This guy procrastinated like crazy and this mistress was not happy about it. She felt that she had given him enough time to do something about it and since he was not making any positive steps to deal with the issue, she had to get involved and change him. So she trampled him and made sure to trample his balls as well and that is when he learned his lesson and changed.
Lady Aalya loves to put on her sexy boots and trample her slave. He is a loser in her eyes, so trampling him and using all of her weight makes her feel very powerful. She will walk all over his body and even make sure he gets the most amount of pain she can deliver. Full body weight trampling is a very painful action to endure.