Mistress Nyx loves to do degrading things and that is what she was up to today. She chose to use her giantess feet to crush as well as humiliate this guy because he had been a pain in the ass for her. The mistress stomped on him and she made him cry like a little baby as he felt the pain and as he was humiliated. He changed after that.
Mistress Nyx likes to humiliate people who piss her off and when this guy did, she had to teach him a lesson. That is why she chose to use her sexy giantess fetish to degrade the guy and make sure he learned never to mess with her. In addition, the mistress went out of her way to make the guy pee on himself as the pain of her smothering and trampling got to him.