Peter began to feel something stirring in his groin, and his underwear felt like it was getting tighter. But he didn't feel like he was getting hard. The feeling was strange and unexpected.
Then he looked up and stared glanced at the other students. That’s when he noticed that Lisa, the girl who was sitting next to him, was staring at him quite often. She would look at him with a smirk on her face, and then she would look at the teacher whenever peter stared in her direction.
It started again! Peter felt that odd sensation in his groin once again. Once again, his underwear felt noticeably tighter. Was it shrinking? He looked down curiously. His jeans didn't *seem* that different on the outside...
Peter looked up once again. Lisa had a wide grin on her face. Peter didn’t realize that she liked him. Either way, she noticed that she could imagine Peter changing, and whatever she imagined would also happen to him! Peter’s heart was pounding. His classmates began to find out, that they could easily shrink or grow any part of his body, by simply imagining what part of him would need to change in size. Somehow, he became aware of the fact that he would feel a lot of changes coming his way.
As if to echo the thoughts, his underwear suddenly felt tighter again. However, this time Peter was watching his groin and actually saw the front of his jeans jump out a bit, bulging ever so slightly. His eyes widened a little and he glanced around. No one else had seen the growth. Lisa was smiling, but facing forward. Peter paid her very little attention.
Again! He looked down and saw that his jeans were now noticeably bulging outwards. Raising his hand, Peter requested a hall pass. Thankfully, the teacher allowed it, and Peter moved to get up.
As Peter got up, he could feel a new weight in his groin. His jeans were clearly bulging out, but he tried to walk quickly out of the room. Lisa grinned wide as he left, but he didn't see it...
Once he got to the bathroom, Peter cautiously unzipped his fly. His underwear was bulging hugely, but something was off. Carefully, Peter removed his underwear and immediately saw the issue. His cock hadn't grown at all, it was the same size it had always been. But Peter's balls had swollen up from the size of ping pong balls to the size of tennis balls.
As he watched, he felt the sensation again and he actually saw them swell and droop a bit more, coming close to the size of apples. Pulling his underwear back on, Peter winced slightly. His underwear was stretched to the maximum trying to contain his enormous balls. He did have to admit though, the bulge looked fantastic. It even showed through his jeans, there was now a sizeable mound in front. Peter barely managed to zip up his fly and he left with his new monster bulge to go back to class.