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Sam ran his hands along Dean's shoulders, face buried in the crook of Dean's neck as Sam's cock slipped warm and easy inside Dean's body. Muscles were clamping around him, tight and so fucking good as he buried himself balls-deep inside his brother's ass.
“Ngh, Dean,” he moaned, kissing along Dean's collarbone. There was a spattering of freckles against his cheek and he couldn't resist the urge to flick out his tongue and lick every single one of them.
Dean was writhing underneath him, purposefully clenching down on Sam's dick with frustrated impatience. “Fucking move, Sammy,” he panted.
Sam slid out, pausing to look at the slickness of lube and precome glistening off his cock, and the stretched, puckered entrance twitching and contracting around the head, trying to pull him back inside. “Jesus,” Sam moaned, pushing himself back in.
The pace was hard and brutal, and it left them both sweat-soaked and on the brink of release. Sam's hand moved to Dean's cock, stroking it in time with his thrusts. Dean was clenching the sheets until his knuckles were white and his toes curled against the mattress when finally, finally, he came.
Sam's hips stilled as he pumped his own release into Dean's willing body, head thrown back and mouth slightly ajar as he struggled to breathe through his orgasm.
Shaking, Sam gently pulled out of Dean. His entrance was stretched wide from Sam's cock and a steady dribble of come was leaking out. Sam felt his dick twitch in a valiant effort to get hard again and he groaned, flopping down beside Dean.
Dean offered up a towel and Sam wiped himself down as best he could. “One of these days,” Sam panted. “You are going to be the death of me.”
Dean laughed and pulled Sam close. “You love it.”
Sam smiled and kissed the bridge of Dean's nose. “That's the problem.”