Lady Stefanie wanted to send a message to her boyfriend because she knew that he did not know how to eat her out. And that is why she had to make sure he was taught so that he did not have to suffer seeing her fucked by another man. So the mistress invited a girl and she had the girl eat her out and asked her boyfriend to take lessons.
Lady Stefanie wanted this loser to gain respect for her so she cuckolded. She knew if she did anything short of that, he would not understand her and respect her. So she turned him into a cuck by making him lick another man's cum from a used condom. In addition, she got the guy to lick her pussy discharge. He was humiliated but he deserved it and learned to respect her.