Fics like I Once Loved Sin Itself

Dean goes dark side and Sam can't bring himself to stop his brother. He starts out as Dean's prisoner in the bunker but gets hooked on Dean's blood and Dean's dick. The need inside Sam turns him quickly into his brother's willing consort. Sam doesn't want Dean to stop until he takes him completely. This was inspired by a conversation dollylux and I had after watching the most recent Season 9 episode "King of the Damned." The title is from a Timber Timbre song called 'Mercy'

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