"I know you want it," Derek replied, straightening, and continued to slap Stiles' ass, marking it. "You've been denying yourself my cock all week. Denying your Master the pleasure of fucking your hole." He kneaded the pink cheeks of Stiles' ass and then spread them wide, leaning down to spit on his abused hole, watch it slide down. "Don't you get it yet? You need this, Stiles. You need my cock, need to make me come. It's only when my cock is buried inside you that you feel whole. Complete."