An old Enemy {Bill Cipher x Reader}

You are a 20 years old girl and you just moved to gravity falls. Your cousins dipper and mabel pines are now your same age. This events are all 7 years after weirdmageddon. Your cousins never told you what happend when they came to gravity falls, and now you are going to discover it. remember, reality is an illusion, the universe is a hologram, buy chocolate, BYE!