"Wait a minute, Karyn."
"What?"
"I'm not as enthusiastic about touring this city as you are. All I really want is to be human again. Better now than later."
"Well, if you want."
"Yes. It's what I want."
"Okay, then." Karyn held the stone in her metal hand and said "I wish for me and Jon to travel through time back to the time when we originally left."
The city dropped down all around them, first becoming low-rise buildings, and then becoming small two to three story buildings, and then becoming houses. They were back in their neighborhood again. So, in a couple hundred years, their hometown would become that futuristic city.
Jon watched as Karyn's hair turned back from being a yellow-painted lump of metal vaguely looking like hair, into actual blonde hair. Her skin got pinker, and paint on her skin thickened and expanded until it became like cloth... and then it was cloth, and Karyn was standing there, human again.
As per the wish, they'd become human if they left that city, including by time travel... but as Jon had figured, things weren't back to normal. On his chest were two weights, pushed against his chest by something. Breasts in a bra. His crotch felt strangely empty--no longer the complete lack of feeling he had as a robot, but nowhere near what he was used to.
"I'm a girl!" he yelled.
"Yeah," said Karyn. "You wouldn't look half bad with long hair and some makeup," said Karyn. "At least you're human."
"But I'm a girl!"
"I've been a girl all my life," said Karyn. "Maybe you should get used to it until you figure out how to reverse the wish."
"I wished I'd look more like you, and I knew it'd make me a girl as soon as I was human...."
"Why don't you wish to be a guy who looks more like me?"
"What if that made me a she-male? Or what if it made me your brother? I'm sick and tired of wish problems. I just know I'll mess up more. But if I just put the stone away now and give up on wishes until later, I'm a girl. What do I do? Help!"