Lady Stefanie wanted her money back to deal with an urgent problem. This loser did not do things her way and she had to punish him. He had lied to her that he would give back the money in a few days but he did not and she was upset. She chose to pee on him to show him the seriousness of the situation and he gave her the money thereafter.
Lady Stefanie was disgusted with how drunk her slave was. She did not want it to happen again under her watch so she dominated the loser using her pee. But she waited for him to get sober first. The mistress then gave him shots to drink but they were not of alcohol, but rather, of her pee. And he had no option but to drink them all. He never drank in her house again.