Jon watched in his room as his Dad took away the other... Jon, confused.
What was going on? Exactly what change did that wish make? There had to have been some reason why there was one of him, with a girl's body, that his whole family was apparently supposed to have sex with.
"I wish I knew what was going on with that girl who appeared."
Jon had expected the stone to shout words into his head in some way. Instead, however, he found himself compelled to turn his head to the side and look down... where he saw a little booklet. "Your New J-1514 Model." Jon picked up the booklet and started to read it, ignoring the shouts from the other room as best he could.
"Your J-1514 Biological Unit comes in two models, male and female. It is programmed with a working knowledge of the English language and looks fully human...." Jon read on and on, and it seemed that the other Jon really was a kind of property. They had a limited ability to change some aspects of their body; however, they had to stay female and retain the same mass and skeletal structure. Apparently this one had Jon's face because Jon wanted to experiment. Turning the girl's entire body into himself would leave her too short, with female anatomy. So instead Jon changed just the head and face.
Changing the body was done by giving it some special pills while telling it to change. It would fall asleep and 24 hours later the change would be complete. So if two people wanted to use it in a row, they had to wait or use it as it was.
And it was supposed to be a blank slate when bought. No memories. Of course, Jon did hear the wish, and if you hear the wish, memories remained.
"Just leave me alone," pleaded Jon. "I'm your son, I'm not into that stuff with you." Which she would have said.
Only she didn't. Because while she kept her own memories, she still had the instincts of what she had been transformed into. That's why she found the original Jon sexy, and that was why she could only whimper now.
Jon's dad guided her out of the room, and she made her own way back to Jon's.