Prologue

After not being able to return to Gravity Falls for three years. Dipper and Mable get an early birthday surprise and it's to go back to Gravity Falls for the summer, but that is not the only surprise that will happen to them.

I do not own Gravity Falls or the cover photo all right go to the original owners
Story idea by @Rockengirl22/ Mysterygirl and myself

No Sumt (unless requested by multiple people)

Warning May contain: Strong language, Violence, (possible) Sexual scenes