Nightmare~ Mabill (Under Heavy Editing)

DISCLAIMER: I don't own Gravity Falls
New Summer at Gravity Falls. When the twins hear that Stan's brother left Gravity Falls it is up to them to figure out why. When Dipper won't wake up and Mabel has to make a deal with Bill Cipher. How will it turn out?

I started to write this fanfic before the last season of the show. So I didn't know the ending of the show when writing this.

I'm sorry that the chapters are short.
NOTE: This NOT a lemon, smut or anything related and will NEVER be.
WARNING: Somethings might be offensive to some people.
If the chapters seem out of order please tell me because sometimes I accidentally mess up the order while scrolling down.

UPDATE: It's basically completed. The ending at the moment is just notes of the ending and not actually written out. I might write it out some day.