct, they are two characters from ''Manga/PuellaMagiKazumiMagica'', with Arzt being the Witchform of Yuuri Asuka and Nie the Witchform of Airi Anri, the latter of whom wished to look like the dead Yuuri to avenge her and kept the appearance when she died. Neither remember these details however.]]
* ''Fanfic/SecondBiteOfTheCherry'': Jin Guangshan is heavily suspected from being his nephew's biological father, as he was rather close with his sister and her marriage happened in iffy circumstances. Heavily doting upon Jin Zixun certainly didn't help the rumors.
* ''Fanfic/TheSecondTry'': Discussed. [[AfterTheEnd After Third Impact]], Shinji and Asuka are the only surviving humans. At one point they argue that, if they have children and let them repopulate the world, sibling incest would be a problem. [[spoiler: Fortunately this becomes a non-issue.]]
* ''Fanfic/ShowaAndVampire'': Yuji Fudo ([[Anime/YuGiOh5Ds son of Yusei]]) is known to sleep with his twin sister.
* ''[[http://archiveofourown.org/works/736414 Silver-furred Secrets]]'' (''Literature/WarriorCats''): A {{Lemon}} fic which ships Stormfur with his sister Feathertail.
* ''[[https://www.fanfiction.net/s/12915365/6/A-Slytherin-way-of-being A Slytherin way of being]]'': Flora and Hestia Carrow's parents are brother and sister.
* ''WebVideo/SupernaturalTheAnimationAbridged'': In the second episode, Sam and Dean "hug" each other. Due to RuleOfFunny it's never mentioned again when homosexuality is discussed.
* ''Fanfic/TheirBond'': It's noted that Queen Eldora's Maderone was her brother. Said brother was also her lover. A week after Eldora died, her brother Kelen [[DeathByDespair also died]]. It's also rumored that Eldora's children were actually Kelen's, not her husband. Her husband was more [[TheMistress interested in their maid]] than in Eldora herself. Eldora didn't mind and their children were friends.
* ''Fanfic/ThousandShinji'': Rei was in love with Shinji even though she was his mother's clone. However Shinji regarded her like a sister and was in love with Asuka. Still when Rei revealed her genetic make-up to him and Shinji figured out her feelings he did not seem concerned about her origins. In fact he told: "If you wanted a threesome with me and Asuka why didn't you ask us?". After the FinalBattle, Shinji [[spoiler:[[MarryThemAll claimed]] Rei, [[FieryRedhead Asuka]] and [[TheLadette Misato]] as his wives.]]
* ''Fanfic/TheTruth'': The titular truth is that Applejack and Big Macintosh are Apple Bloom's parents, and that they're really step-siblings. [[spoiler: They eventually marry, with another foal on the way.]]
* ''Fanfic/UsAndThem'': [[VideoGame/FinalFantasyVII Aeris and Sephiroth]] were [[AlternateUniverse raised together as siblings]], though they eventually do fall in love and get married. In the side-story "99 Shades of Silver", a book of the same name comes out which is [[VeryLooselyBasedOnATrueStory very loosely based on their relationship]], but makes them actual siblings and plays the "incestual forbidden love" angle. They don't take very kindly to it.
* ''[[https://www.fanfiction.net/s/7365434/1/Vacation-from-the-Norm Vacation From the Norm]]'' (''WesternAnimation/KimPossible''): Subverted. In the first volume, Global Justice head Betty Director appears to have betrayed GJ and has seduced her brother Sheldon, aka Gemini, leader of the World Wide Evil Empire. In [[https://www.fanfiction.net/s/8247998/1/Vacation-from-the-Norm-Bk-2-Journey-of-Discovery the sequel]], [[spoiler: it's revealed that [[{{Humanshifting}} Camille Leone]] was impersonating Betty Director and was the one sleeping with Gemini. The real Betty had gone underground, and was actually romantically involved with Agent Will Du.]]
* ''Fanfic/ValesUnderground'': Twin siblings Qrow and Raven Branwen have shades of this, with Raven being the initiator. She has some flirtatious behavior with her brother that is clearly more than subtext. Even WordOfGod notes that those undertones weren't accidental. [[spoiler: Confirmed in the seventh chapter. Raven has been sexually abusing Qrow ever since they were teenagers.]]
* ''Fanfic/{{Warp}}'' (''Literature/{{Ward}}''): Deconstructed. Amy Dallon's unrequited and obsessive love for her adoptive sister Victoria ruined her relationship irreparably and destroyed Vicky, who is very scared of her formerly dear little sister.
-->"Every word he spoke really only confirmed the worst of my suspicions. It wasn't that Tattletale or the stress or the Nine that put things into her head; the desire and will to change, control, and ''take'' me had always been there, and everything else had merely exposed it."

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