Fics like Mulder and Scully

Castiel Novak is an undercover FBI agent working to take down a white collar criminal named Azazel, but Castiel finds himself way out of his depths when the case takes a dangerous turn and Azazel gets involved in an omega trafficking deal. With the help of an OPA agent named Dean, the Bureau and the Omega Protection Agency take down Azazel and his seller, Dick Roman. As it turns out, that case wasn't the last Castiel would see of Dean Winchester, and it isn't long at all before Castiel finds himself falling in love with the fiery, strong-willed omega.

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