Mistress Gaia loves pee punishments because they are not as gross as poo punishments. She also loves them because they can be naughty when needed to be and she also loves them because they get the job done. When one is peed on as punishment, he or she is usually shocked to the core especially if it was the first time for them to experience that and it makes them change.
When these mistresses were laughing at the lame jokes and lame things that this guy did, he thought he was charming them. But it turned out they were bored to death and they were sick of him. They wanted him to learn when to stop doing his nonsensical things and that is why they turned him into a human toilet and they took a piss on him. He had to drink it all.
Princess Nikki was shocked to learn that her accountant had been cooking figures yet she had not asked him to do any of that. So she used her piss fetish to dominate and humiliate him. He was shocked at the turn of events because they had benefitted the mistress. She did not care about that and told him she did not want a repeat. She peed on him to express her outrage.