It was story I read on LJ (I think) quite a while ago.
I think pretty much all the glee characters were magical and at Hogwarts. Blaine was with a group of students from the Philippines that I think had to attend Hogwarts for a while because of a natural disaster? I do remember oe younger girl from this group using only femle pronouns for everybody and people getting mad about it until Blaine explains that there is only one kind of personal pronoun in tagalog (not sure if this is correct, I hope I'm not mixing things up...)
As far as I remember, it was a Klaine story.
I don't really remember more and sadly I lost all of my bookmarks when my old laptop crashed...
I'd also like recs for other Hogwarts!Glee fics, if anyone would like to give me those :)