Mistress Domi and mistress Lucie wanted this guy to pull up his socks. He was unreliable and that was not ok with them. He had to change for the better and be more reliable. That is why the mistresses chose to degrade him with their spit to send him a warning that it would not be business as usual and that he had to be reliable sooner rather than later.
Mistress Mini and mistress Nikki wanted to have fun at this guy's expense. So they flirted with him and he fell for it. The guy was made to admire their firm and sexy boobs. He loved what he saw and he wanted to touch them but he was not allowed to. Instead, the mistresses spat on him and lie to him that it turned them on when someone licked their saliva.
This loser did not know his place and these mistresses felt that she needed to do something about it. The mistresses used saliva to teach him a lesson and it was a lesson he did not have a choice but to learn. He was forced to open his mouth and the mistresses spat into it. He tried to refuse but he was told that there was a worse one waiting for him so he complied.