That--Derek hadn't taught Stiles that. He tried again to frown, but it was difficult to maintain disapproval when his slave was so eager to please, and was pleasing him so sweetly. His fingers tightened in the boy's hair, and he was too sleepy--and lazy--to do anything but let the pleasure build, let the boy's mouth guide him to his release.
It didn't take long.
He barked the boy's name in warning, and held the boy's head tight as he spilled his release into Stiles' willing mouth.