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

Grandpa Tae'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 Koo's asshole before pressing it against Mingyu's lips. "Tastes better when she cries."