Fics like The Complete Lore of Unicorns: from the Ozarks to Kamchatka

Sam and Dean need unicorn blood for a spell. They go to Arkansas to find a unicorn, miraculously stumble into one, then learn that the spell requires the blood of a unicorn that has fornicated. The unicorn telling them this is, of course, a virgin. Dean takes it into his own hands to fix that.

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