Mistress Nina asked her foot slave to give her his best foot lick but it was not up to her standard and she was pissed as it was literally a waste of her time. That is why she used her sweaty and smelly feet to dominate him. He was humiliated and when that was over, the mistress also financially humiliated the guy so that he would learn his lesson even better.
Mistress Kinsley loves to do crazy things and today was no exception. She wanted to unwind and have a good time but while she simultaneously humiliated this slave. She wanted to have fun at his expense and that is what she did. The mistress got him to lick her socks and endure choking using her feet. She had him eat her socks and endure further trampling with her bare feet.