When her boyfriend pissed her off, she had to teach him a lesson so that he learned never to piss her off again. The mistress used her spit to degrade him. He was made to lick her spit and to smear some of it on his face before the mistress felt that the message was home and that he would not repeat what he had done. She managed to change him.
Goddess Alaine was kicking it with this guy but he was not good company. In fact, she had never been as bored as she wanted. So the mistress used her saliva to dominate and humiliate him. The mistress shocked the guy by forcing him to lick it all and learn never to be boring again if he wanted to avoid such humiliation and domination in the future. He learned his lesson.
Since he was not very good at doing what they wanted him to do, mistress Nica and mistress Kristin chose to use their slave as a human ashtray. He was forced to lick their saliva as well as to do all other humiliating things they felt like doing to him. And it was fun for them but it was torture for him. He did not need to be told he had to be hardworking.