Winky brought a looking bludger device into her prisoner’s eye-line. The silver sphere glinted benignly, in the Elf’s hand. After seeing the two Elves it took to wield her gag, the unknown ball seemed a little less intimidating. She could hear Winky’s progress down the ladder until she felt her trainer give a little tug on her tubed clit. "Pay attention Muddy, I will say this only once", she felt the smooth ball being rubbed on her slit, the tinkle of metal sphere on metal labial clamp as the ball was moved into her sex, so deep it almost touched her cervix. "This training is to teach your hungry cunt to contract every time you cum. If you are given the gift of an orgasm you must bear down automatically". Hermione could only concentrate on the small hands shoving the item deep into her dripping hole, she had no way to stopping this or pleading against this continued insanity. "So Muddy, clamp down on it, that’s right hold it... or I will make you so sorry". With the threat ringing in her ears, Hermione felt the small hands leave her wet folds. It was humiliating but she was relieved despite the cold heavy nature of the sphere she was managing, so far, to retain it. "Ok, now let’s see if you can keep holding it in while you are stimulated". Hermione hadn’t expected to feel her love button being engulfed by a wet concoction, the tube bathing the exposed flesh making her clit feel simultaneous itchy and tender. She felt a frisson of pleasure when a vibrator tinkled against her glass-caged clit. The surprise caused her to lose contact with the silver ball, she heard rather than felt it sliding out as it was momentarily caught on the pussy clamps before thudding ominously to the floor.