Fics like A Flood of Blood to the Heart

Dean makes Sam flirt with the sole witness of a murder that they're looking into. He meant it as a joke, but Sam gets really into it with Mr. Carraway, and Dean finds himself ridiculously, unshakably jealous of the two of them. Things heat up and escalate-- not just for Sam and the witness, but for Sam and Dean. Warning for copious wincest smoochings. Also Sam might be a tease.

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