Mistress Harley wanted to humiliate this guy but she did not make it obvious. She showed him her hot ass. Her big ass and her big tits. He loved them and he wanted them. But she told him he could not satisfy her as he had a small dick. She told him this after she had made him undress. It was humiliating for the guy and he ran away from her.
Princess Serena wanted to blackmail this guy because she felt that he deserved it. He had a bad attitude and he looked down on others. So she used the fact that he had a small dick to blackmail him. He did not see it coming but she used it to dominate him and especially do it financially. He learned to stop looking down on others and to have a bad attitude.