I'm searching for this manga that had a oneshot about a masochist seme trapping a sadist uke in his room I think, I don't remember who was the seme or uke but it was something like that since they weren't in a relationship until the end. The manga's perspective was from the one I think was the uke and the uke was introduced to the seme by his older sister as her college friend and told him the uke she was in love with the seme. The seme seemed like a salaryman and he saw the uke fighting and understood that he was a sadist and wanted him.

That is as much as I remember, I hope anyone will help me find it.

I ended up finding it after all it took me time since I have read tons of manga, it was a oneshot titled "more pain" from omoisugoshi mo koi no uchi

Thanks for anyone who might have tried to help me and sorry for the trouble I might have caused. m(_ _)m