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Over time she was able to add a fourth weight, and then a fifth to his sack. She told him that her first goal was to make it so that his nuts could no longer retract on their own, and she said this would take a few months of dedicated hanging. She knew because she'd done it already to her father. And indeed after four months of stretching and abuse his nuts no longer retracted under any circumstance. And they were getting huge. Even during class, with his pants on, she could see how bulging his nutsack was now. Everyone could see it. And again, it was both embarrassing but also a little exciting that these kids could take stock of the increased size and shape of his nuts. With the scrotal muscles now damaged, Lacy had her teacher stop wearing them and instead told him to order an acrylic nut-press. This was hard to do since his balls had swollen so large, but he finally found one on a fetish site that was big enough, and Lacy instructed him to wear it every night when he came home, and to stay naked until bedtime.
On one day, she told him to bring in the vice and show him how he was using it. It was after school was over, as always, and the door was locked, as always, and there was Mr. Robinson, as always, naked from the waist down, and Lacy fitting the press over his balls and was screwing it down. However, it was evident that he wasn't trying very hard to screw his own nuts down, and so she decided to punish him for not trying hard enough. She kept screwing the press down until Will broke out in a cold sweat, he was afraid for his balls, it was that tight. It felt like either of them would rupture and second, but Lacy just wasn't strong enough to tighten them that much. She sure made them hurt though, and William wretched again, on the floor. Lacy told him that if he didn't tighten them as much as that each night she would destroy one of his testicles as punishment, and William could tell by the tone of her voice that she meant it. Part of his brain was horrified at the thought of loosing part of his manhood, but a more basic, primitive part of his brain was curious as to what it would feel like and what taking his nut would mean to Lacy. Would she enjoy it? Would he?
Placating her, he promised he would do as she instructed, every night, and that she would see results from it after class each day when she showed up to give him his normal work-over. At this point she was first kicking, then hitting, and then squeezing his big rubbery glands. They were swelling with fluid and hanging down at least halfway to his knees. It was wonderful, for Lacy at least. But there was a complication - it was summer break, and she no longer saw him every day at class. So instead she made her father drive her across town to his place, and he then had to endure hours of testicle torture and ball busting at her hands (and feet). 
At one point she told him to buy some home-torture devices that used electricity, and when it was hooked up, she plunged needles right into the heart of each testicle and turned on the juice. William Robinson's screams filled the air as the current arced between his nuts and fried them.