In a dimly lit dungeon, a stern mistress takes control, her voice echoing as she orders her slave, "I am going to lock up your useless little cock." The slave, trembling with anticipation, approaches her. She grasps his flaccid member, stroking it gently yet firmly, a sadistic smile playing on her lips. "This is your punishment," she whispers, slipping a chastity device onto his shrinking penis, locking it with a click. She then commands him to masturbate, denying him release, her eyes gleaming with cruel delight as he struggles against his bonds, desperate for orgasm.