When this mistress realized that this guy was messing with her, she chose to show him who she is. She did not want him to take advantage of her anymore so she choked him with her bare hands. He was shocked at how strong she was as he did not expect her to be that strong. She looked sweet and innocent and that is why he took her for granted.
Mistress Damaris and Mistress Camil wanted to see how macho this guy was. They are hot mistress and kinky as well and they know it was a steal for this guy to screw them both. But they had to make him pay for it and give him incentive to make it worth their while. They used their hands to choke him and strangle him and make him hold on as much as he could. They left him with red marks all over his neck but they made him all worth it when they screwed him.