Can't Remember

I'm having a hard time remembering a yaoi that I read. Can't remember if it was about a brother or a childhood friend who liked the seme, but instead of telling him sleeps with a senpai. The senpai knew the uke didn't really like him but offered to go out with the uke if he really planned on giving up his feelings for the seme. Seme knew about the uke was sleeping with his senpai but didn't realize that the one the uke liked was him until the uke turned down the senpai's offer to tell the seme that the one he truly liked was him.

Sorry for the really vague and confusing description but if anyone could post links to stories that match this description I would be really grateful.