History Main / Twincest

* ''LightNovel/{{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).

* In ''LightNovel/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.]]

* From ''LightNovel/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.

* In the EroticFilm ''Alice in Wonderland: An Adult Musical Comedy'', Alice (here an adult librarian) encounters Tweedledee and Tweedledum, a pair carefree twins who openly engage in sexual acts with each other. Together they help Alice to open up from her prudish past after a three-way makeout session.

A 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. And of course, sometimes even Twincest isn't quite incestuous enough for the writers, and that's when you get ScrewYourself.

In 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 gods who are portrayed as appointed to become husband and wife, or as the first people in general.

Twincest 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. Even with true twincest, sometimes the appeal to viewers comes from the idea of inserting themselves and turning it into the fantasy. TwinThreesomeFantasy is to Twincest as GirlOnGirlIsHot is to QueerRomance. They '''can''' overlap if the twins are interested in both each other ''and'' the third party, but that's rarer.

If the twins have a child together (oh hey there, [[Literature/ASongOfIceAndFire Joffrey]]!), that may be known as tw[[IncrediblyLamePun inbreeding]].

** 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. 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 relationship that's a marriage in all but name. Jaime is revealed to be the true father of Cersei's children, thus making them false heirs to the throne. This eventually causes civil war to break out. The situations it puts Cersei and Jaime into gradually begin to force them apart.\\

The most interesting thing about their relationship is the rich mythology they attach to it. They see themselves as a single person in two bodies. In Cersei's mind, the bond goes back to before birth, seeing as the two shared a womb and Jaime came out holding onto Cersei. They both firmly believe that they'll die together, just as they were born together. Some readers also think that narcissistic Cersei sees their relationship as the closest she can get to ScrewYourself.

* ''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 [[OedipusComplex like their mom]].)

* [[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 ''Danganronpa IF''. 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.

Playboy would feature numerous sisters posing together (Tweeds, Sanchez) including many sets of twins (Campbells, Van Breeschootens, Shannons, Tennisons, Barbis, Everetts, Bernaolas, Collisons). 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.

Playboy would feature numerous sisters posing together including many sets of twins (Campbells, Van Breeschootens, Shannons, Tennisons, Barbis, Everetts, Bernaolas, Collisons). In 1993 and 1998 they went one further with the Porto and Dahm triplets.

Playboy would feature numerous sisters posing together including many sets of twins (Campbells, Van Breeschootens, Shannons, Tennisons, Barbis, Everetts, Bernaolas, Collisons). In December 1993 and 1998 they went one further with the Porto and Dahm triplets.

* Similarly to the above, [[spoiler:the Lutuces]] from ''VideoGame/BioShockInfinite,'' which crosses into ScrewYourself given that they're genderbent versions of the same person.

** Twins Aelor and Aelora Targaryen were married, which wasn't unusual since their family practised incestuous marriage regularly. Aelora caused Aelor's death somehow, and she was driven mad with grief over this fact.

** 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. [[spoiler:Jaime is revealed to be the true father of Cersei's children, thus making them false heirs to the throne. This eventually causes civil war to break out, and the situations it puts Cersei and Jaime into gradually begin to force them apart.]] It only gets worse when it's revealed that they were into each other even as little children--their mother's maid saw them doing something sexual shortly before their mother's death, and Joanna Lannister died when they were ''seven''. In Cersei's mind, the bond goes back to their ''birth'', seeing as the two shared a womb and Jaime came out holding onto Cersei. Some readers also think that narcissistic Cersei sees their relationship as the closest she can get to ScrewYourself.

* ''Film/IncestTheMusical'' is a quirky, upbeat -- bordering on RefugeInAudacity -- short independent 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]].

A 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. [[http://en.wikipedia.org/wiki/Genetic_sexual_attraction (See genetic sexual attraction.)]] 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.

* 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 HornyDevils that survive on pleasure sorta justifies their relationship.

* The twin [[HelloAttorney lawyers]] in ''Webcomic/DevilBear'' have a strong vibe of this going. Given that they are infernal servants and borderline HornyDevils, it's not unexpected.

* 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, [[KillEmAll 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.

* 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 Pinescest.

* Implied in the machinima ''Machinima/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.

* 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 Wiki/TheOtherWiki. They also don't have a fixed gender.

** 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 an IllGirl, poor Hatsune soon fell into the DespairEventHorizon and as a result, she committed suicide. The IllGirl 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.]]

** In ''VideoGame/MetalGearSolid4'', 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.

* Implied thanks to a RelationshipWritingFumble 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.)

* 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...]] Probably a RelationshipWritingFumble.

* {{Implied|Trope}} with Katie and Emily Fitch from ''Series/{{Skins}}''. Whether this is a RelationshipWritingFumble or intentional really isn't clear. Moreso 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.]]