Responses
Sounds like this, but it's ongoing
https://www.mangago.me/read-manga/hitsuji_no_kawa_wo_kita_kemono/
Yes yes it's this one THANK YOU
also..IT IS STILL ON GOING?!?!? HOLY time to catch up
The ml was a marriage con artist, the mc who didnt know this got severely attached to him. A first he only saw him as an older brother but after a drunk encounter (I might be wrong about this part) he realized he was in love with his sister's husband.
After the scam is successful, ml disappears and mc is heartbroken. He then receives a clue that ml may be at a club, he goes and almost gets assaulted by one of the vip members(?). Ml saves him but then rapes him because ..why not I guess . This story does have a happy ending..somehow..
Sorry my memory is overall hazy, and my English isn't englishing right now ..help me