Fics like Blood Brothers

Castiel’s grace weakens every day, Leviathan pursue him on all sides, and he’s become a third wheel to a growing companionship between Dean and a vampire. Welcome to Purgatory, a place of exhaustion, violence, and regret. At one time, Castiel would have called himself a righteous, avenging angel. Now, tormented by his sins, he sees himself as a failure. A year apart has created a growing chasm between himself and Dean, and now a vampire drinks Dean’s blood and leads the way to an escape portal. Castiel’s starting to think that spending an eternity in this depraved place won't be enough penance for all his transgressions. Perhaps there’s no escape for him after all.

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