This mistress was owed money by this girl. She had been more than patient and it was several months but she did not pay her and she did not look like she would pay her. So the mistress had to take matters into her own hands and punish her to get it back. That is why she turned her into an ass slave and had her eat her ass until she learned to pay back debts.
This mistress did not want her slave to be foul mouthed and so she punished him immediately she found out that he was foul mouthed. She did this as she wanted to nip the issue in the bud. So she smothered him as cruelly as she was able to and he felt the pain of her weight. He cried and begged her for mercy but she told him he was the cause of his own misery.