The slave's eyes widen as Mistress reveals the key, his breath hitching. She runs a finger along the seam of his chastity cage, his cock twitching desperately. "You've been such a good boy, denying yourself for me," she coos, unlocking the device. But instead of freeing him, she grips his bare cock, her fist tight. "You think you deserve to cum now?" She laughs, pumping him slowly, torturously. "Not yet, pet. You'll cum on my command, and not a moment before." She increases her pace, watching him fight his orgasm, reveling in his humiliation.