--> '''Xander:''' So...
--> '''Willow:''' So.
--> '''Buffy:''' So...
--> '''Xander:''' We're on a fucking ''spaceship''!

Forever After Earth, aka [[http://www.fanfiction.net/s/9280215/1/Ship-of-the-Line-Forever-After-Earth Ship of the Line: Forever After Earth]], is a response to Zaion's the [[http://www.tthfanfic.org/Challenge-7035/Ship+of+the+Line.htm Ship of the Line challenge on Twisting The Hellmouth]]. It is a Halloween Fic and a mega-crossover that starts off with Series/BuffyTheVampireSlayer, Series/StargateSG1, and {{JustForFun/Earthchild}}, and later expands to include Franchise/LyricalNanoha. [[AlternateUniverse Local versions]] of characters from Literature/HarryPotter, Anime/PuellaMagiMadokaMagica, and Manga/FateKaleidLinerPrismaIllya have also shown up.

Buffy convinces Willow and Xander to find a matching set of three costumes, but the costumes turn out to be Fae. When the spell wears off, Buffy, Xander, and Willow are left with new bodies, life-changing memories, and a city-sized starship.

* The main story, [[https://www.fanfiction.net/s/9280215/1/Ship-of-the-Line-Forever-After-Earth Forever After Earth]], follows Willow, Buffy, and Xander as their new perspectives and resources cause events to diverge wildly from Buffy and Stargate canon.
* The first sidestory, [[https://www.fanfiction.net/s/9750680/1/It-Means-Flame It Means Flame]], focuses on the events on [[Franchise/LyricalNanoha MidChilda]] and the looming threat of the Ori.


!Tropes displayed by this fanfic include:

* AlienInvasion: The trio’s actions in later chapters more or less come off as this to Earth's governments.
* AnatomicallyImpossibleSex: For most humans anyway. The Faes' physical invulnerability allows them to have sex that would certainly injure normal humans.
* ArtisticLicensePhysics: The Fae are presented as nanotechnologically-engineered beings, and more-or-less obey the laws of physics, but their capabilities may exceed what is actually possible.
* BenevolentAlienInvasion: This is what Willow ends up ''trying'' to do.
* BigBrotherIsWatching: Willow has already covered the Earth in nanotech sensors for real-time surveillance of the entire planet.
* BizarreAlienBiology: Male Fae genetalia do not become flacid like human's do, are better articulated, and grow "wet" with arousal the same way females do.
* BlueAndOrangeMorality: The Fae seem to have an even chance of ending up in this territory.
* CasualKink: The Fae are openly into...more than one entry in the Administrivia/PermanentRedLinkClub.
* DeusExMachina: Willow finds a cloaked Goa’uld bomber in orbit over the Earth that provided them with a matter transmission system for instantaneous transport, which comes off this way.
** It is actually FridgeBrilliance, since that al'kesh is a canon plot point in seasons 7 and 8 of Stargate SG-1.
* [[EveryoneIsBi Everyone Is Pansexual]]: The Fae are engineered this way, to the point that it almost comes across as a second puberty when a monosexual human is upgraded.
* FetishFuelFuture: A good description of normal Fae society.
* ForYourOwnGood: The justification by the Fae for their planned forcible conversion of everyone that dies.
* FreeLoveFuture: Fae spend a lot of their time having lots of sex with a lot of people.
* GenderBender: The morph settings that allow Fae to customize their bodies include all sexual characteristics.
** It was also revealed that Oz wore a [[{{Franchise/Mistborn}} mistcloak]] on Halloween. He still has the ability to use allomancy, but when he does, his body transforms to look like Vin's.
* GenderFlip: Harriet Potter and Luneth Lovegood. Also, Shiroko and Illyan.
* GodsNeedPrayerBadly: It is heavily implied that this property of [[AscendToAHigherPlaneOfExistence Ascended Beings]] from Stargate is also the driving force behind the [[FunctionalMagic theurgic spellcasting]] of the Buffyverse.
* HeartIsAnAwesomePower: The Madoka Kaname of this universe is a MidChildan with an affinity for telepathy. She is ''very'' powerful.
* JumpingOffTheSlipperySlope: The trio started out saving the life of someone who was dying of cancer by converting him into Fae with his consent. They then promptly went to planning the automatic conversion of anyone who dies anywhere on Earth, without bothering to ask them first.
* ProtagonistCenteredMorality: Vampires converting humans into more vampires without their consent - bad. The Fae converting humans into more Fae without their consent - good. A ''very'' clear-cut example of the trope, since in any other circumstances, aliens from space who acted in this way would be the villains, but because these aliens are our 'heroes' their every action is treated as benevolent and reasonable.
* PunyEarthlings: Humans are physically inferior on every level compared to the Fae.
* ScrewTheRulesIHaveSupernaturalPowers: Upon inheriting vastly powerful technological resources, the trio promptly take it upon themselves to decide the fate of the human race, fairly confident that no one on the planet Earth can stop them with their lesser technology base.
* ScryVsScry: Over whether or not the Fae will break the masquerade and reveal themselves to the world.
* SpaceElves: Though they are actually a posthuman species, the Fae have heavy shades of this.
* SufficientlyAnalyzedMagic: When Samantha Carter meets the time-space administration bureau, MagiBabble is inevitable.
* SuperiorSpecies: The Fae see themselves as this, both physically, and more troublingly, ''morally''.
* TheRevolutionWillNotBeVilified: The trio’s plan to forcibly convert the recently deceased into Fae is portrayed as a good thing that needs to be done as soon as possible and their actions are moral and just; or at least it’s presented this way when the narrative is from the trio’s point of view.
* TheRightOfASuperiorSpecies: When they visit the SGC, it doesn't even occur to the trio to respect the humans' sense of modesty, making several people uncomfortable with their nudity.
* ThreeWaySex: Buffy(Lyn), Willow(Eelesia) and Xander(Zach), in their Halloween-personalities promptly have a threesome as soon as they get a free moment.
* TotalitarianUtilitarian: Much like the Borg, the trio plan to forcibly convert the human race into Fae, but they believe they’re doing it for humanity’s own good – they regard it as irrational that anyone would resist their efforts.
* UnwillingRoboticisation: Not with cybernetics, but this is essentially the fate of humans who are revived from death via faeification.
* UtopiaJustifiesTheMeans: Stopping people from dying and keeping them eternally young and healthy justifies forcibly converting anyone who's just died into Fae without bothering to consider any other possibilities of emergency care, and also apparently justifies kidnapping them to strand them on an alien world, with no way get back home or even let their family and friends know they are still alive.
** Willow addresses this,
--> '''Willow:''' The system sends everyone to be reborn somewhere where spaceships literally grow on trees ... If anyone wants to return to Earth, I'm not going to get in their way.
* [[VisionaryVillain Visionary Villains]]: The trio believe earnestly in their cause and plan to save humanity from nature – by forcing them to become Fae.
* [[WellIntentionedExtremist Well-Intentioned Extremists]]: The trio actually do have a worthy goal: giving people immortality as well as freedom from disease, poison and even most injuries is highly laudable, but they believe that anyone in immediate danger of dying must be forcibly converted to Fae at once, apparently without bothering to consider the possibility of other type of emergency care.
** Theoretically the "salvation program" is tuned to only pick up the "legally dead", according to faeXander anyway – apparently the gap between ''legally'' dead and ''irretrievably'' dead is wider for FAE tech than earth medicine, not that that's a surprise. None of the examples of people shown being vanished in the story appear to involve those who could be reasonably resuscitated using terrestrial methods.
* ZeroGSpot: So far, most of the erotic interludes have taken place on their starship in orbit.