Under all (AU Sans X AU Reader)

I got to thinking once... if there are several alternate undertale universes with several different Sans and the other undertale characters, wouldn't there be several different versions of you?
Why not? There have been different stories about crossover Sans, even all the different Sans together. Why not the other versions of you?
So the story starts with you, yourself and you meeting each other and just like with the the other monsters in each universe each alternate 'you' has her own personality.
The different universes and how you are addressed follow;

Classic (Classic/y)
Underfell (Fell/y)
Underswap (Swap/y)
Underpatch (Gaster!Sans AU) (Patch/y)
Aftertale (After/y)
Error (Glitch)

I am rating this as 'Mature' because, unlike the other book, there will be a good ammount inappropriate language and violence and was thinking about a possible lemon or more, depending where this writing takes me.

Cover From CaptainKees
http://www.deviantart.com/art/ALL-THE-AU-S-fanart-581779200