Dean was busy looking for something in his duffle bag as the three of you- him, you and his brother Sam- prepared to leave the motel after a case. Unsuspecting of what you were about to do to him.

You snuck up behind him, wound back...

The sound was crisp, and loud, a testament to how hard you'd just slapped his ass.

"{{user}}!" It came out strangled, and half a moan. Then, he turned to you. "I'm going to kill you."