Author's note: Just in case I forgot to mention it, there are pairings...

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Trapped in her Mistake

Mabel woke up with a start. Her lungs burned like hell; she couldn't stop inhaling.

"Mabel!"

She was greeted by a tight embrace. "Pacifica?" she mumbled in recognition. Mabel hugged her friend back stiffly.

"Why are we... here..." she asked, her breath steadying. Pacifica only hugged tighter, as if it were the answer to the question.

Mabel melted into the hug.

The doctors weren't in the room. They had likely confirmed Mabel and Dipper dead.

A barrage of questions disturbed Mabel. Some didn't even form full sentences.

Hospital? Pacifica here? Black- Where was I? How...

"Hey girl, breathe," Pacifica interrupted while grabbing her shoulders. "Thanks...I- I needed that," Mabel said. "I was in the house, and it was Christmas, then Stan came... Then it was all black and...

"Dipper!" Mabel exclaimed. At that moment, Pacifica's joy faltered. Mabel continued.

"I could hear him, and he could hear me, but I couldn't see him! We were in some creepy wrecked up world. I remember he said some name... the world's name... what was it?"

Pacifica wasn't listening to her anymore. She was lost in her own worries. Dipper... did I mention him as part of the deal? I asked for Mabel back, sure... oh shit. I messed up. But that stupid demon did say he would put 'souls back in those bodies'.

Her thoughts were cut short by Mabel looking to her left. To where Dipper's unmoving body lay.

"Dipper!" she gasped. She shook his body gently at first, then more vehemently when he didn't respond. Pacifica stood up, but before she lost it, Dipper croaked.

"I'm okay, Mabel. No need for that. Seriously."

Mabel delightedly punched her brother. "You're okay!" she squealed.

"Oww..." Dipper turned to Pacifica. "Oh hey," he managed.

Pacifica released a sigh she didn't know she held in. Everything was right after all.

"Except you never asked for Dipper back.

And I never said it was his soul."

Bill Cipher laughed at people's stupidity from far away where none could hear him but himself.

Well, he did what he meant to do. Now it was about time he paid someone a visit.

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It was black. Completely, pitch black. Where was Mabel?

Dipper found himself blind. The only feeling was numb, and the only sound was himself.

But before that, he had heard Mabel's voice. His twin told him she was in the same situation. In nothingness for what seemed like an eternity.

However, no one can stay frightened for an eternity, so the twins started having small talk and playing games.

"I spy something... black!"

"Um... everything?"

"Right again, brobro!"

"This would be more fun if we could see anything, Mabel."

"But we can't, so deal with it," she giggled.

"Fine, I don't spy something... glittery..."

"It's me! It's me! It's me!"

"Gosh, what gave it away?"

"You forgot adorable and irresistible!"

"Are we talking about the same person?" teased Dipper.

"Hey, Dipper?"

"Yeah Mabel?"

"I- I spy something white."

"Yeah, really," he scoffed.

And he didn't hear from her after that. "Mabel?" he called out.

No answer.

She can't leave me here! Dipper panicked. He still sensed her around a little. He decided it was a twin thing. I'll be trapped here alone if she wakes up.

If she wakes up.

"Mabel! I've got it! This isn't just some dark paranormal void-It's the Mindscape! Mabel!"

But whose?

She had to hear him. Dipper thought she did, but she didn't reply. A pang of loss hit Dipper. Mabel wasn't there anymore. He couldn't sense her any longer.

He groaned in defeat. "What the heck did I just get into?" he complained. "There was only a Christmas Party! How'd it turn into this? What happened anyway? Invitations, Gift wrapping, Grunkle Stan was going to arrive! Everyone we know in Gravity Falls were-"

Not everyone in Gravity Falls is your friend.

Dipper was forced to pause. Did he just think that?

Great. Now I'm talking to myself, he thought grimly. Albeit he wasn't convinced by his own excuse. Worry and dread crept upon him.

Who else had he unwillingly invited?

Before he could think about it, his head started to hurt miserably. "Aah!"

Then the void all around him started thumping as well. He made the connection.

He was in his own Mindscape.

A flash of white and blue swallowed him up. A figure of swirling black appeared before him.

It spoke, its disembodied voice rang like a song.

"Sorry, 'Dipper' but this is the last time you'd be allowed in here~~ EVER!"

And with that, he was forced out of his own mind. Banned from it.

He was in a different Mindscape now- a gray version of The Shack.

And there was Bill Cipher.

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Dipper screamed. It wasn't manly.

Bill shut him up with a mere snap of fingers. Instead of a scream, Dipper barfed out a giant, flaming blue worm that turned into a cocoon. "Gross!" Dipper cringed.

The cocoon hatched, and out came a butterfly with Soos' head. "Sup, dude?"

It crashed through the Shack's wall and disappeared inside.

"Pinetree! It's been a while, Kiddo!" The triangle circled him in midair.

Dipper took a defensive stance. "Bill! So you're behind all this!"

Bill laughed mockingly. "That is a lot of bravado! Guess this means we're ignoring all that screaming and worm biz that happened just now, huh?"

Dipper's cheeks turned red in embarassment. "I- you... S-stop dodging the question!"

"How cute. You didn't ask a question."

"Are you behind all this?" Dipper nearly shouted.

"Am not!"

"Are too!"

"Am not!"

"Are- would you quit it?"

"Ha! I swear, Pinetree, I haven't been pulling the strings on this one!" Bill said. He tumbled then scratched at what could have been his chin (if he had a more human shape.) "Okay, maybe I pulled at some strings, but what can I say? I'm a helpful guy!"

Dipper scowled at the triangle in distrust. Something bad always happened when he was around.

"In fact," Bill continued slyly. "I could help you right now, if you want."

"Never!"

"That's what you said last time, and look who ended up in your body."

That sounds so wrong! Dipper thought. "Why?" asked Bill. "That's exactly what happened!"

Bill flew higher and landed on the Shack's ledge. Dipper unconsciously floated a few feet off the ground to see who he was speaking with better. "Wait, did you just read my mind?" the boy asked, getting creeped out.

"Sure. Did it to your sister once, but I suppose it would be more correct if I told you I read your thoughts, not your mind. How is Shooting Star, by the way? Not like I don't already know, but..."

"Stay away from Mabel!" Dipper was now at the same distance as Bill from the ground. "And what do you mean by 'read my thoughts' instead of mind?"

Bill poked Dipper in the gut with his cane. "Aren't you paying attention, Kid? You just got kicked out of your own mind! You're not 'Dipper' anymore, Pinetree."

"That doesn't make any sense! Of course I'm still Dipper!" Righht?

The demon twirled his cane. "You can call yourself that, but consider this. Dipper has a body."

He split into two, and the second Bill said,

"Dipper is alive." The second Bill split into two, and the third Bill added,

"Dipper has Mabel."

"I DO HAVE MABEL! THE FACT SHE ISN'T HERE RIGHT NOW DOESN'T MEAN SHE'S NOT MY SISTER!"

Dipper was now above the Bills, looking down on them. They didn't seem intimidated in the slightest. "Ooh! Some of that fierce thing," one of the Bills commented. "They all end up loud, don't they?" another said. The three exchanged looks of agreement.

"How can Mabel be yours if she still has a 'Dipper'?" the last asked. That Bill's eye lighted up and projected a video. The other two sat before him, conjuring popcorn. The video showed six people walking in a hospital hallway.

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"For the last time, Grunkle Stan! We're fine now," Mabel tried explaining. Her great uncle cut her off.

"Seriously kid! Is this some kind of prank? Right on Christmas Eve nonetheless! You should be ashamed of yourselves."

"No really, Grunkle Stan. We don't know how it happened," the new 'Dipper' said. "I think the Journal-"

"Dipper, you just came back from the dead. After nearly giving us heart attacks, you just act all chill, ready to kill yourself again hunting monsters. Slow down a second there, man," Wendy scolded, though there was really no sting in her words.

Dipper looked down smiling. "Right, sorry," he mumbled, scratching the back of his neck. Mabel lightly punched his shoulder. She was holding a quiet Pacifica in her other hand. "Don"t worry," Mabel whispered to her brother. "Because we nearly died, Grunkle Stan's paying for the next meal."

"Heard that!"

"You still are though."

Their Grunkle grumbled something undecipherable. "Excuse me, sir," a nurse approached them. "You didn't pay for the operation." she said. "Operation? That didn't help these two come back to life anyway!"

"Of course it di-"

"I'll tell you what did. Sheer will power!" Wendy pointed.

"Manliness!" Soos called.

Grunkle Stan fisted the air. "Stanliness! Beat it, nurse!"

As if on cue, every one of them, Pacifica and the nurse excempted, broke into a deafening chant.

"Pines! Pines! Pines! Pines!"

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"Pines! Pines!" the two Bills continued after the video ended. Dipper was horrified. His imposter acted exactly like him, and no one noticed a thing. Not even Mabel.

She punched him, Dipper thought. Bill was right. Mabel still had her own Dipper.

Whilst Dipper emoted, the Bills high fived, chatting about the 'movie'. One Bill pulled the 'too slow' prank on another, causing the latter to fall down and combine with the former. "Whoops!" the first Bill exclaimed. "I guess that means you too."

The two remaining Bills combined forming the one and original, Bill Cipher.

Bill Cipher did a short tap dance with his cane, then hopped to Dipper. The boy was on the ledge, hugging his knees.

"Pinetree? You in there? Knock- knockin' in your noggin!"

Dipper finally replied. "Am I stuck here?"

Bill patted him on the back. "Yep!" he answered ironically. "With me. For eternity."

Dipper's head sunk behind his knees in despair. Bill insensitively continued. "On normal circumstances, well, normal for this situation, there'd still be a chance for you to escape, but the soul- who- is- now- Dipper made sure that wouldn't happen!"

"How do you mean?" Dipper asked, all tensed up.

"Easy. He put me 'in charge' of you." Bill's eyes narrowed in delight.

Never before has Dipper felt so messed up.

"Oh shut up, Pinetree."

"I didn't say anything."

"Like you needed to! C' mon, c'mon! Let's go in the Shack~" the triangle urged playfully.

"There's no way..."

"Oh please! As if you have anything better to do for all eternity."

He's got you there, Dipper said to himself. Before he could refuse, he was being dragged away by Bill who was unnaturally strong for his size. Dipper heard this little voice at the back of his mind:

'Hey. Heyy. Remember when you said nothing bad would happen? That there was 'no way the supernatural was gate crashing your Christmas party'? Well surprise, surprise, mothaf***a!'

Yes, Dipper did hate himself, thank you very much.