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"Three should do it for now," she said as she locked them into position. "I want you to wear them day and night and I'll keep the key. They will weight your balls down from above and make your scrotum bigger, which is what I want. I like to see balls dangling just like yours are doing now. Now KNEEL!" she bellowed. William knew this was going to hurt but he knew he'd get it worse if he disobeyed. So down he sank to his knees. His naked kneecaps hurt on the hard classroom floor, but what hurt more was Lacy's shoe smashing into his balls. Over and over and over. Lacy told him to put his hands on his head and away from his balls, and she slapped him in the face again when he didn't instantly comply. Soon his testicles were swelling from all the abuse but also being stretched by the weights, but his dick? Well it was issuing copious amounts of pearly precum. This was both embarrassing and exiting to William. He'd never had any female, of any age make him feel this way. It was like he was in the thrall of some greater force, some greater will than his own. This little girl kicking him the ghoolies was going to be a monster when she grew up. She was a monster now, and it thrilled him. He'd taught children for years and only now did he realized he'd always harbored a secret desire to be dominated by one of them. Thankfully it was a girl and a pretty one at that, with blue eyes, a pert pink mouth, and curly blond hair. She'd be a stunner as a teenager as well as a monster.
Finally Mr. Robinson keeled over and wretched on the floor, and Lacy thought he'd had enough excitement for one day. She groped his bulging testicles to see how big they had gotten. It was her goal not only to stretch his balls but also to make them as big as possible. It was just like with her dad. She liked low, big hangers. Before leaving, and while he was clutching himself, she slapped his raging boner around a little. She even fingered his oozing slit and tasted his precum. It was sweet and musky, kind of nice to be honest. Then she left him there, a moaning heap, and left for the day.
Over the next few weeks Lacy trapped her teacher at the end of the day and monitored the swelling of his agates and the stretching of the bag they rolled around in. As time went on Mr. Robinson became increasing compliant, and let her do things to him that even her father had been reticent about. She had William sit naked on the corner of his desk and smashed his nuts into the hard wooden surface with a wooden ruler. That hurt so bad. 
And one day Lacy brought in some needles and a cigarette lighter. With some twine she tied him down to the chair, naked with his legs open and his weighted nuts vulnerable, and then heated the needles and slid them into his nuts. She could actually hear the red-hot needle bubbling and cooking the inside of his nads. It was super cool (or rather super hot), and Mr. Robinson bit is tongue to keep from yelling out, just in case another teacher or student should be in the room next door.