They finally arrived at school people were shocked to see Biff with the fat slut Karyn one of these people was Sarah McMillan who angrily slapped him and stormed away.
The day passed by in a blur as Karyn thought about what to do, until it was study hall now normally she would sneak away to suck some cock in the bathroom, but this time she was alone thinking about what to do and what kind of person she used to be.
She was probably the kind of type that obsessed about being skinny and looked down on girls like her, she would probably call her a slut and a tub of lard, which she did not care if others said, but this was herself that she was talking about.
"Well I am happy with who I am now and that superior bitch can deal with it." she said to herself.
Then it hit her if the other Karyn thought so highly of herself she would probably try everything in her power to not be a fat slut and she would probably try and change Jon back as well. So if she wanted to be that skinny prude then she would have to prove it in a challenge if the old Karyn won then she would remain skinny and her normal self before the wish, but if she won Karyn would revert back into her fat sexy self.
Karyn thought of the wish very carefully before she spoke.
"I wish that when the four days are up and when I transform back into myself before the wish that a watch counting down from one hour would appear around my wrist and that my old self would have one hour to stop the watch, but that she would be unable to stop it herself and that the only way to stop it would be to have Sarah McMillan use the stone to wish the watch to stop, also Karyn will be forced to explain the entire situation to Sarah about how when time runs out she will turn into a fat obese, shallow, vulgar slut, and that the stone grants wishes, and that she had also used the stone to make Biff love fat women. And of course if time does run out my old self will transform back into my current form an obese, shallow, vulgar slut, and that she would stay that way forever."
Karyn was satisfied with her wish, it did seem a bit unfair to the old Karyn, but she really did like being this way, plus she was giving her a fighting chance, it will be up to her to convince Sarah to save her.