Nicole and Kira came from a walk where their devoted slave girl christina was waiting for them. Their feet are very dirty because they walked barefoot in a street full of germs, dust and dirt. "Whore, you know what to do" - Nicole said to christina. Of course, christina understands what Nicole and Kira want from her and that their dirty feet won't become clean by themselves. She begins to polish their soles with her tongue. Her tongue quickly turns black with mud and the girls laugh at her and say how insignificant she is. christina doesn't give up, swallows all the dirt and continues to worship the girls' feet until they become clean.