It wasn't very long possibly a oneshot or part of a compilation. It was about a high school student who was sleeping with his tutor who just happened to also be a teacher at his school. At their last study session near the end of the term she mentioned that at the end of the term she was quitting her job to go home and join her father's company and participate in an arranged marriage arranged by her father for business reasons. During that last session the guy confessed his love and seemingly talked his teacher out of it, but the next day at school during a year end assembly she announced that she was leaving the school to get married.

I read it a few months ago, but forget to take note of the name.

It was hentai, thus I'm post the query here.

sounds like the 4th chapter of Innyuu-zuma no Sono

[img]http://i179.photobucket.com/albums/w302/StealthNin/RikuSpriteSig.png[/img]
A life without pain is a life without joy

That was it. Thanks.