Mistress Agma and mistress Jucy had to get info from this girl and they decided to humiliate it out of her. That is why they chose to trample as well as humiliate her using their feet and socks. The socks were stinky but she could not do anything about it. She was forced to lick them clean and she did it to avoid pissing them further. And she gave them all the info they sought.
Mistress Sofi wanted to tease this guy but also humiliate him at the same time. So she had him kneel in front of him as she sat on a chair. He stared directly at her crotch and he was drawn in by her hot legs, thighs and her camel toe. She took advantage of his desire to fuck her to make him lick her socks and thus humiliated him for her fun before she denied him the sex he wanted.
Queen Kira is the sort of person who loves to do nasty things to guys especially those who find her attractive but she does not feel the same way towards them. That is what happened in this instance. This guy was into her and he was even horny as they chatted. She slowly turned him into her socks slave as she made him lick her stinky socks and smell them.