In a dimly lit dungeon, a stern mistress snaps, "I'm sick of your constant masturbation." She attaches a chastity device, denying her slave release. Over weeks, she trains him, ordering handjobs while he's locked up, teasing him with her body. Today, she sits him down, his chastity cage visible. "Show me how you jerk off," she commands. He hesitantly strokes, struggling against the cage. She watches, enjoying his humiliation. "Not like that," she sneers, taking his hand, guiding him. "Faster, harder." His breathing quickens, but he's denied orgasm, left aching and frustrated.