Fics like Do You Want to Play With Magic?

Dean has never been sure if his magic is bad or good. He tries to put it to good use, tries to help people, working as a private detective with his partner, Charlie, but he knows his magic requires a sacrifice - blood, bone, body - and that magic like that can never be wholly pure. Then, out of the blue, a stranger shows up claiming to be Dean’s familiar. The stranger, Castiel, is a cat familiar, and he is determined that out of all the witches in the world, Dean is the one he wants to bond with.

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