When Isaac opened his eyes again, Derek smiled, slow and approving, at what he saw reflected. He rolled his hips again, this time to push his cock deeper, to begin the rhythm that would leave bruises--if Isaac were capable of bruising, at least. "Good boy," he breathed. "Taking that cock so easily." He kept steady--as steady as he could manage--as he pushed deep into Isaac's throat, and then pulled back. "Going to fuck your throat, come so deep."