"Now Muddy, as a benevolent mistress, I will teach you how to greet your superiors". Hermione found herself compelled to follow Narcissa’s directions, chasing the small dose of pleasure from her captor’s praise. It was much more desirable than the light stinging hex to her ass and thighs when she failed to grovel in a manner that pleased her mistress. The low-level pain always chased away the residual traces of gratification, ensuring that the student didn’t rest on her laurels.