Princess Nikki does not like students who do not understand anything in class. She was convinced that this student was not applying himself in class and it was not because he was stupid, but rather because he did not want to try. So she made him increase his effort by humiliating him and peeing on him. She forced him to drink her pee and told him she would punish and humiliate him till he doubled and tripled his effort.
Mistress Tina is a mistress who does not care. She is also cruel and when she wants to punish or get back at someone, she goes the extra mile to make sure it is worthwhile. She wanted to humiliate and torture this loser so she forced her to lie naked and she pissed on her. Tina also called her boyfriend to also piss on the loser and they all did it outdoors.