This mistress loves fast people and when she noticed that the guys she had gotten for the job were slow, she knew there would be a lot of problems. That is why she chose to dominate him and do it in a manner they would never forget. She double dominated them and double humiliated them. They were in pain and they were humiliated but they realized she was not messing around.
This colleague was misogynistic and mistresses Domi and Lola were not going to allow him to get away with it. So they did what they had to do and they dominated him as cruelly as he needed to be dominated so that he would change. He was forced to lick their boots and to do other humiliating things so that he would realize there was a new sheriff in town.