This sounds a lot like a scene in sand castle, loll I loved the toxicity of that one
Here is the link for it (^^) hopefully it is the one you're speaking about
https://www.mangago.zone/read-manga/sand_castle/
I went to Sand Castle the one recommended by the person above, then clicked on a recommended list and found this.
https://www.mangago.zone/read-manga/warui_yume/
ooo yeah I feel lIke it could be this one I didn't read the "one-shot and very old part" lloll
Yes, this is it. Thank you so much
It wasn't but thanks. I'll try and read this one too
Posting this again. So what I remember is that it's an old manga, I think it was a oneshot. Starts with 2 guys already in a relationship but the seme starts bringing girls to their apartment and fucking them in front of uke. He tells uke that he can also sleep with other people. So uke also brings home a guy and sleeps with him and when seme returns to their apartment, he hears the uke moaning and realises that he's sleeping with a guy and loses his shit. Seme bangs on the bedroom door yelling at the uke to open the door but use doesn't. He only opens it after he's done having sex with the guy. Seme regrets everything and tells uke he won't sleep with anyone else again and they make up