Mistress Sofi had had sex with this guy but he was pretty useless and she did not like it. She had to make sure that he never disappointed anyone else the way he had done with her. That is why she chose to brush her teeth and spit into his mouth. He did not have a choice but to do what she wanted. It was degrading but he did not have a choice.
Mistress Kira did not feel for this guy the way he felt for her and she knew that the best way to do so was to humiliate him like never before. The mistress made him a spit slave and as she degraded him, he knew that he had to follow her instructions if he was to avoid such humiliation again. She did not have to spell it out for him.
These two mistresses wanted to dominate this loser and that is what they did. The mistresses used their saliva to degrade and humiliate this loser and he had no choice or say in the matter. He had not even done anything to warrant the punishment he received. The mistresses cruelly stripped him naked and they forced him to open his mouth and they spat into it without caring what he felt.