"I wish you would grow up!" said Karen. Jon tried to grab the stone out of her hand before she could finish speaking, but he was too slow.
Suddenly, Jon gasped as he felt a strange, constricting feeling in his crotch. He looked down and saw a huge bulge straining in his pants. His cock and balls felt like they were being crushed in a vise. Jon fell over in pain, struggling to undo his pants and release the pressure.
Karen, meanwhile, was grabbing a sheet off of Jon's bed to try to cover herself up. She looked back at Jon when she heard him fall down.
"Jon, are you okay?" she asked.
Jon didn't respond, as all he could do was moan in pain. Karen said "I wish I knew what just happened..."
As soon as she had said the words, Jon's clothes vanished. Jon let out a huge sigh of relief as the crushing pain suddenly went away. Karen gasped at what she saw.
Jon was lying on the floor with a huge, flaccid cock and balls between his legs. She grabbed his arm and helped him to stand up. Jon's penis dangled down to his knees, and was thicker around than his arm. His balls were bigger than softballs, and he had to stand with his knees spread wide to avoid squeezing them between his legs.
"Oh my God, Jon, what happened?" said Karen. "I wish..."