College Kurt, Teacher Blaine

I'd really like to re-read a story, but I have no idea who wrote it or where I read it. All I remember is that Blaine was, I think, a college lecturer and Kurt was in one of his classes. Blaine after a while asked the class if any of them would be interested in volunteering with some younger kids in their music lessons, it starts off with Kurt and a few other students going but soon Kurt and Blaine end up going alone a lot of the time. In the end Kurt and Blaine start a relationship. I think the story was quite long.

I hope someone can help me!