When this mistress had a disagreement with her girlfriend, she did not expect her to resort to name calling. But she did and the mistress was not going to stomach it. She had to do something to make sure all future fights were fair and that is why she took her to the bathroom and she peed on her. She had to drink it all before she let her go.
This mistress knew that this guy troublesome and would not agree to do what she wanted unless she made him do it. So she did not hesitate to trample his face as painfully as she could with her bare feet. And when she was done, she made him drink her pee. The pain she had inflicted on him made him agree to do what she asked him despite how cruel and humiliating it was.