Mujaki na Wanko to Nekokaburi
So older guy meets younger guy at a drinking party/blind date thing. They end up meeting twice a week later and what do yah know the younger guys apartment gets damaged by fire,so now living with him older guy.
Fake ♂
guy is known as Buddha due to lack of expressions, sensei has lustful expressions. student is a perv too, sensei is shallow.
Hanyuu-sensei No Ryou Seikatsu
Guy wants to be a teacher and keeps receiving rejections, but he gets a letter indicating he has an interview at a posh high school. Well since the guy looks young he is contracted to keep an eye on the students from the dorms undercover. he ends up rooming up with an angry student. pretty sure they'll get together.
Oniisan to Yobinasai