How long does one breath last?

Mistress Jane determines when the slave may get air - and when not! She ties the slave's hands and then sits down with her nylon ass directly on his face. She sits firmly over his mouth and nose so that the slave has no chance to breathe. Instead he can only hope that his mistress will get up from him again soon. But until then he has to concentrate on regulating his remaining oxygen. How long do you think he can manage with just one breath Mistress Jane tests him to find out!

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