twincest

sexual relations with your twin

lucy and anna were twins but they regularly ate eachother out. this is called twincest

by anonimus 1/\ December 1, 2007

twincest

Incest between twins. In the world of fanfiction, this is both a frequent and yummy occurance that we, as human beings, should be eternally grateful for. <3

Hizashi/Hiashi is mad twincest. <3

by Louey March 28, 2007

twincest fanfiction

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.

by SilawenGreenleaf June 29, 2011

Twincest

The act of Incest between twins.

"I can't believe those twins are snogging! That is blatant twincest"

by Joey Masters January 2, 2008

Twincest

A form of incest between twins. Twins having sexual relations.

There is often fanfic involving twins such as Fred and George Weasley having sex.

"I just read this really odd fanfiction that involved a lot of twincest!"

by epsilina August 4, 2007

Twincest

Stuff you say "woah, that's sexy" to.

Woah, that twincest is sexy.

by Kat-chan February 1, 2008

twincest

Twins having sexual relations. Capeesh?

Tom and Bill Kaulitz (Tokio Hotel) have twincest time on the tour bus every night.

by anonymous twc fan February 28, 2009