This slave can breathe, but only as dictated by Sara. She loves to control what air goes into his lungs so to make that point she tapes his mouth shut and puts her sock covered feet on his face. Using her toes she pinches his nose shut so that he can't breathe, only to release it long enough for him to deeply inhale her delicious sock scent. He should be grateful that her sock fumes are all his lungs are permitted to inhale.