Karyn has an idea

Jon wasn't in his room long when Karyn knocked at his front door and his Mom let her in.
"Hi Jon" She said. She seemed normal, exactly as he had seen her last, complete with larger breast and blonde hair.
"Hi."
Karyn sat at his desk and looked at him on his bed.
"So how Zack doing now he... she's a girl?"
"She seem upset. And I think she's called Zoe now."
"Well, I know how she feels, I didn't like being a girl at first either"
Jon gulped, Karyn used to be boy? Jon knew that for her to still be female the wish must of made her a guy first, but he didn't know anything else, like when it happen or what she was like before the change. He was about to subtly ask her when she spoke again.
"You know," she started, "I was thinking last night, maybe we could use the wishing stone to make more women... Like, instead of having to change men in to women they'd just be born naturally. Maybe we could turn me male again?"
"What don't you like being a girl?"
"Well yes, it's fun and I like the feeling of being pretty... But I was born a boy and..."
"um...well"
"what is it Jon?"