Locked in a chaste room, Young Slave's cock aches for release. His Mistress, through the door, commands him to stroke himself. As he complies, she slips in, catching him mid-action. She grabs his cock, not gently, and begins a rough, relentless slapping with her palm, making him gasp and writhe. His cock, despite the pain, hardens further, betraying his body's masochistic desires.