A toilet slave is only existing to suck and gulp, every time his domina sits on her toilet chair above his face and shits her turds out of her intestines. No one's interested in his worthless penis, but he knows, that he's gonna receive a penalty for bad work, that's far beyond his agony barrier. He's the only one that is interested in his salami, and so he defends it from penalty by chewing and guzzling every piece of shit. A good toilet slave can avoid punishment. Maybe.