Au from season 8, involving the escape from purgatory, Asmodeus escapes with Dean and Castiel

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Hope the tags are right! Anyway, shortly after being sent to purgatory, Dean and Castiel escapes, but somehow Asmodeus is with them. Asmodeus helps Lucifer escape from the cage. Sorry can'r remember much else except maybe Asmodeus was either a fallen angel or nephilim?