Jon suddenly appeared onboard a plane, and then the stone vanished--no doubt it went back home.
He examined himself and his surroundings. He was "Julie" now. He had been talking in Julie's voice, of course, but he finally got a moment to really check himself out. His face, reflected in the plane window, was something like his own, but it was a girl's; his hair a shade lighter and his eyebrows a bit more like his mothers. He put a hand to his--no, her--chest and felt something soft--not just his breasts, but the bra covering them.
Around the plane there were a couple of empty seats, but nobody noticed that a new person had suddenly occupied one of them. Of course, wishes changed reality. Having a thought, he checked his pocket and found the remains of an airplane ticket.
All nonexistent. There was no plane ticket, no seat, and certainly no Julie. Just the stone, warping reality as if Julie existed, but not creating her since she'd have been outside the area.
She spent her time reading the diary, and then put it in her purse--which was also something she needed to look at, since as her nonexistent sister she would have to be familiar with it. She found a wallet with a few bills, a drivers license, and some other items; some makeup (better wish to learn how to use that), a receipt for a cheeseburger, lipstick, and several random objects. She held the makeup and thought about it--did she really want to learn to put on makeup just for the sake of papering over a wish? Not really, but there were two problems. First, the stone wasn't with her so she'd at least have to survive the trip home. Second, the fact that the stone could do such extreme things as create a fake sister to recolor a branch showed how dangerous changing reality was. Trying to do away with the "sister" had the potential to be as dangerous a change. She shouldn't even have teleported on the plane, but at least the plane was isolated and she was just changing reality to match what things were like at home anyway.
"Julie" closed her eyes, lay back, and mentally quizzed herself on some of the things she needed to know. How she referred to her parents and family--not difficult. What foods she liked and hated--her boyfriends--luckily just an ex. What she was good and bad at in school. The near accident in the backyard when she was 9. Who her friends were. (She had recently had an argument with Karyn, but since Karyn heard the wish, she had no memory of Julie anyway.)
Eventually the plane landed and Julie got off. Waiting at the airport were her parents. "So how was your trip?" asked her mother.
"It was okay," she replied. She really didn't want to give details of her nonexistent trip. "I'm sorta tired from the flight, though. I just want to get my luggage and go home."
"Is that a new blouse?" her mother asked.
"Um, I don't know. I mean of course it is." Her mother looked confused.
"Wait a minute. It looks like the one you had when...."
"You ought to tell us about everything that went on."
"Why don't you ask Jon? I texted him." That was a lie, but Jon could wish for such messages.
"What does Jon have to do with...?"
"Never mind, Mom. Let's go."
"Boy, you're grumpy, Julie."
"Please, Mom, I'm fine." She wished she had the stone, but she didn't. There was nothing to do but continue this meeting and the trip home. They walked through endless passageways and staircases to reach the parking area and Julie got in the back seat of the car and poretended to be tired. Not that it was hard.