When The Timeline Breaks

Dipper and Bill were on their way to the Mystery Shack when all of a sudden a bright light flashes. They look around and see that they are in the same place they just were but they felt like something was off. They continue to walk to the Shack brushing it off as a random magic serge. Magic Surges have been going on since Weirdmageddon but usually weren't anything to bad.
They walk to the shack and open the door, but as they look in they realize it wasn't just a surge of magic. it was something much weirder.

I should probably mention this story takes place 9 years after the show ended. This story is Billdip so if you don't like don't read.

I do not own Gravity Falls. Almost all characters are owned by Alex Hirsch.