Bound in chastity, the slave's eyes widen as his mistress approaches, her heels clicking on the cold floor. She circles him, her dominant presence filling the room. 'Today, we'll explore your limits,' she says, running a fingernail along his trapped cock. He shudders, his body betraying his desire. She laughs, a sound like nails on a chalkboard, as she grips his bound shaft, her hand working him into a frenzy. 'You'll learn to control your urges, to serve only when I command,' she growls, her voice a whip crack. His body tenses, his orgasm building, but she stops, leaving him on the precipice, his humiliation complete.