Howling the Moondogs

Fandom: Supernatural
Relationship: Castiel/Dean Winchester
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Canon divergent from 08x23: Sacrifice. Fallen and slowly being eaten up by guilt for having helped Metatron empty out the skies, Castiel seeks refuge at the bunker and tries to find a way to set everything right. He clings to the one connection that he has always trusted to anchor him over the years, until it starts to crumble under the weight of all their combined responsibilities and finally disappears into the dark without a trace.