Jackson's hand clamped around her throat from behind. "Thank you for...demonstrating proper technique, Grandpa Derek," he forced out through gritted teeth, his softening cock still twitching inside her. "But we'll take it from here."

Grandpa Derek's knuckles whitened around his belt buckle, but he merely smirked as he tucked himself away. "Train her well, boy." His calloused thumb swiped through the mess dripping from Stiles's asshole before pressing it against Jackson's lips. "Tastes better when she cries."