Suddenly Jon felt dizzy and when he opened his eyes instead of seeing Sarah he saw... a mirror? No, something wasn't right. But his "reflection" looked weirded out, too. Then he looked down at himself and saw Sarah's body.
"Oh fuck!" he said, "Sarah! Be yourself again!"
But nothing happened.
Jon's old body grinned.
"Oh my god! This is so strange!" said Sarah in Jon's voice, before realizing that she was no longer following his commands. Her grin grew bigger as she saw the tiny rock in her palm and she looked down at the minute girl's body Jon was inhabiting.
Jon made a lunge for the rock.
'Freeze!" shouted Sarah and Jon froze in midair.
She grinned again, "Look's like you've screwed yourself this time!"
She glanced down at Jon's body and noticed the still present erection from when he tried to make her blow him.
"You can give me that blowjob now," she said sadistically.
Jon was suddenly able to move again, but he fell to his knees and began sucking on his former dick.
Sarah just laughed as felt a blowjob for the first time.
"Let me get this straight," she laughed, "I now have the rock and you have to do whatever I say? And you're the flat-chested teenage girl you tried to make me?"
Jon just looked up and kept sucking.