The Star and the Demon

Ever since they were 12, Mabel and Dipper Pines have been coming to Gravity Falls every summer, and they both decided to stay with their Grunkle Stan and Great Uncle Ford in Gravity Falls when they turned 15, and was sadly also the year Gideon was released from jail *cough* hate Gideon *cough* so much *cough**cough*. Now they are both 18 and are living in Gravity Falls with their Grunkle Stan and Great Uncle Ford. But what happens when Ford is hosting a Gravity Falls science convention where Dipper is going to make a presentation, but never shows up? It is up to Mabel to find her brother, but will she be able to handle a dream demon as well?

To all you "Beauty and the Beast", "Gravity Falls", and Mabill fans! If you have no idea what Gravity Falls is, watch the episodes so you don't get confused. In this book, none of the characters know who Bill Cipher is. Most of the events still happened, but for different reasons. If you have questions, just ask in the comments and they will be answered.

I do not own the characters to Gravity Falls!

This is my first fanfic, if it is bad, please don't hate me and if you have advice, I would really appreciate it!
This is appropriate for all ages and there will be no inappropriate content.