I think it's when someone cheats on their partner but the partner knows that and the one cheating also knows that the partner knows. But they cheat anyway.
It is a sub-genre of hentai, in which usually a woman cheats on her husband or boyfriend, gets sexually assaulted, and ends up falling in love with the person she is in conflict with, and this kind of thing will definitely not be added to this game because everything will be ruined.
