I'm looking for a manga

It's a yaoi? or shounen ai (sorry it's been so long I can't remember) about a new teacher in the school who looks super young? So he's made to stay in the student dorms and pretend to be a student by the higher ups, and eventually falls in love with a student (ik ik, please don't judge me). I've been looking for this for an absurd amount of time, please help T_T