Mistress Rosella and her friend mistress Barbara wanted to teach their professor a lesson. He had given them low marks because they did not want to sleep with him. They were pissed off and had to do something about it. The mistresses lured him to a house where he thought he would finally get what he wanted but was surprised when they turned on him and forced him to lick and drink their pee and lick and smell their asses. He corrected their grades.