Disclaimer: I do not own any Gravity Falls characters. These are all owned by Alex Hirsch. I only own my OCs (side characters) and the plot. The title is from Demon, Imagine Dragons.

English is not my first language, so there might be some grammatical errors throughout the book. Feel free to point out my mistakes.

The cover is made by me, and the drawing of Dipper is from transcendence-au, Tumblr.

This fanfiction is also in Wattpad, my username there is NinjaLuna (might contain spoilers for future chapters)

It's Where My Demons Hide

Chapter 1

Mabel's POV

I had not talked to Dipper for nearly a month. Ever since saving Ford from the portal, the trust between Dipper and me had shaken a lot.

Dipper had changed. He seemed to distrust me. He didn't hang out with me as we used to. He was always reading his journal, monster hunting, and doing other boring nerdy stuff. It made me feel like he doesn't love me anymore.

What have I done wrong? I did the right thing, didn't I? I saved a family member! I saved the author of the journals! If I had listened to Dipper, Grunkle Ford would still be stuck in another dimension! So why was he so angry about this incident?

I missed my old brother. The brother that I trust, the brother I depended on, the brother that I love. But now, I'm not sure if he's the same anymore.

The journal did it all.

It made our lives more difficult.

It made our lives more dangerous.

It shattered our bond.

I'm not going to let this continue forever.

Dipper's POV

Blue flames were unstoppable monsters, surrounding me. Its searing heat was slowly making it difficult to breathe. I looked around in panic. I need to get out of here. I seemed to be in a room. The raging fire had already engulfed the walls and was slowly itching its way closer and closer.

"You can never escape from me, Pine Tree!" cackled a voice, echoing around the room. A triangular figure suddenly appeared in front of me. He twirled his cane and laughed maniacally. Probably thinking how "hilarious" I looked. I rolled my eyes, annoyed at his presence in my nightmare. This nightmare was definitely caused by him.

"Bill, I had defeated you once. I'm not afraid to do it again, you worthless piece of –"

"Relax, Pine Tree. I'm not here to destroy you," said Bill. "I'm here to check how my puppet is doing."

"I'm not your puppet."

Bill laughed. "But, Pine Tree, you were always my puppet."

Then before I could say anything, the flames went higher and surged at me. I screamed. Then everything went black.

I opened my eyes and sat up straight abruptly, panting. This was my fifth nightmare. Since the portal incident, nightmares had been haunting me. It all started pretty well, actually. The dreams usually began with me being world famous monster hunter, or wandering around an enchanted forest. However strangely, blue flames would always appear and engulf everything. Then I end up being engulfed with fire. But this was the first time Bill had showed up. He hadn't offered me a deal, that was good. But he had told me that I was his puppet all along. What did he mean? He had broken his deal, so I'm not his puppet, right?

I glanced at my alarm clock. It was 3:49 in the morning. Yawning, I walked to the bathroom quietly, trying not to wake my family up. I washed my face and looked at my reflection in the mirror. I was still wearing my clothes from yesterday. Blue vest, red t-shirt, and grey pants. My brown hair was messy, and I had dark circles around my yellow eyes.

Wait a minute, since when did I have yellow eyes?

I couldn't believe it. It might have been a trick to my eyes. I leaned closer to the mirror and looked at my eyes. I gasped. Yellow eyes with black silts. Just like Bill.

I should tell Mabel, I thought as I ran to our room. Although Mabel had been ignoring me lately for reasons I don't know, this was serious. What was Bill planning?

"Mabel?" No one answered. When I got to the room, Mabel wasn't on her bed. She was gone. Oh no, what happened to her? Where was she? Did Bill take her?

Keep calm, Dipper. Think! Look for clues!

Then I remembered that the door was opened before I went into the room. She went outside of the shack! But why? I rushed outside of the Shack, and saw a smoke coming from the middle of the forest. Mabel! I'm coming for you, Mabel! I ran as fast as I could, the smell of smoke getting nearer and nearer. I ran to a clearing, where I saw Mabel standing there, with her back to me.

"Hey Mabel," I said, panting. Mabel turned around, surprised. Then her she hung her head down. I could see tears dropping from her eyes. She shifted uncomfortably, as if she was hiding something behind her back.

"What's wrong? Wha-" I paused. Behind her, I could see a small fire on few logs. Squinting, I saw a burnt scrap of paper with the words "Trust No One". My eyes moved to see other burnt scraps of paper, as I stood there in horror.

Mabel had burnt the journals.

Mabel, of all people.