Fics like Seven Heavenly Virtues

The Mark of Cain turns Dean into a demon once more. Dean is adamant that this time he's found a way to keep the mark under control but it's clear to Castiel that Dean needs help if he's going to fight the mark's influence until they can find a way to get rid of it. More than anything Castiel wants to save him, but if anyone needs to be saved it's Castiel as he tries to navigate where Dean ends and the Mark of Cain begins. (this is a dark fic from the get go. Read the tags and beware)

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