Romantic or sexual relations between relatives through adoption (e.g. between stepparents and their adopted children) or in-laws (e.g. the old hentai plot where a boy's father remarries, and the boy starts shagging his new "sister", "mother", or both). Since they're not blood relations, the tag "[[incest]]" doesn't apply.

h4. See also

* [[Incest]]
* [[Step-siblings]]
姻戚