Punishment For Unfulfilled Slave Duty

This calls for penalty! This stupid slave hasnt correctly understood his task. He was supposed to slurp all of Princess Serenas footwear completely clean. There shouldnt be a stain on her boots afterwards, but it seems he has overlooked something. Princess Serena has noticed, of course, because she notices everything. Her boots are still dirty! The slave will now have to be punished. She strikes his back and ass firmly with a crop, landint it with a loud crack! Thats the way it should be because a useless slave deserves nothing else!