"Of course I'm surprised," replied Jon inm that sexy voice. "What are you doing? This has to be the stone. What is this, a little revenge? Being mean to me for... you know, I have no idea what. I never did anything to you."
"What I'm doing," she replied, "is taking possession of this nice magic stone. And I'm not being mean at all. I didn't turn you into a dog or even a stripper, or give you any weird fetishes... there's nothing wrong with you. You look great!"
Sarah added "I just needed a little help, that's all. I wish that you're my dad's new accountant, until I change my mind. Also, I've always wanted a sister. You know, Mom left a long time ago so I never had a chance to have one."
"And I bet you're going to turn me into your sister, right?"
"I wouldn't be so crass. I wish that before the end of the week you and Dad will have sex and you will become pregnant with a girl. I wish that your pregnancy will develop fast and that after the birth the girl will grow fast until she's older, but not as old as me. I wish that when she grows fast reality will change so that you and Dad had sex the right number of years ago. Finally I wish that when my new sister learns how she was created she really likes the idea and is grateful to me for it."