That was more than enough to send Sam over the edge he'd so desperately been clinging to. He gripped onto Dean as though he was the only thing keeping Sam grounded in reality - which wasn't so far from the truth. He rocked his hips frantically, arching up to Dean, whimpering and growling out nonsensical noises before throwing his head back, crying out Dean's name as his entire body tensed, then jerked as his orgasm tore through him.
He came hard, tightening around Dean, milking him. He struggled to breathe and he felt as though every fibre of his body had melted to jelly as he collapsed back against the bed.