History Main / Twincest

* Dipper and Mabel from ''GravityFalls''.

* [[WesternAnimation/{{Thundercats}} Both]] [[WesternAnimation/{{Thundercats 2011}} incarnations]] of Wilykat and Wilykit have gotten this.

* Raul Gureden of ''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 ''SuperRobotWarsOriginalGeneration'', the two became HalfIdenticalTwins; naturally, fanworks ascended it to this trope, even though {{continuity}} says otherwise.

* ''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.

* In the [[UltimateMarvel Ultimate Marvel Universe]], there were hints about Quicksilver and Scarlet Witch going down this road from the beginning, until [[spoiler:it was confirmed outright in a recent issue of ''TheUltimates'', immediately before her death.]]

* In ''EuroTrip'', Jenny and Jamie get trashed on absinthe and make out. They are appropriately horrified the next morning.

* Subverted in ''GundamSEED'': Kira and his SeparatedAtBirth twin sister Cagalli meet in the first episode (neither knowing they're related), and when they reunite further in the series, Cagalli comforts the emotionally ragged Kira in a purely platonic way. This is ironically taken as a threat by Flay, Kira's screwed-up girlfriend ([[MindGameShip it's not a healthy relationship]]), despite the fact there's no romantic attraction to it. 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 (who are aware of Cagalli's identity) show a bit of alarm when Cagalli hugs Kira goodbye.

* ''AyashiNoCeres'' plays this trope quite creepily and mixes it with RapeAsDrama. Also averted, in that the actual twins don't have twincesty feelings for each other; they are, however, possessed by their ancestors, who were husband and wife.

* This makes up all the drama in one case in ''Manga/DetectiveConan''. [[spoiler:Raita Banba, a high school friend of Kogoro's, had a fiancee 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 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 stressed from the thought of Raita's and her origins ''and'' the fact that she was an IllGirl, she soon fell into the DespairEventHorizon and as a result, she committed suicide.]]
* ''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 and Valentine had a baby at 13 years old]].

-->'''Lena Headey:''' Twincest...which is a lovely phrase.

* Cersei and Jaime Lannister in ''ASongOfIceAndFire''. 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. (That affection is now rapidly waning, however.) [[spoiler:Jaime is revealed to be true father of Queen Cersei's children, thus making them false heirs to the throne. This eventually is one of the main causes of the following civil war.]]\\\

Goes from pretty nasty to very squicky when it's revealed that they were into each other even as little children -- a servant walked in on them doing something sexual when they weren't even ten years old. Cersei even implies that the bond went back to ''birth'', seeing as the two shared a womb and Jaime came out holding onto Cersei. This squicks the everloving fuck out of Ned Stark.

Goes from pretty nasty to very squicky when it's revealed that they were into with each other even as little children -- a servant walked in on them doing something sexual when they weren't even ten years old. Cersei even implies that the bond went back to ''birth'', seeing as the two shared a womb and Jaime came out holding onto Cersei. This squicks the everloving fuck out of Ned Stark.

* {{A Cruel God Reigns}}: 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 and Valentine had a baby at 13 years old]].

* Crossing over with the ScrewYourself trope there's Morrigan and Lilith Aensland from ''{{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 relationsip.

* Subverted in ''GundamSEED'': Kira and his SeparatedAtBirth twin sister Cagalli meet in the first episode (neither knowing they're related), and when they reunite further in the series, Cagalli comforts the emotionally ragged Kira in a purely platonic way. This is ironically taken as a threat by Flay, Kira's screwed-up girlfriend ([[MindGameShip it's not a healthy relationship]]), despite the fact there's no romantic attraction to it. Further toyed with when Cagalli displays a LuminescentBlush at overhearing Flay admit to her ex-fiance Ssigh that she and Kira have slept together, and when Kira's adoptive parents (who are aware of Cagalli's identity) show a bit of alarm when Cagalli hugs Kira goodbye.

* There is an ''[[NeonGenesisEvangelion Evangelion]]'' [[http://www.fanfiction.net/s/4594095/1/Reis_Daydream one-shot fic]] where a mixup occurs and another Rei is deployed while the previous one is still alive. Cue the two meeting up at their apartment and initiating some quick lesbian action... before it turns out that Rei was fantasizing the whole thing. During class, nonetheless. Overlaps with ScrewYourself, naturally.

* {{A Cruel God Reigns}}: Eric and Valentine. Eric in particular appears to be dangerously codependent on his twin sister, and coupled with his inability to distinguish between appropriate and inappropriate expressions of emotions, it is likely the relationship became physical.

* This makes up all the drama in one case in ''Manga/DetectiveConan''. [[spoiler:Raita Banba, a high school friend of Kogoro's, had a fiancee 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 they were HalfIdenticalTwins, who were separated in a fire as babies, and the two didn't ''know'' that they committed twincest until Hatsune received a call confirming the DNA tests were shown to be true. Already stressed from the thought of Raita's and her origins ''and'' the fact that she was an IllGirl, Hatsune soon fell into the DespairEventHorizon and as a result, she committed suicide.]]

* In an example where the incest ''is'' relevant to the plot, in ''{{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, gangraped, forcibly impregnated, and then DrivenToSuicide.]] And apparently even after they found out, they didn't actually break up or anything.

* This makes up all the drama in one case in ''DetectiveConan''. Raita Banba, a high school friend of Kogoro's, had a fiancee 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 after a fire that killed their biological parents when they were babies, in fact, the two didn't ''know'' that they committed twincest until Hatsune received a call confirming the DNA tests were shown to be true. Already stressed from the thought of Raita's and her origins ''and'' the fact that she was an IllGirl, Hatsune soon fell into the DespairEventHorizon and as a result, she committed suicide.]]

* This makes up all the drama in one case in ''DetectiveConan''. [[spoiler:Raita Banba, a high school friend of Kogoro's, had a fiancee 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 they were HalfIdenticalTwins, who were separated after a fire that killed their biological parents when they were babies, in fact, the two didn't ''know'' that they committed twincest until Hatsune received a call confirming the DNA tests were shown to be true. Already stressed from the thought of Raita's and her origins ''and'' the fact that she was an IllGirl, Hatsune soon fell into the DespairEventHorizon and as a result, she committed suicide.]]

* There are a few fanfics that pair up opposite gender twins Android 17 and Android 18 from [[Manga/DragonBall Dragon Ball Z]] [[http://dh-chan.livejournal.com/205867.html 1]] [[http://dragonkink.livejournal.com/721.html?thread=845777#t845777 2]] (Both of these stories are NSFW.)