Goddess Kiffa felt that she had to degrade this guy because he had been a nuisance to her. She was not going to let him get away with what he had done. And that is why she had to spit on him and force him to do other humiliating things while he was naked. To make it worse, the mistress went ahead to record him and to make him lick her soles.
Goddess Kiffa wanted to make sure that she taught her boyfriend a lesson and she did it by forcing him to lick her spit. She brushed her teeth and she spat on him. He was humiliated by what she did to him but he realized that she was dead serious and he had to find a way to change and make her stop trying to humiliate and punish him cruelly.