Mistress Dula was not ok with this guy and she had to punish him. He had lied to her and he thought it was ok to do it and that did not sit well with her. So she had to ensure that she punished him for him never to do that again. That is why she had to cruelly slap the shit out of him and she made sure it was the cruelest slap he had ever received.
Mistress Dula was not impressed by the size of this guy's dick. She felt that he needed to do better and that is why she went out of her way to slap the shit out of him to make it happen. The guy had not thought that she was capable of doing so. It all caught him unawares and it was humiliating for him but there was nothing he could do about it.
When this guy spanked mistress Dula, he did not know that he would be made to pay for it. The mistress used her brutal faceslapping fetish to teach the guy a lesson that he had never been taught before. The mistress laughed at him as he was shocked and as he tried to beg her for mercy and promised that he would never do it again. She knew he would not.