One comment here mentioned that the reason Yuri might have messed with Yumino's wife might be BECAUSE it was Yumino's wife. Whether it was really by pure chance (going by what Yuri said about her prowling for men or he actually stalked her). Although I don't and hate stories with cheating especially if one of the MC's are involved but for this case, I believe all parties are at fault. Yumino's too busy, wife was too lonely and couldn't take it anymore and then there's Yuri who knew it was Yumino's wife but of well she's my first love's wife. One way or the other I get to be with him. Twisted but I want to imagine them sorting sht out one way or the other when he gets out at some point.
First Kiss