Without hesitation she stepped forward between his legs and placed both of her bare feet on his swollen glands. They were so big, that Lisa almost lost her balance. She stepped back grabbed his feet, and bending his legs at the knees lifted his feet up behind his ass. Using them to balance her self she again placed her feet on his baby makers. Lisa held them in place with her toes and began to shift her weight forward.

Planning to gradually apply weight, she accidentally lost her balance and squished them flat into the mat. Dan Moaned but couldn’t move or intelligently speak words of protest. Lisa regained her balance, but liked the feeling, so she began to rock forward and back, pumping his nut meat with her weight.

She had been concentrating so much on keeping every attack in their workout, that she was surprised at how sexually stimulated she had become. Her panties were soaked through, and she was breathing way too erratically to have been caused by the physical exertion. While rolling him onto his back seemed like a good idea, she decided to head for the lockers and take care of her own needs first - allowing Dan to recover.

In the locker room she stripped on one of the wooden benches, but couldn’t wait to get into the water before she was wildly stoking her clitoris, head back mouth agape, envisioning his dark and ever so swollen nuts completely filling his painfully stretched scrotum. Orgasm after orgasm swept through her body, until she felt a slight cramp in her right thigh. Wow, that hadn’t happened since high school.

After cleaning herself, dressing in street clothes and returning to the sparring room; she found Dan still laying on the floor in a semi fetal position. She used the progress form on the clip board to document his progress, and again measured the length, width and circumference of his wounded manhood.

While she was inspecting his bruised balls for any signs of rupture, his erection came back with a vengeance. He was trying to rub his cock against her hands, thighs against anything. Lisa obviously understood his needs, but needed to keep this professional, so she had to word her statement correctly, “Your testicles feel very taunt, almost ready to burst” she began.

Dan thought, “Ready to burst in more ways than one!!”.

Lisa wrapped her left hand around his erection and began to slowly stroke his cock from it’s base to his throbbing mushroom shaped head. Keeping her right hand cupping and massaging his balls, she suggested, “We should relieve some of the pressure to prevent internal injury”.

Dan couldn’t agree more, as he instinctively pushed his hips against her stroking hand. He tensed his whole body less than a minute later and shot a wad of cum which streamed more than a foot into the air. Spraying his stomach, the mat and Lisa’s hand with a thin watery mixture of semen, blood, and clear edema fluid from his swollen nuts. He experienced both ecstasy from the long built up orgasm, and agony from the pulsing in his damages orbs. He wailed like a child.

Lisa kept stroking him until long after the last drops dribbled out, and his manhood had gone limp. Never before had she felt so moved watching a man cum, and she felt completely responsible for both his torment and his release. She owned his balls, they were hers to command, and she felt powerful!

She grabbed a gym towel and mopped up his mess, taking time to wipe his privates of any sign of blood. Then assisting him to his feet, she handed him his clothes and turned him towards the men’s locker room. It was only after he left, that she took the time to compare the results of her measurements. His balls were more than triple their original size! From the average size of a medium chicken’s egg to the size of an orange. Wednesday they were more like lemons, Unbelievable! She couldn’t wait for Monday’s lesson.

As they were leaving the building Dan invited Lisa to dinner. His voice was weak, and his confidence low unsure if he could even eat right now. But she was enthusiastic, hell it was Friday night, and he was bound to offer her something better than a microwave instant dinner.

Dan chose a quiet family owned Italian place, where their casual attire wouldn’t make them feel out of place. Over dinner they learned more about each other, and became closer then either one thought possible after such a short time.

Lisa explained how she got started in the martial arts, and how she never expected to end up working at a gym, especially with her college degrees. It just seemed to work out that way.

Dan confessed that the men in his family had a history of heart ailments and he was directed by his physician to keep up an intensive cardiovascular program. He chose the martial arts for the additional benefit of self-defense. He thanked her for her private lessons and personal attention.

“No Dan, really, it’s my pleasure”, she said thinking how he had no idea how hot she got working his balls over. She mentioned the swelling, and how she hadn’t expected his testicles to expand that dramatically.

He didn’t know what to expect either, but “she was the professional, he’d leave it in her hands”.

‘In my hands’, Lisa thought, ‘three times a week they will be in my hands’. She smiled shyly and realized she was getting excited again just at the thought of pounding his meat. She had wanted to do this since she began studying the arts, and she certainly intended to enjoy it as long as she could make it last.