Being a girl wasn't bad at all. But, of course, Jon and his brother and father weren't really girls. He'd have to use the stone for that.
"I wish that I was a girl, that Mikey was a girl, and that my dad was a woman," Jon said, smiling. He was so wrapped up with his "new" life, though, that he had forgotten that the personality swap wish had a time limit. In a week, his family would return to normal. But now, thanks to the absent-minded Jon (or was it Jen now?), he and his brother and father would forever stay as females.
After the stone glowed, Jon looked at his new female body in the mirror.