This mistress could not understand why her slave was that noisy and she felt that the best way to deal with him was to use her pee to punish him. He was shocked by what she did but the mistress did not care about what he wanted or what he felt. He had to stop being noisy and he learned his lesson after she had peed on him. He changed.
This guy was too full of himself and this pissed off goddess Nemesi. She had to cut him down to size and she did this with her pee. She turned him into a pee slave and she forced him to drink her urine and to do all things that she wanted to be done. He had no choice but to drink her urine as he knew that things could easily get worse.
Goddess Nemesis wanted to have the time of her life and that is what she did by turning this guy into a pee slave. The mistress had a great time torturing this guy with her urine. He did not know what to do other than to follow her instructions and avoid pissing her off any more than she already was pissed at him. It worked for him as she did not do anything else to him other than peeing on him.