Looking for Castiel in Hell fics

[wyntereyez]

After reading To Reign in Hell and The Spirit, the Water and the Blood, I have a craving for more fics about Castiel in Hell, preferably stories where he's there for punishment and has perhaps become a demon as a result.

I'd also love some spooky Halloween fics. I know; in Supernatural, every day is Halloween, but I'd love some actual holiday fics.

I don't care about the lengths, genres, or pairings; I read pretty much anything. Thanks!