When he feels the pressure around him, sucking and swallowing him down, Dean lets out a shout. Normally there would be a warning given--Dean's not a total dick when it comes to showing respect to his bed partners--but he wasn't even aware that it was coming until it did. He moans helplessly as he bucks against restraining hands, pumping hot into the waiting mouth.

If he wasn't enjoying it so damn much, it might almost be embarrassing how quickly he finished.