I criminally cute uke (like too cute, really girly) wants to become a teacher but he's way too young looking and is having a hard time finding a job when he's hired on at a boy's school but instead of being a teacher he has to inflitrate the school as a kinda spy and pretend to be a high schooler again. His dorm mate is an angry, difficult type but they fall for each other until uke decides he can't keep on living a lie. Cute story, nothing really objectionable other than uke's way too girly-ness
Hanyuu-sensei No Ryou Seikatsu