What follows between the two?

Jon wants to help

Jon, once again alone in his room, bent and picked up the wishing rock. He still couldn't believe the power the item had. Having watched Karyn, his best friend, transform into a large breasted blonde right in front of him had shaken him, knowing full well how wishes were irreversible. There was no way that Karyn had wanted to change how she looked so dramatically. Sure, everybody wanted to change a little bit, who was perfectly satisfied with themselves? But to see such a huge change because of an idly spoken, accidental wish, it made Jon respect the rock more than he did before.

Down the hall, Jon could hear Karyn in the washroom, obviously unhappy. Jon had known Karyn for a long time, but he'd never heard her weep as she was now. He wanted to make her feel better, and he knew that he had the power in his hand to do it, but the power was so unpredictable. What if what he wished for backfired? What if it had unintended consequences?

Gripping the wishing rock tightly, Jon decided that he had to try. Formulating his wish in his mind, he said, "I wish..."