Goddess Nika felt that she had to try something she had never tried before. That is why she went out of her way to degrade this loser using her spit fetish. The mistress used spit to make this loser follow her instructions. He had to do whatever it is that she wanted and by the time she was done with him, he had realized that he had to obey her at all times.
Goddess Nika realized that she was dealing with a guy who was not doing what he was supposed to be doing and so she used her saliva to punish him. He was an abusive piece of shit who needed to be tamed and so she did it on behalf of his victims. The mistress had fun forcing him to drink her saliva and that is how he learned never to be abusive again.
Goddess Nika did not want anything to wrong with her project so she humiliated his loser to send a message. She used her spit fetish to dominate and humiliate him for fun. She got the poor guy to lick her saliva and to swallow it as well before she felt it was enough. She warned him not to mess up on her project as she would cruelly teach him a lesson.
Goddess Nika loves spit. She loves it because she uses it as a tool for punishment and humiliation. It is a simple and effortless way for her to punish and that is why she loves it. She made this loser swallow her spit when he pissed her off. The guy was rude to goddess Nika but the saliva made him learn his lesson and promise never do it again.