Well, going over the three options...
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We sort of have one in Sarah's mom....not sure if we want to overlap Mikey/Sarah with Susan and someone else.
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The school slut is usually said to be Tiffany Sanders, one of Sarah's friends.
On some level, I'd be interested to see one of the high school students suddenly finding themselves starting their swap by getting things that initially seem good...find that you have the keys to a car you didn't have before...that you live in an apartment not with your parents...and then finding out there is a twist.
I also have to ask about the endgame. Karyn still has the rock. Jon is still wondering what happened to him...wondering if there will be some epiphany.