It's luxury to have such a stupid and submissive slave, who only waits to lick the shoes of his mistress clean when she comes back from work or a walk. And she gives him what he deserves- every time she walks home she takes the muddiest route to collect the dirt from the streets beneath her shoes and then feed her slave. What a pitiful dog... his face is dirty all over from her boots, but he licks like a stupid pig.
Mercedes wants to humiliate her slave today. He is lying on the floor and she is sitting in a chair. Her boots are very dirty and she wants her slave to clean them. She puts her shoe in his mouth and he licks it. Later on she spits on the sole of her boot and wants him to lick all the dirt and her spit off. She enjoys it !