All slave gets is an asshole in his nose - Ass Sniffing

Slave is going to be my human chair. And I'm going to sit on his face and rest my dirty asshole right on his nose. I want him conditioned to only want to sniff my fragrant ass whenever he wants to breathe. After I have him take long deep breaths I put my full weight on his face and smother him. His mouth and face wrapped in duct tape with only his nose to breathe through.. I decide when and what he gets to breathe in.. I expect him to be ready to sniff and clean my ass whenever I need, even after I use the bathroom.