Mistress Roberta had beef with her professor and she settled it by shitting on him. She made sure that it was as degrading as it could be so that she would not need to do it again to him. The mistress enjoyed seeing him degraded and defeated and she knew that her plan had worked. And that is how she was able to sort out her issue with the professor as he was too scared to piss her off.
Mistress Roberta has to train her new toilet slave and what better way to do that than to strap him under a toilet seat and let him have it all? She spreads her legs wide and lets her piss and shit shoot out of her body and land all over his face. She orders him to make sure that it ends up in his mouth so he can swallow it all down.