selfcest

self +‎ -cest

selfcest (uncountable)

1. (fandom slang, fiction) Sexual activity with an alternate version of oneself, such as a clone, duplicate, alter ego, or a version of oneself from a different time or alternate universe.
   • 2013, Boo Patrick, "Selfcest", Manifesto (University of New South Wales College of Fine Arts), April 2013, page 8:

     And this is where selfcest comes in. For those unfamiliar with Adventure Time, it has two series: the main, phallogocentric one, Adventure Time, and another spin-off version, Adventure Time: Fionna and Cake, in which gender-flipped versions of the original characters are presented. Marceline spawns Marshall Lee, Jake turns into Cake, Finn becomes Fionna, Princess Bubblegum is chewed up and spat out as Prince Gumball… you get the picture. Enter Fanfiction, which causes them to hook up. Creepy, yes.

   • 2021 July 2, Sabrina Barr, “Loki fans defend Marvel series over ‘queerbaiting’ claims as director says God of Mischief’s bisexuality won’t be explored further”, in Metro, UK:

     Several Loki fans shared their horror over the idea of Loki and Sylvie getting together, as it would be an example of selfcest.

   • 2022 May 25, Erica Tempesta, “'Selfcest was not on my 2022 bingo card': The Time Traveler's Wife baffles viewers with 'wild' and 'disturbing' oral sex scene between the HBO show's protagonist and HIMSELF”, in The Daily Mail:

     '"The Time Traveler's Wife” having selfcest was not on my 2022 bingo card,' another [Twitter] user commented.

   • For more quotations using this term, see Citations:selfcest.