Mistress Tess does love a pair of balls that She can hurt. She loves slaves that make the mistake of buying Her truly sadistic gifts, setting up their own demise. This slave is one of those guys. He thought it would be a great idea to get this nasty little device for Her to use on him. As you'll see, once it's locked on and She starts screwing in all of the little screws that dig in to his balls he realises that this perhaps wasn't such a great gift!