I'm not really sure but it has smth similar with this one
https://www.mangago.me/read-manga/rent_boy/
sorry I don't think it's this one...
I'm camping (●'◡'●)ﾉ
This one? -i could be wrong but i m remembering some other
https://www.mangago.me/read-manga/kurayami_no_ry_wa_tonbo_wo_idaku/
I'm sorry. I see how this has a similar plot but the uke was more sexual than this uke hence they keep calling him a slut. I remember how the Uke was offering himself to Seme for sex and aiding him with his revenge since he also didn't like the other party. By the way, I don't think Seme joined the company because his sole reason was to make uke's his like in this manga...
a manga like this where seme is like the youngest son who enters the mafia or business world and the uke who was the seme's older brother or father's fucktoy helps seme take revenge or take control over everything something like.... A lot of people warn the Seme about uke like he's just a slut and not to take him seriously but it turns out the seme met the uke at a young age and developed a crush so in the end he wanted uke to be his.. I think the seme had blonde hair and uke just had black or brown. The uke is obviously older but not old old
It might be a Japanese manga or Korean manhwa, but I don't think it was in color. I can't completely remember this detail either.
Thank you