Fics like From Baby Brothers to Blood Bonds and Lovers

Not long after Sam leaves for Stanford, he is kidnapped and sold in the Demon slave market. It's several months before Dean has a chance to check on Sam, and by then the trail is completely cold. It takes Dean a few years before he finally finds Sam, who's been being used both as a source of power (Azazel's blood and his psychic powers make him extremely valuable for such uses), and as a pleasure slave all this time. Dean must help his broken and highly sexualized brother find himself again.

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