Christina was awarded for her good service and the girls gave her a slave girl anna for a couple of hours. She has suffered enough humiliation and she wants to show anna her place. Christina orders anna to lick her sneakers and anna doesnt seem to like it .. because her face looks pathetic, as always. But this only encourages chrisitna and she tells anna to take off her sneakers and sniff them from the inside. Also, anna shouldnt forget about Christinas socks .. anna must humiliate herself in front of Christina and of course she doesnt like it. She is used to serving beautiful girls, they are higher in status, and serving Christina is a double humiliation .. but there is no choice. An order is an order. And so she kneels in front of Christina, opens her mouth and worships Christinas sweaty feet.