Hello.

There's a story I've been searching for which includes:

Castiel as a teacher and Dean as a student. Dean's new at the school and Castiel is the English teacher who assigns the class classical literature. However, Dean interprets it correctly, mocks it (Dante's Inferno) a bit, and Castiel is impressed. I think John left Dean and Sammy alone while he went hunting.

Castiel is hiding a secret about the supernatural too. (Highlight)His brother Gabriel is a werewolf.

I'm not entirely sure if Sam was mentioned in this fic, but I'm pretty certain he was. I don't know if he played a very important role though.

Thank you! :)