John thought for a moment and then said to Sarah,
"You know? Fuck you. I'm not going to try to fix this. I guess you and I are stuck like this"
Sarah looked shocked but replied, "Yeah right. Maybe if you were just me I'd believe you but how do you plan on living life as a midget?"
"Like this", John said and made his first wish.
"I wish that the reason I'm a duplicate of Sarah and three feet tall is a rare virus that affects 1 in a million people and transforms them in odd ways. I also wish that no one thought this was weird and all the necessary adjustments had been made for me to live a normal life as I am now".
There was a flash and John and Sarah were still in Sarah's room and still their respective sizes but now John felt something in the pocket of the small outfit he was wearing. He reached in and pulled out a wallet made for someone his size. In it was an ID with his name but Sarah's face. It also listed his current height and informed that he had this virus and was legally to be treated the same as he was before.
What he didn't take into consideration however was that with this virus in existence the stone now had a way to explain Sarah's even smaller size. At the same time he was checking his ID she was doing the same. Apparently since they were the only two people in the town who were affected they had become friends a while ago and lived together. She looked around and saw that all the furniture was sized for someone three feet tall with a dollhouse in the corner for her. There were pictures of the two of them laughing and hanging out as friends and she suddenly realized that the reason John looked like her was because he had caught an even more rare version of the virus that carried the transmitter's DNA - hers.