What is that one manga that is sort of similar to this one? The premise is these two guys started dating on a whim, they could never stay with anyone else because they would be called too clingy and at a party the seme heard the uke drunkenly talking about his woes so he was like “we should date each other”? Has a very obsessive vibe but I remember it being light hearted and not dark. They shared their locations with each other and the uke had dark hair.