michip.livejournal.comA little while ago I read what I believe was a fusion fic with Supernatural, but I've never actually watched that show so I can't be sure. Kurt was possessed by a demon for a while without anyone noticing, he manages to corner the Glee club in the choir room. Puck for some reason knows how to deal with this, so he's the one who has to protect everyone from Kurt. He calls Burt to come help him exorcise the demon, who laughs at the idea because apparently his presence is the only thing keeping Kurt together. As soon as he leaves the body, all of the damage he inflicted on Kurt but healed will reappear.
I believe this was a WIP when I read it, but I can't be sure. I can't remember if there was a pairing (if there is one, it was probably Puck/Kurt but it might have been gen too).
Any help to find this is greatly appreciated!