Fics like The Upsidedown Sky

Despite having every resource the government could throw at them, within the vast wealth of lore protected and researched by the Federal Bureau of Letters and Arcanae, there were only five obscurely written entries on angels. And the number of actual angels ever encountered by humans? One, and that guy was a dick. So when intel indicates a genuine, living angel has been captured, with dire consequences to the universal balance, the FBLA send their best agents undercover to a clandestine freak show, where black market monsters are brought in for the enjoyment of those with the means to afford it. The mission is one they've done a thousand times: extract the entity and bring it in. And Agent Dean Winchester's seen it all, but he's never seen anything like Castiel.

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