Someone please please help, I read this manga a long time ago and I've been looking for it...

I think it is http://www.mangago.me/read-manga/k_sensei_no_yajuu_na_aijou/

Thank you so much, u have saved be

There are 2 works the second one has that scene

I thought it was this one, but I could be wrong :) good luck!
http://www.mangago.me/read-manga/koi_to_wa_yobenai/