Hey, guys! This is a fanfic I've been planning to write for a while, so I hope you enjoy it. Reviews, favourites and follows are very much appreciated, as it encourages me to write more, so feel free to do those things if you want. :)

Disclaimer: I do not own Gravity Falls or any of the characters. Those belong to Disney and Alex Hirsch. The only thing I own is my writing.

Chapter One

It was a windy afternoon in Gravity Falls and the 'S' of the Mystery Shack had fallen off again. There were no passers by, and the only noise that could be heard from outside was the high-pitched whistle of the wind and an odd growling sound that was probably just their imaginations. Despite this though, the residents of the house were feeling rather cheerful, due to it being a Sunday. The shop wasn't open on Sundays, so they had the whole day off to do whatever they desired. Sure, it meant that Stan wasn't going to make any money today, but there was a Duchess Approves marathon on the TV today, so he couldn't really complain. That was when the doorbell rang. Stan groaned as he got up from his chair to answer it. He would have gotten one of the twins to answer it, but it could have been those government agents again, wanting to 'talk'. If he knew his nephew- and he did- Dipper would just jump at the chance, which he knew as a bad, bad idea. If that boy squealed to the feds, it would ruin everything he had worked for. To his surprise, the person he opened the door to was a rather distraught Wendy, clinging onto her signature hat tightly so that it wouldn't fly away with the wind. Next to her was a blonde girl, around Dipper and Mabel's age. She didn't look happy.

"Whaddaya want, Wendy? It's ya day off!" He bellowed over the roaring weather.

"I need you help, Stan! I've gotta look after this brat." Said 'brat' pouted irritatedly and shivered. It was freezing out here and her hair was getting absolutely wrecked!

"And?" Stan was starting to look annoyed.

"Her parents payed me to babysit her for a few weeks, but she can't meet my family! Are you kidding?"

The old man's eyes widened when he realised what she was implying. "No," he shook his sternly. "Absolutely not."

"C'mon, man!" The teenager persisted, a desperate look on her face. "You've got that spare room in the Mystery Shack, right?" She coughed and spat out some hair that had flown into her mouth . "And I'll give you, like, half of what they pay me when they get back!"

"They payin' you a lot?"

"Oh yeah."

With a sigh, Stan finally nodded. "Fine. But I better get that money."

The teenager grinned at him widely, and walked away. "Thanks, dude! I owe ya one!"

"That's what I'm counting on!" He called back as he watched her walk away.

With another sigh, the man shoved the blonde girl into the shack and shut the door. He didn't like this girl anymore than Dipper or Mabel probably did, but he had no choice. Wendy, despite her laziness, had been working here for years and had also been indirectly looking after the kids for him in his absence, so he supposed he owed her at least this.

Pacifica glared at the man and found herself wandering into the living room. Who did the old coot think he was? And why did that babysitter think she could just dump her with these losers like that? Ugh. She was the Pacifica Northwest! He didn't like how the man looked at her. He looked at her like...like… she wasn't important. Like she was just like Mabel. Oh god, she didn't still live here, did sh-

"Pacifica? What're you doing here?" The girl's suspicions were officially confirmed by the overly-cheerful voice that had a habit of driving her crazy. It seemed that both twins were sat in a large chair in front of the TV, looking at her rather suspiciously. She groaned. This was not going be fun.

"I'm gonna stay here for a while, so you better get used to it, hon," was her sharp response. She glared at the other girl.

"And why is that?" Dipper narrowed his eyes and straightened the hat on his head.

"My parents are on… a business trip." Or on holiday without me, anyway. "Also, your Uncle is getting payed."

As if almost on cue, Stan walked in the room, a freshly brewed cup of coffee in his hand. "I hate to do this to ya, kids," he told them. "But-" The doorbell went off again and he glared at the door accusingly. "Oh jeez, what is it NOW?!" He walked over to open the door again with a grunt, only to find the last person he wanted to have visiting him standing outside.

"Stanford Pines!"

Stan raised an eyebrow. "Bud? Oh crud, look I don't have the painting anymore. I burned it. In Spain. Tomorrow."

The man laughed, though it sounded a little forced. "This 'aint 'bout that. D'ya think you can do an ol' friend a huuuuuge favour? I need someone to look after Gideon for a few weeks."

The older man frowned. "Nope. Next question." He was just about to slam the door in that sorry sucker's face, when he saw how enraged Gideon was.

"I can't believe you were gonna dump me with Stanford! You're damn lucky he said no!"

Stan's face broke into a smile and he flung the door open wider, successfully terrifying both Gleefuls. "Ya know what? SURE! I'll take in your little gremlin!"

Gideon gasped. "W-what?! No you won't!"

Stan laughed maniacally. "Oh, I will! I WILL! HAHA!"

Bud grinned. "Why, thank ya Stanford! I'll pay ya at the end o' the month." He looked over at his son and gave him a bright smile. "Bye Gideon!"

The grin, as expected, wasn't returned, but Bud had pretty much expected that. After all, the sole reason he had sent Gideon here was because he couldn't handle that child and his abuse any longer. He knew he and Stanford didn't particularly get on, but that man was the only person he knew that wouldn't fear the boy like he and his wife did. With a quick, albeit sad, wave, the man walked away.

Gideon glared at the self proclaimed 'Mr Mystery', a glare venomous enough to scare a lion witless.

Stan only smirked mockingly at him in response to that. "Come in then, you little brat."

Gideon gritted his teeth and crossed his arms childishly. "NO! I'm NOT gonna go in there! F'rget it!"

Stan shrugged. "Fine, stay out here. Get pneumonia. Either way, I get payed."

Gideon glared at him and was just about to protest, when a strong gust of wind charged towards him, causing his hair to bop up and down comically. The boy let out an involuntary shiver. It was really freezing today, though it WAS the middle of winter break, so he guessed it made sense.

Stan sighed and ushered the boy in. "C'mon kid. The shack has heating."

With one last shiver, Gideon willingly followed the man inside. He hated the cold, even more so than Stan. He decided he'd leave as soon as the weather got better.

The young psychic followed the man into the living room, an annoyed look on his face. He wasn't used to people telling him what to do and he hated it. Least of all, being at the mercy of Stan of all people.

Suddenly, he perked up. He could hear voices. One of the voices in particular caught his ears as he entered the room.

"Pacifica 'aint so bad! There are people way way waaaaaaaay worse!"

Gideon's face immediately brightened up. "MABEL, ma darlin' marshmella!"

The girl gasped and Dipper scowled. "Worse? Like, him, for example?"

"What are you doing here, Gideon?" The girl asked, almost worriedly. She didn't like the idea of being near that guy for too long. He was such a creep.

The boy opened his mouth to reply, when he was suddenly charged at by a certain pig that had been in the vicinity. Gideon screamed as the animal rammed into him and knocked him to the ground. Dipper laughed at the sight of Waddles stood on Gideon's stomach, staring down at him through those blank, black eyes.

"Auuuughhh! Get 'im offa me! Get 'im offa meeee!"

Mabel, frowning worriedly, picked the pig up and placed him onto the ground. Gideon sighed with relief. He knew his darling Mabel would save him from that beast. She was so kind!

"Why thank y-"

"Waddles, are you okay? Did you hurt yourself?" Completely ignoring Gideon, Mabel worriedly examined her pig for any injuries. "You shouldn't just attack people like that!"

Gideon crossed his arms and glared at the floor. What was the world coming to when an animal meant more to her than he did? He was going to hate it here, and he knew it.

Meanwhile, Pacifica watched, disgusted. "Oh. My. God," she muttered irritatedly to herself. "Please tell me I don't have to live with that filthy convict…"

Mabel, hearing her, gave her an incredulous look and the blonde girl shrugged in response. "What? He might be contagious!"

Dipper smirked, but forced himself to withhold his laughter. If he was going to be living with him for a while, he didn't think it would be a good idea to invoke Gideon's wrath.

Gideon, finally recovering from the shock of the merciless pig attack, shot daggers at Pacifica. "Contagious? " His tone was harsh- the psychic was officially miffed. "At least I ain't some spoiled daddy's girl that's only rich 'cuz of a lie!"

Pacifica's eye twitched. Now she was mad. "Ugh! At least I've never been arrested! Tell me, how was that 'widdle old' prison cell, huh?"

"Don't mock me!"

"Then don't insult my family!"

"QUIIIIIIIIIIEEEEEEEEEEETTTTT!"

The two stopped glaring at each other to look at Mabel. She didn't look any happier than they had been.

Pacifica raised an irritated bleached eyebrow. "Or what?"

Mabel took to looking over at Dipper, so he took that as his cue to be the 'idea guy'.

"Okay, look," he told them, planting his hands on his hips. "If we're going to be living together, we need some rules." He'd write a long list, but he wasn't entirely sure that the two wouldn't rip each other apart in the time it took to create one. "First off, you two-"

"-need to be nice to Waddles!" The more hyper of the twins interrupted with a grin.

The two visitors collectively rolled their eyes. "Definitely not." They said in unison.

"C'moooooooon guys! Waddles is a special piiiiiiiiiig!" Mabel whined, clutching her pet protectively around its' round stomach.

Dipper shrugged and said, almost mockingly, "You better do what she says or she's not gonna stop persisting."

"PleasepleasepleasepleasePLEASEPLEASEPLEASEPLEASE!"

Begrudgingly, with an irritated sigh on Pacifica's part, the two finally nodded, if only to stop that racket.

Dipper smirked at his beaming sister and turned his attention back over to the jerks that would be staying with them. "Okay, with that out of the way, rule 2 i-"

"Hold on a darn minute, Pines."

The other boy groaned. "What is it now, Gideon?"

"Where we all gonna sleep? Don't ya and Mabel sleep in that attic?"

Dipper nodded, mentally not trying to think about how Gideon would know that. He crossed his arms and pinned Gideon with a glare.

"I was getting to that. We have a spare room in the hall you can use, but we only have enough room to share, and there's no way I'm letting you sleep in the same room as my sister."

The boy pouted and Pacifica shot both boys a disgusted look. "What? I'm a Northwest! Northwest's don't share!" She planted her hands angrily on her hips, and Mabel was suddenly reminded of the host of 'Why you ackin' so cray cray?'. "Especially with that brat," she continued. "You can forget it! Nuh uh, no way!"

Dipper exhaled loudly. This was getting ridiculous. "Fine, then you'll room with Mabel. Now, anyone else got anything to say before I'm rudely interrupted again, or can I carry on with the rules?"

"I get the TV on Tuesday nights," Gideon grumbled, "and you gotta deal."

Mabel gave him a thumbs up. "I think we can do that! What do you think, Sir Waddles?" The pig oinked in confirmation and the girl giggled. Pacifica only rolled her eyes, but Gideon found himself smiling. Still, he said nothing else.

"Whatever." Pacifica rolled her eyes. "I'm going to my room."

Dipper frowned. "But what about the rest of the ru-"

She was already gone. "Oh COME ON! Is it SO HARD to listen to some simple RULES?"

Mabel gave him a pitying look and patted him on the shoulder. "Let it go, bro-bro. Let it go."

With a sigh, Dipper looked over at Gideon. "Then I guess I'll show you to my-uh OUR room." He shuddered. He couldn't believe we was going to have to share a room with Gideon. This was going to be a total nightmare.

With a giggle, Mabel picked up Waddles and followed them.

"I CALL THE CHANGEY CARPET ROOOOOM!"

"Darn it!"

Still giggling, Mabel sped off down the hall towards the room, grabbing a surprised Pacifica by the hand as she did so.