Jon sat down and thought. There had to be something he could do... some way not to be stuck with Mikey's wish forever. Some kind of magic item or spell. But wishes weren't reversible and any magic item made by the stone would just be a wish and couldn't reverse anything. If only there was some other kind of magic item.
A sudden thought struck him. "Zoe!" he exclaimed and got up.
He slipped down the hallway, trying not to wake anyone else, and opened Zoe's door, peeking in. "Are you awake?" he whispered.
She moaned a bit and said "Jon... yeah. Do you know what time it is?"
"Of course I know," he replied. "Want me to wish you un-tired?"
"No, I'm just being bitchy. Turn the light on."
Jon turned the light on and walked in. "I think your wish the other day messed up. There's only one way I can think of to prevent myself from being your sister forever. And I don't know about it."
Zoe sat up. "Oh?"
"You said that your inheritance from Grandpa was a note saying to wait until you're 18. Why don't I wish you to 18? Just for a little while? Then we can see what it is."
"Hmm. It might not work. If whatever I'm supposed to be waiting for is outside the range of the wish. Or if it's something magic that knows the difference between really being 18 and wishing for it."
"On the other hand maybe I was supposed to do this. Grandpa wanted us to cooperate so he set it up that you'd need a wish to get whatever-it-is without waiting."
"All right, just be sure you make it reversible."
"All right, here's my wishes. Zoe is going to be 18 years old in five minutes from now. Also, any birthday celebration related to being 18 happened on the day before, so tomorrow is a normal day and she already got any presents or anything like that. And I can reverse any of this with another wish. Okay, I wish for all that."
Zoe was a bit taller, a bit more bosomy. There wasn't much of a change in her room, but there were a couple of open boxes lying around with gift-wrap torn. "Well, I guess you're my younger sister now, Jon," she said. "Unless I can use some of this. You know," and she pointed to one smaller box, "that looks like the box you had." It was plain wood and could hold a small object inside.
"It does look familiar," said Jon. "A bit like the one I got the stone in."
Zoe picked up the box and tried to open it. The latch wouldn't budge. She looked over to Jon, who was staring at a clock. "Time's not up," he explained. "Almost..."
They waited until the point Jon indicated, while Zoe kept fiddling with the box. At the moment Jon indicated, when she turned 18, Zoe found the box to open in her hands. Inside was....
