Nipple clamps bite into her tender flesh, sending jolts of pain and pleasure coursing through her. A vibrator is pressed against her pussy, teasing her, pushing her towards orgasm but never quite letting her tip over the edge. The dominant figure, hidden behind a mask, watches her struggle, her body glistening with sweat. The vibrator is replaced with a larger, more intimidating device, which is slowly pushed into her, filling her completely. She gasps, her body tensing as the device is turned on, buzzing deep inside her, pushing her to the limits of her endurance.