The slave is for the moment done with his chores, but that doesnt mean Goddess Nikki permits him to go do whatever he wants. Instead she repurposes his face as a foot stool. For one it humiliates him by him to fill his lungs only with her foot scent filtered through her smelly athletic socks. But his face also conveniently acts as a foot warmer, keeping her delicate feet all comfortable and warm while she relaxes and watches TV.