Is it this?
https://www.mangago.me/read-manga/open_board_dreamyzz/ (pseudo-incest)
Oh yeah! Thanks!
Whats "pseudo-incest" ??
(English is not my 1st language sorry)
Basically it's incest between family members who have no blood relations (ex. stepsiblings, stepparents, in-laws). So if, for example, your mom married a man who has a son with a different woman, and you got sexually or romantically involved with either your mom's husband's son or your mom's husband, that would be considered pseudo-incest.
So this manhwa is mafia type. As usual seme and uke didn't start great but still continued being each other. However the only thing I remember was that uke had other two sworn brothers within that mafia they served and uke did something which he got paid for, his sworn brothers also took the punishment but the man they were serving for punished them to sleep with uke and they continued to do so out of obligation bec they were dogs & disciplined that way, the two sworn brothers doesn't love the uke iirc. And eventually when uke tried to sleep with them after spending alot of time with seme, he was repulsive abt it.
Kinda long sorry, at first I thought it was one of BWAT' story & checked mafia but seems not idk aaaa