Lady Krasaviza wanted to make sure that her slave was taught a lesson. She hates slaves who are not well behaved and this one was not. She humiliated by making him eat her feet's dead skin. She scrubbed it off her feet and she fed it to him. She made him watch what she was doing before she made him eat it. That way, he was double humiliated and it was more fun.
Lady Krasaviza's feet get sweaty a lot but she never worries about that since she has a slave. If she is wearing her socks, she makes her slave smell them or chew them and then wash them. But if like today it is just her bare feet which are sweaty, she uses her slave as a sweat remover and has him lick her feet till they are clean before letting him go.