Breathe or Orgasm

Lita is caged, her ankles and arms restrained to the bars, and her hands locked in mitts. A blinding gas mask strapped to her pretty face attached to a pump which controls her breathing. As long as she keeps her wits about her enough to pump in rhythm, she can breathe. Seems easy, until Dart catches her off guard with the hitachi imposing orgasm after orgasm. Lita must stay focused if she wants to breathe, and even more focused if she wants to keep breathing while she cums! How long can she keep her air supply sufficient before Dart releases her...