Madam Mysteria wanted to head trample this guy because she felt that she needed to have some sense in him. She crushed him painfully with her bare feet and she told him that he was lucky she did not choose to use her high heels. He cried but she did not care about any of his cries. All she wanted was to ensure he leaned his lesson and he did.
Madam Mysteria is not fat but she is not petite. She is big enough that her full weight is going to crush her slave when she jumps on him. She comes crashing down on him crushing his chest and trampling him. She does this a total of ten times and the slave can't take any more punishment. His punishment will be over when his mistress says it is and not a minute sooner.