I remember reading a manga about a highschool girl who talks to a teacher about advice or something.... he flirts with her a lot but she kind of thinks of it as a joke and well there was this other teacher (not that big) and he was like a cooking teacher or something. I'm pretty sure at one point the girl and teacher live together.

Its not that great of a description (sorry!) but it was really good and i cant remember what it was, and i really want to read it again.

Part of what you wrote reminded me of Melodramatic Library, but that's probably not it.