A slash fanfiction involving twins in a romantic and/or sexual relationship. Many fans find this an abomination.
Some Noteworthy Categories of Twincest Fanfiction:
Fred and George from Harry Potter.
Rin and Yukio from Blue Exorcist.
Fred and George from Harry Potter.
Rin and Yukio from Blue Exorcist.
by SilawenGreenleaf June 29, 2011
Get the twincest fanfictionmug. by BobbySmallGland November 17, 2018
Get the Twincestmug.