Lady Scarlet and her friend were conned by these guys and they did not take it personal. They accepted that they had been conned but they wanted it to end with them. That is why they hunted the guys down and they dominated them cruelly. They double dominated the guys and had them suck each other's dicks and fuck each other in the mouth even though the guys were straight.
When this guy was late, he did not think that it would be a big deal but it was. He had to be dealt with so that he did not make it a habit. The mistresses chose to do it with their trampling so they double dominated him and made sure that he was in a lot of pain and that he regretted what he had done to deserve the punishment.
This guy was too miserly for these mistresses and they plotted to do something to him to make him learn his lesson and stop being a miser. So the mistresses promised him fun and he was over the moon but he was shocked when it turned out to be domination and torture. He was stripped naked and tied before they cruelly pinched his nipples and dominated him like never before.
Lady Scarlet and her friend dealt with this guy in a honest manner but he had some hidden cards and the mistresses later found out that he was not being honest with them. The mistresses had to make sure he learned his lesson the hard way so that he would never do it again. And that is why they chose to crush his head after luring him to their house.