I'm not sure cuz there aren't that many sex scenes in this one and it's been a "long" time since I've read it but I think the teacher is the uke in this one? And it's kinda popular so you probably read it already.
http://www.mangago.me/read-manga/yukidoke_no_koi/
sorry if this didn't really help .-.
also, i love your username and pfp
This one is a favourite of mine. The art is gorgeous http://www.mangago.me/read-manga/oni_ni_hatsujou/
http://www.mangago.me/read-manga/goodbye_lilac/
one of my favorites
actually i didn't read it (๑•ㅂ•)و✧ thank youuuuuuu ~
(and thanks ..i love it also XD)
..that moment when you already have the manga that you've been looking for in your "want to read" list (￣∇￣") but thanks alot!
thank you ヾ(☆▽☆)
Wasn't the uke technically the seme's student? I mean, I guess he had sex with the seme when he grew up to be a teacher but—
any bl that has seme student x uke teacher ?? if there's a list it would be great too (๑•ㅂ•)و✧