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
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