Dreaming in the Darkness {A Bill Cipher x F. Reader story}

After 18 long years of having no father figure in her life, Y/N L/N and her twin brother, Rowan, leave their beloved home and mother for answers. Answers to what exactly? What has happened to their dad, and where on earth is he? With only one clue being where their uncle resides, they travel to Gravity Falls in Oregon to start investigating.

As they get closer to finding the truth and also finding answers untold for, a certain dream demon by the name of Bill Cipher becomes invested with Y/N and is unsure why. What will happen to Y/N and her brother as they unravel mysteries together? And why does it always feel as though they're being watched?

Disclaimer: I do not own Gravity Falls, and I am just participating in the fan base with this fanfic. I do not own any of the characters except for Y/N's brother and any other characters whom are not in the actual show. I will be using parts of the show's timeline as a part of the story because things will make more sense that way (you'll find out why later). Read at your own discretion!