Bill regretted ever touching that infernal book. If only he had been less adventurous and stayed away from the danger. He was only here to visit his great uncle during the summer. But now, he had awoken something horrible and dangerous, something that could annihilate him or the world. If only he hadn't read that stupid spell.

"Hey, Triangle, do not run."

"We just want to have some fun."

Bill was on the verge of crying, hearing them chant that same rhyme over and over again as they chased him through the forest. His day had started out so normal, but then he made one fatal mistake... It was only a short while ago...

---

Bill walked down into the dark part of the forest with cardboard signs, a hammer, and some nails, in his hand. His Grunkle Stan had ordered him to hammer up the signs to point in the direction of the "Mystery Shack" so he could collect more tourists. It was incredibly hot — ridiculously hot, more like it — and he was sweating like mad.

Bill wiped the back of his tan hand along his forehead, brushing back his blonde locks. He always found it amusing when his family would say stuff like, "Wow, Bill, you look nothing like your Uncle Stan," or other stupid stuff like that. He had golden eyes and blonde hair, while Stan once had brown hair and had brown eyes. It's not like Bill depended on family resemblance to keep himself up anyways.

He wore what he usually always did: a yellow sweater with a brickwork pattern stitched on the bottom, black pants and matching dress shoes. He couldn't help but be semi-formal with his bow-tie since his dad was a serious businessman. Bill ended up going to many formal events because of this. His dad was always getting a raise, or a promotion, or something else similar to that.

Bill took hold of the wooden handle on the hammer and held up the sign. It had words painted in black on it that read This Way! and the others had different messages on them. He hated working at the Mystery Shack, honestly. He didn't even want to work there.

"So irritating..." Bill muttered and rolled his eyes and drove the hammer down upon the nail. "Why doesn't he send Wendy to do these stupid chores?" As soon as he said that he bit his tongue. He liked Wendy. She was pretty, super cool, and such a nice girl. She was sixteen though and he was only thirteen going on fourteen. At least he was somewhat tall for his age.

Bill shook his head, making Wendy disappear, and continued on with his job. He wished that his irritating brother, Will, would get off his lazy, cry-baby butt and help him, but Wendy was always protecting him. That honestly annoyed Bill. Will was such a nuisance, but Bill was always picking on him anyways.

Bill's irritation grew with each passing second. "Of course Will is probably hiding under the bed right now. Pitiful baby." He grabbed a nail and a sign and held it up with one hand, the hammer in the other. "And I thought this summer would be fun," he grumbled and then clenched his jaw. Whatever. Bill slammed the hammer onto the head of the nail and, quite unexpectedly, a loud ringing-bang type sound emitted from the trunk of the tree.

"What the...?" Bill looked around, utterly baffled, and dropped the hammer and signs onto the forest floor. He made a fist with his hand and knocked onto the tree. He could hear the faint hollow sounding echo. Bill's curiosity drove him forward and he felt up along the tree and felt an unusual divot in the side of if. He curled his fingers into the space and pulled backwards.

Shockingly, a metal panel swung open, revealing a new space. There were two switches of different colors, waiting to be flipped. Bill didn't hesitate to flip the blue one. Nothing happened. Grumbling, Bill flipped the yellow one a couple times and his excitement was peaking.

At first nothing happened, but then there was a click and the sound of air hissing out. He whirled around, eyes wide with wonder, and found the brand new opening in the ground. He hurried over to the square opening and dropped to his knees, snatching a look inside. Curiously enough, a brown leather bound book sat in the center of the metal square. In the middle of the book was a six fingered hand with a black number three painted dead-center. It was old and worn down, the pages light brown from age.

Bill reached fearlessly for the book and lifted it out of it's hiding place, dusting off the cobwebs and bugs, and admired the strange book. "What is this?" he whispered and opened it up. A small magnify-glass attached to a gold string hung out of the book. The first page had the words Property Of, but the bottom of the page was torn out. Bill examined it quizzically and turned the pages, absolutely enamored.

The next pages disturbed him, when the words TRUST NO ONE in big bold letters popped up like a neon sign on the paper. Bill was giggling like mad, completely ecstatic that he found something interesting and worth looking at. "This is so cool..." Bill continued leafing through the pages, drinking in all the words he saw. He read one part aloud, "In Gravity Falls there is no one you can trust."

Bill looked up at the forest, leaning up against the log behind him. He closed the book, thinking this over. "No one you can trust..."

"Hey, Brother."

Bill let out a scream, fumbling with the journal for a moment before shoving it inside of his sweater pocket. Bill whipped around, breathing heavily. Standing by the log was none other than his brother, William. He could have been considered to be Bill's exact opposite, beside the fact that they were twins. He had odd light-blue hair and similarly colored eyes. But, his skin was pale as snow with small freckles decorating his face. He wore a similar sweater to Bill's, but instead of yellow it was blue to match Will's hair and eyes.

Their parents tried to do that whole cheesy dress up thing where they made the twins wear the exact same clothing, but, after much arguing (Bill was mostly the one arguing) they got their parents to give them different colored clothes.

"WILL!" Bill screamed, irate. "Don't creep up on me like that!"

Will flinched away, bringing his small, delicate hands up to his face. "I-I'm s-sorry..." Will suffered from a severe speech disorder that caused him to constantly stutter and he had never been able to outrun it. The stutter only clung onto his shy and introversive personality.

Bill scoffed, trying to gain his cool back. "Well, you should be. Go run back to Stan, or something. I'm doing cool mystery stuff."

Will's eyes lit up momentarily. "C-can I come? I-I'll be g-good I p-promise."

Bill narrowed his eyes and put a hand on his hip. "Yeah right. You'd just run away screaming like a little girl."

Will's eyes began to water. It might be important to mention that Will was ridiculously sensitive. "B-but, I w-w-want to h-help."

Bill was already getting annoyed by his twin. "Just go home, Will. You are dead weight."

Tears threatened to spill down his cheeks and he sniffled. "I-I promise, though!"

"Will? Don't yell at me," Bill scolded his brother in a smug and dominant tone.

Will's bottom lip trembled. "B-but I'm b-bored."

Bill scoffed. "So? What do you expect me to do; give you a cupcake?"

Will was silent for a while, staring up at his blonde twin. He nodded.

Bill closed his eyes for a moment in disbelief. "You want a freaking cupcake?"

Will nodded more vigorously this time.

Bill rolled his eyes. "Pathetic. I'll get you a cupcake when I get back."

Will smiled, finally, and wiped his tears away. "R-really?!"

Bill shook his head and sighed. "Yes, really, you idiot." Bill stomped up to Will and growled. "Now go home. I don't want you getting hurt." Bill crossed him arms angrily.

Will nodded again and walked away from Bill. "Th-thanks, B-Bill."

"Whatever," Bill said in a carelessly tone that was tinged with irritation. As soon as Will left, Bill whipped out the journal again and searched for the most ominous thing he could find.

"Oh..." Bill breathed, "this looks certainly interesting." On the depicted page, a silhouette of two people, a girl and a boy, were floating in the center of a wheel that encircled them. There were many different symbols, ten to be exact. There was a pair of glasses, a question mark, an ice bag, a claw, a triangle that was filled in black, a strange star, a six-fingered hand, a llama, the outline of a triangle, and a stitched heart. "So cool!" Bill began to read off the page and eventually found a spell.

"I'm totally going to pull this off," Bill said in an authoritative tone before he leapt to his feet and pulled out his can of red spray paint. Bill was definitely a troublesome kid, so vandalism was absolutely on his to-do list. He drew the outline depicted and, since he didn't have any candles, he grabbed some leaves and put them into separate piles and lit them with a match.

"Ok, I got this..." he whispered and held the journal out and began to read from it. "Triangulum, entangulum. Meteforis dominus ventium. Meteforis venetisarium!" At first it was like nothing happened, but Bill then crumbled to the ground, dead asleep, and the world turned black and white.

It took a moment for him to stir, but when he opened his eyes, he panicked. The world was drained of color, expect for him. Flames suddenly engulfed the sky and Bill shielded himself, heart hammering in his chest.

Oh crap, what did I do?!

Above, where the flames were located, two voices laughed manically, and they began to take form. There was a loud bang and the two creatures appeared. The first was a boy, a little older than Bill appeared to be by the looks of it, but he certainly was not normal. He had thick, brown hair, and a glowing red Big Dipper mark on his forehead. He wore a red t-shirt and blue vest, but what was horrifyingly disturbing was the bloody hole the was in the center of his stomach. Organs hung from inside of him and the blood visibly trickled from the middle of his body. His teeth were all canines and his eyes were far from natural: glowing yellow with slit pupils.

The other was a girl, floating next to him. But if only she could have appeared better. Her hair levitated by her side like a long brown rope and she wore a bright pink sweater, but instead of it being made of wool, the sweater was made of some strange sparkly substance that looked like slime. Her teeth were also like razors and a metal bar ran across them. Neon pink drool dropped out of her mouth and the sides of her horrifying stark-white eyes. Her headband in her hair was covered in spikes.

Bill tried to scream but nothing escaped his throat, so he dropped to the floor, cowering. Oh GOD!!! WHAT DID I DO?! WAKE UP!

The boy stretched and laughed, his voice strange and echoing. "Wow! It sure does feel great to be outta there!"

The girl chuckled. "Can't help but agree! And all thanks to," she moved her pupil-less eyes upon me, "this fella."

"P-please don't k-kill me!" Bill begged and realized how much he sounded like Will in that moment.

"But why would we kill you now, Bill? You are the one who brought us here," chuckled the boy, "Besides, I'd like to torture you before we do any of that."

Bill starting shaking and cried. "NO! PLEASE!" This was all a horrible mistake.

The boy floated down and his feet touched the ground. If he weren't so twisted and grotesque, he could have passed off as some normal kid. "Hey, Mabel, it's BT."

The girl, Mabel, grinned psychotically, revealing her sharp teeth. "Oh, you're right. It is BT. Hmm... What to do with him?"

"Wh-who's Bee Tea?" Bill asked, voice quavering. "My n-name is Bill!"

"We know." They responded in unison.

"I'd like to thank you for bringing us back here! You deserve a prize!" The boy snapped his pale, illuminated fingers and the dead body of a dear fell straight in front of Bill and landed with a sickening thud.

Stupidly, Bill looked up and screamed when he saw the corpse. "What's wrong with you?! What are you?!"

The boy laughed. "We're demons, of course. Didn't read Sixer's warning?"

"Who is Sixer?!" Bill cried and tried to back away, but, all of a sudden, neon-pink chains shot out of the ground and wrapped around the teen.

Mabel smiled devilishly. "Dipper, don't be keying him in on the future!"

The boy, Dipper, rolled his strange eyes. "Who cares. I just want to get into reality!"

"What do you want from me?!" Bill exclaimed and struggled against the chains. They burnt his skin and smelled like cotton candy and death. A strange combination.

"Help us get into reality! Help us enter your world!" They told him in synch.

"My world?! You mean Earth?! No way!" Bill tried to turn and run, but when a pair of neon-blue chains shot out of the ground and pinned him to the ground he stopped.

"You will help us!" Their voices blended together into this sickening symphony.

"NO!"

"YOU WILL HELP US!"

Tears stung his eyes and he never felt so weak in his entire life. Bill just wanted to go back to his life. Bill was stuck in this strange, grayscale dimension. He wanted to go back...and get Will his cupcake...

"Wait..." Bill whispered. "Cupcake." Bill shot up and he passed through the chains like they were an illusion.

The two twin demons stopped laughing and terrifying Bill, and they both now looked panicked.

"He realized he's dreaming!" Mabel cried, outraged.

"GO! STOP HIM!" Dipper ordered her and shot out more chains but they couldn't hit him.

"WAKE UP!" Bill shrieked.

Bill suddenly shot up, screaming his head off, in the middle of the forest. It was night out and there was no moon. Bill looked around frantically and saw that the fires had been snuffed out. He scrambled to his feet, dizzy and unable to keep his balance.

"You. Will. Help. Us."

Bill screamed and whirled around, but nothing was there.

It was all in his head.

"No, no, no. Oh, God, what have I done?!"

"You will help us."

Bill took off running towards home and, hopefully, away from Dipper and Mabel.

"Hey, Triangle, do not run."

"We just want to have some fun."

A/N:
Soooo, that was an awesome and dark first chapter XD I hope you all liked it. Yes, Mabel and Dipper are scary as heck and I love it. Also that rhyme just popped up in my head and I just sorta said "why not" and put it in there. Well, I hoped you enjoyed it!
- iseykitty