Go ahead and request AUs in the comments!  If I don't know it already, I'll look it up and do a chapter on it.

AUs Done:
•Underfell
•Underswap
•Outertale
•Underworld
•Negatale
•Underlust
•Altertale
•Mettatale
•Inktale
(I will continue to update this list as I do more)