Is it this?
https://www.mangago.zone/read-manga/trap_city/
YESSSS I REMEMBER IT WAS SOMETHING SOMETHING CITY IN THE TITLE
Istg I never see ANYONE talk about this manhwa. It was one of the first ones I ever read
I really enjoyed it as the plot isn't too cliche by bl standards so it stayed stuck with me.. I had to remind myself to reread this manga again but just couldn't remember the name
a manga like this where Seme is like the youngest son who enters the mafia or business world and the uke who was Seme's older brother or father or just the opposition party's fucktoy helps seme take revenge or take control over everything something like that plot....
the uke was more sexual in nature hence they kept 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.
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 also wants to help Uke and make Uke his.. I don't remember very well but the seme might have had blonde hair and uke just had black or brown. The uke is obviously older but not old old. This manga is also not recent for sure so released 3 to 4 years ago or more
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