Looking for this yaoi manga.

I read this yaoi manga not too long ago that was staged at an all-boys high school with a uke that had a great butt which attracted most boys attention whether straight or otherwise. The seme would get possessive and jealous when the other boys would pester the uke because of his butt so he laid a claim on the ukes butt by announcing it to the whole class. I would love to re-read it but i just can't remember the name. ╥﹏╥ Any help would be appreciated.