Jon wondered how him having breasts was explained away. Boys don't have breasts, obviously. So, he used the stone to find out. About a year ago, Jon had breast implants surgically placed in his chest. His wish also explained to him that he had a desire to become a woman someday and the breast implants were sort of the first step in that plan.
Jon uneasily wondered what the next step was, so he made a wish to find out. He was shocked to learn that he had an appointment scheduled in two weeks for his sex change operation. He didn't want a sex change!