"Oh my god," Angela said, in shock, staring at the new seventeen year old girl that stood before her. The new girl wasn't Angela's twin, but rather what Peter would look like if he was female and seventeen. So, there was still some resemblance to his former self, but only in his face.
"Wait a minute," Peter said. "I wanted to be the same age, not this." She was astonished by her new higher-pitched voice. It seemed so alien to her. But, really, it was only one out of many things that were now alien to her.
As Peter looked down at herself in shock, Angela grabbed the stone. "This thing really can grant wishes."
Peter looked up from her breasts and stared at Angela. "Don't wish for anything! You could make things worse!" He was beginning to regret wishing Angela there.
But she didn't comply. Instead, she said "I wish ..."