This mistress needed a slave who knew how to lick. That was important to her as she wanted her feet to be licked and she knew she would want other parts of her body licked from time to time. So she foot gagged her and she had her learn to do what she wanted and that is how the slave learned to lick the way the mistress wanted it done.
This trans girl messed with this mistress and did not think much about it until the mistress reacted. The girl did not expect what the mistress did to her. The mistress stripped her naked and she trampled him from his face down. She would jump on her and stomp her as well as pinch her nipples. All of this was geared towards making the trans girl learn to respect other people.