Derek smirked when Stiles exposed his neck, to Derek the collar only enhanced his neck. "Good boy." He smiled, nearly picking the boy up and moving them over to an alley way and down it. He turned a corner and found a bit of privacy.
He pushed the boy's pants down and turned him around so he could see that plug inside the boy. "I promise to give you your laptop tomorrow morning, after our run." He was going to try to run with the boy again. Stiles did better when he was able to get out.
He pushed the plug up to the highest notch. "But you will not provoke anyone, ever again, Stiles." He said into the boy's ear, grinding his hips against the boy's ass.