Hi guys I'm currently looking for a yaoi manga whoes plot I don't remember correctly nor ...

Hi guys I'm currently looking for a yaoi manga whoes plot I don't remember correctly nor it's name. I think that the plots goes like the mc meet a guy on roof top of a building and they make it there secret meeting place not letting others know about it not even there friends or something like that. Then they end up dating each other and I also think that the guy mc met was with some old man on an abandoned mattress there. If anybody know a story like that plz let me know the name of manga as I really want to read it.