This mistress felt that she had a slave who was not easy to tame so she had to punish him in a way that he had never been tamed before. So she took a strapon and she used it to fuck him in the ass. She made sure that it was as painful as she wanted it to be and that he learned from all the pain that he felt.
When this guy stole from this mistress, he did not think he could get caught but he did. And the mistress did not care that he felt as she took a dildo and she used it to fuck him in the ass. She did not even bother to use lube as she punished and cruelly tortured him. That is why she made sure she punished him in a sound proof place.
When this guy could not pay back the debt that he had, the mistress felt that it was useless to keep on asking him for money to pay. She felt that the best way for her to deal with him was to use her strapon to fuck him in the ass as she had always wanted to try it. And she did so. When she was done, she told him to consider the debt fully paid.