The story begins with a dominatrix and her submissive prisoner, the "toilet guy." She introduces him to a new form of torment called scat play - forcing feces into someone's mouth until they can't breathe. The first time they try this, she forces a metal plate into his mouth before sealing his lips with her anus and filling his throat with her feces until she deems it unsafe.
This process leaves the toilet guy gagging and choking, but the dom isn't satisfied yet. She decides to take things further by standing on his face and pelvis during a shower. The water cascades down on them both, but more importantly onto the toilet guy's mouth and nose. She questions aloud how he manages to breathe under such circumstances.
Despite this horrific treatment, the toilet guy remains alive, surprising even his mistress. She recognizes that he's tougher than she initially thought. The story ends with her contemplating whether or not she should push him even further in their next session.