Jon considered the possibilities. He could explain things to Kevin. But there was no way he could be believed.... No, of course there was. Just make a wish for it. The stone could do at least that much. "Kevin," he said, "I wish you'd listen to me and believe the story I'm going to tell you."
"Uh, okay?" replied Kevin.
"I'm a guy but I turned myself into a girl by mistake. Then I wasn't thinking and I sent the transformation onto you instead."
"Really? That's..." Kevin couldn't bring herself to say "impossible". She couldn't even think that it was impossible. "I know I'm a girl. I've always been a girl even if you guys think I'm not. But you sound like you're telling the truth."
"It is the truth," said Jon. "You were a guy, but after the magic, you're a girl and everyone remembers that you're a girl. Except maybe the people back home."
"I don't remember any of that, Jon. All I know is that I love you but if everyone knows me as a boy it can never be. I don't even know how to act like a girl. But from what you're saying I shouldn't--even remembering anything at all as a girl isn't the truth. I have memories that are gone now."
"Do you want me to try to change you back, Kevin? I can't tell you how I'm doing it, but believe me it's possible. Well, I'm not sure if I can just make things exactly as they were before, but I can try."
"I don't want to lose the memories I have now but if it's all not real... oh, please help me, Jon, this is so tough."
"Okay, then. Tell me what you think I should do to fix you. Given that I can't change you into a guy."
"I've lived as a boy, so how about this... everyone knows I'm a girl, and I can wear bras instead of binding my breasts, but I still wear guy things and do guy things and people accept me as if I was one of the guys. That will make my life as much like it is now as possible. I keep all my real memories of things that really happened, so I remember my real life as a guy, then I remember being changed and I remember having this conversation with you. And if I'm not in love with you when I change back I'm going to fall in love with you and we'll start dating."
"Are you sure about all of that?" asked Jon.
"Of course I'm not sure," said Kevin. "Do it before I change my mind. If you really caused all of this it's all crazy and you should do anything I ask."
"Fine. I wish for all of that."
Kevin was suddenly standing up again. She didn't stand up--she was just suddenly in a standing position. In the reality where she had been a known girl, she apparently hadn't been crying. She looked the same, like Kevin with breasts, the same hair and clothes, just with slight tweaks to his body shape to make it obvious "he" was a girl.
"You jerk!" said Kevin.
"What?" replied Jon. "I did the best I could. You remember being Kevin up until you really changed, and you remember really being changed. I couldn't change you back so I did the best I could. Your life is mostly like what it was when you were a guy because everyone treats you as one of the guys. I'm surprised you even asked for this--I'm sure you were going to ask to keep memories of your whole life as a girl and I'd have to argue you out of keeping fake memories."
"We're going to be dating. And I'm a guy."
"I was giving you what you asked for. Maybe I shouldn't have but it's not as if I'm going to force you to do it. Besides, I don't have a girlfriend, unless it's Megan, and that's not real, that's fake memories. Do you want me to try to fix it again, or should I leave it like this?"