⚠️~Let's make a deal!~⚠️ [Bill Cipher X Reader X Dipper]

When Y/N L/N comes to Gravity Falls after the incident of Weirdmageddon she encounters the Mystery Shack and The Pines Family and when she accidentally helps a certain dream demon escape his stone prison she is in for a heck load! Meeting someone or something she never knew before and keeping their secret in return of some kind of bond made by a secret deal, how can she deal with keeping the deal and secret while being close friends with the enemy of that being she has a deal with? Your going to have to read and see