Fortunately for Jon, he didn't have long to wait to get the stone back, because Karyn brought it over to his house the next morning before school.
Once he got it back, he immediately made the wish he had been thinking of all night. Feeling a little embarrassed by it, however, he decided to make his wish out of earshot of Karyn. He didn't want her to know about his fetish. So after heading into another room alone, he held the stone and said "I wish ..."
