Draco's smile turned into a frown when she pulled the leash hard, making him grunt. Well, she certainly was enjoying being in control. At least he could sense that, though why he was licking her feet if it did little for her was a bit beyond him. Perhaps it was a test to see if he really and truly was going to give her control. In that case, he was going to pass this test with flying colors.
"Yes, Miss Greengrass," he said before he bent his head low and ran his tongue slowly along the shiny material of her shoes. Each movement was seductive as he lathered her shoes with attention, hoping that she would see that his talented tongue would be better used on some other place on her body.