Holding the stone in his hands, Chad yelled "Stop fighting, people!" Then he said "I wish you two liked having each other's body."
The stone glowed, granting his wish, and suddenly Kathy didn't seem angry anymore. Oddly, she was stroking her exposed cock (Jon's cock) and smiling at Jon. He looked down and realized that his (Kathy's) top was up enough to expose his bra-encased breasts. Kathy was actually getting off on seeing her own body.
Jon would have been weirded out by that if it weren't for the fact that he was kind of feeling the same way. About her. He looked at his body (now inhabited by Kathy), more specifically what was between her legs, and liked what he saw. He was actually attracted to his old body! And he knew why. It was Chad's wish. He made it so that Jon liked being female. He made it so that Jon wanted to be female, but more specifically, he made it so that Jon wanted to be in Kathy's body. And being attracted to males was part of what being a heterosexual female (like Kathy) was all about. Chad's wish also forced Kathy to like being male and actually want to be male (specifically, Jon). So while Jon was now definitely attracted to his old body, Kathy was also attracted to her old body.
It was very strange, but it all felt so right.