e/Incest between twins

Information
has gloss	eng: Incest between twins is a subclass of sibling incest and includes both heterosexual and homosexual relationships. In traditional Balinese culture, for example, a set of twins of the opposite sex were forced to marry each other, since it was assumed that they had had sex in utero. In traditional Mohave culture, opposite-sex twins were thought to have been married in heaven.
lexicalization	eng: Incest between twins
instance of	(noun) either of two offspring born at the same time from the same pregnancy twin

Meaning
Japanese
has gloss	jpn: ツインセスト(Twincest)とはTwin（双子）とIncest（近親相姦）を掛け合わせた英語の俗語表現である。ファンダムで通常用いられる用語である。
lexicalization	jpn: ツインセスト