The femdom's heels click on the cold stone floor as she paces around her kneeling slave. His hands shake as he holds the chastity device, his eyes downcast. She stops, her heel pressing against his throbbing cock, "You've been a naughty boy, haven't you?" He nods, his breath hitching. She smiles cruelly, "Then you deserve to be locked up, don't you?" He nods again, his cock twitching at her touch. She laughs, "Good boy. Now, lock it. And remember, no orgasm without my say-so." He locks the device, his eyes pleading. She smiles, "Good. Now, let's see how long you can last."