Sam had to fight the urge to thrust up into that warm, wet mouth, with those gorgeous plump lips that looked like they were designed for sucking cock. Dean was a lot better at this than Sam ever expected him to be. Oh yes, it was taking all of his willpower not to grab Dean's hair and fuck his mouth. One hand did find it's way to the back of Dean's head, resting there with a firm pressure, but not enough to force Dean's head down.
Moan after moan escaped Sam. He watched as Dean sucked it. It was one of the hottest things he'd ever seen in his life. He knew he wouldn't last long.