"What?" said Karyn. "That sucks. You know, when you wished to be a boy and a girl, you never said anything about living six feet apart, so you can change that, right?"
"Yeah. You know, I..." said Jon.
"...didn't think of that," said Jen.
"And you should do something about those sentences too. You just switched from sixty word sentences to five word sentences. What's up with that? Lemme borrow the stone, okay? I don't know what it would do when each of you guys makes half a wish sentence."
Jen tossed the stone over to Karyn, who made her wish. "I wish that Jon and Jen can stay apart from each other, talk separately, and think separately just like normal twins can. I wish that they are two people, each with their own copy of Jon's mind, not one mind in two bodies or anything like that."
Jon and Jen looked away from the stone and at each other. Then it was done.
"Okay," said Jon. "That was weird. I don't understand what happened. First I'm me. Then I'm a girl and me. Then I'm two people and suddenly I'm not me. I'm thinking in a half-girl way, so I wanted to wear a skirt, when I didn't even when I was a full girl."
Jen saw that Jon had stopped, and said, "It's the same for me. I'm me, then a girl me, just like... Jon... says. Then I'm thinking half and half, and with this wish I'm me again. What happened?"
"I don't know," said Karyn. "Maybe since you didn't say no change in personality, the stone got to decide that for itself. But something else was strange."
"Hm?" said Jon.
"The room across changed from a storage room to Zoe's room. Why would that happen if you're living together and the rooms didn't need to change? What happened to Zoe's old room?"
"I think," said Jon, "that we had to use a different room as the storage room because with two of us there was more stuff to store."
Jen looked around the room. She looked slightly worried, or maybe, nervous.
"Is something wrong?" wondered Jon. "We can swap in a week, you know."
"Yeah, I know," said Jen. "I'm worried about now. Look, now that we're two people there aren't any girls' clothes in this room. Which means that now I have all the girls' clothes. And I'm still you. Not in a saying the same sentences sort of way, but... I don't want to wear skirts or makeup or anything like that any more than you would."
"I'm sorry," said Karyn, handing the stone back to Jen. "I wasn't thinking when I changed you into a girl in the first place! Look, why don't you make some more wishes. You could wish to change your history, you don't need to have a closet full of skirts if you don't want to."
"I'll cross that bridge when I come to it," said Jen. "Let's go see my room. For all I know in this reality I hate skirts anyway."
As they checked the room across the hall--which was indeed Jen's room now (maybe they had an extra storage room built somewhere), Jen remarked, "You know, just me being two normal people can be quite a lot of trouble on its own. There's no reason for the stone to add any extra weirdness to that."