Mistress Chloe felt that this guy was too forgetful for her to work with him. She told him to do better but he did not look like he could and so she had to force him to do that for his own good. The mistress used her pee to make it more humiliating for him and since he did not want to feel that again, he did his best to change.
Mistress Scarlett wanted her slave to drink her pee and she recorded him as he did it. She did not give him any chance to refuse doing it and he knew that it was something he had to do if he did not want to piss her off more than she was already pissed. So she took a piss into the toilet and she forced him to drink it instead of flashing it down.