Mistress Katja's slave was forgetful and she wanted to make sure that he did something about it. She did not want to remind him about everything so she trampled him and made him lick her dirty shoes and socks to give him the motivation to remember things. The punishment was humiliating and forced to write things down so as to remember them better. He never forgot anything after the punishment.
Mistress Katja and her friend Lena have a nice POV for you so you can imagine being their foot slave. They look at you as you kneel before them and they know that you are turned on and have a foot fetish. They take their high heels off and shove them in your face. They want you to sniff their shoes and lick them until you polish off all the dirt with your tongue.