"Wendy, who's this guy?"

Bigby was standing in the middle of the Gravity Falls cemetery, silently smoking his cigarette as he stared with slight disdain at the teenagers in front of him. He studied them, noting their appearances and behaviors, as he had started to have them pegged. Mundy teenagers weren't complicated, at least not the normal ones.

Wendy definitely wasn't normal.

"Guys, this is Bigby," Wendy introduced, gesturing towards her friend. "Bigby, these are the guys. Lee, Nate, Tambry, and Robbie. Oh yeah, and Thompson."

"Hey dude!" Thompson greeted, as he held his hand out towards the fable. "It's, uh, really nice, to, uh..." Thompson trailed off, noticing that Bigby was just glaring at the hand, silently smoking.

After a small, but tense, pause, Bigby flicked off some ashes. "Let me guess," he said. "Slightly awkward kid who was able to make friends but is constantly worried that they're going to find out that he isn't cool. Right?"

"W-what?" Thompson stuttered. "N-no man, I'm cool! Right guys? Right?"

Tambry sighed, annoyed. "Shut up, Thompson," she demanded, not looking away from her phone.

"B-but...ooh..." Thompson slumped over, dejected.

"You're the stereotypical millennial who's obsessed with her phone," Bigby pointed out to the teenager with the dyed streak in her hair.

"It's better than talking to you," she said, snarky.

"Trust me, the feeling's mutual," Bigby stated, taking a drag of his smoke.

Lee leaned over to Nate. "He isn't nearly as cool as Wendy's other friends," he whispered.

Nate leaned back to his best friend. "Yeah, I miss Mister Fun Times," he whispered back.

"I can hear you!" Bigby growled, making the two bros jump back.

"Ok," Nate whispered to his friend, "That's pretty cool."

"Totally."

Bigby rolled his eyes, already getting fed up with this. He should've just stayed home and saved himself the trouble.

Wendy tapped Bigby on the shoulder. "Bigby, you promised you'd be nice," she reminded.

"I never promised that," Bigby retorted.

"Just do it before I punch you," Wendy threatened, putting her fist up.

Bigby stared at her for a second, before sighing, and looking back at the other teenagers. "I'm sorry. I've had a rough couple of days and I'm not use to this."

Nate and Lee looked at each other, before shrugging. "Eh, it's cool man," Lee dismissed. "After all, we're just a bunch of teenagers swimming in hormones."

Nate snickered. "You're a hormone."

"DUDE I'LL KILL YOU!" Lee shouted, before punching his friend in the face, knocking him over. Lee than jumped on Nate, as the two started wrestling along the ground of the graveyard, yelling at each other as they did so.

Bigby slumped his shoulders, frustrated at the display, and how his night was apparently going to go. At least it seemed like the two brawlers accepted him. He took a drag of his smoke, as he noticed Thompson and Tambry next to him, with Thompson twiddling his thumbs nervously and Tambry texting.

"I still think you seem cool," Thompson stated, shakily, turning towards Bigby.

The fable looked at him. "Thanks," he said.

"I don't," Tambry said, not looking away from her phone.

Bigby just smoked away. "Ok. I'm not going to follow you on social media."

Tambry stopped texting, and looked at the sheriff. "You're a monster." She then nodded her head. "Respect," she said, going back to her phone.

Bigby smirked slightly, as he looked over at Wendy, who gave him a thumbs up and a smile. Bigby felt a little proud of himself that he was able to socialize with her friends. Maybe he wouldn't hate this after all.

"Come on Tamb, don't try to be nice to this loser."

Nope. He's gonna hate this. He saw Robbie come over to his girlfriend, putting an arm around Tambry's shoulders, as the goth gave him a glare. "And you're Robbie," Bigby said, annoyed at the teen.

"Yes I am," Robbie confirmed. "I'm, uh, sure you've heard of me. I'm the guy behind those explosion marks all over town."

"Oh, you mean the muffins?" The sheriff asked, as Wendy walked closer to him.

"They're not-! Oh, never mind," Robbie groaned. "By the way, I dated Wendy."

Bigby looked over at the redhead, who had her arms crossed, and a frown on her freckled face. Bigby then faced Robbie again. "Cool?" He asked, confused about why he would bring it up like that. He looked at Tambry, who seemed unfazed and uninterested in the conversation.

"Yeah, it lasted a bit," Robbie added, now seeming like he was trying to get a rise out of Wendy.

"Well, everyone makes mistakes," Bigby replied. "Some of them are stupid, some of them are goth."

Lee and Nate, who were still fighting, froze in place, as they stared at the confrontation. "Oooooh..." Nate groaned in shock.

"Duuuude," Lee agreed. "You just got buuuuurned."

Robbie frowned deeply, as he and Bigby stared each other down, the anger in the air palpable. Bigby would love nothing more than to just rip this guy apart, and at least for the moment, it seemed Wendy agreed with him, rage radiating off her as well.

"Uh, guys?" Thompson interrupted, coming in between them. "Can we get going?"

"SHUT UP THOMPSON!" The feuding guys yelled simultaneously at the meager teen, making him curl back.

"He does have a point," Tambry, emotionless, stated, still looking at her phone. "We're suppose to go to that shack in the woods."

"Yeah!" Lee exclaimed. "We need to go! Shack! Shack! Shack!"

Nate soon joined in on the chanting, the two getting into it. "SHACK! SHACK! SHACK!"

Bigby turned to his friend. "We're not going to the Mystery Shack, are we?"

"No," Wendy shook her head.

"Because Mabel has a sleepover."

"Oh, I know."

"She's been practicing her makeovers on the pig. Waddles had eyeliner for a week."

"I know, we're not going anywhere near that mess," Wendy confirmed. "There's a shack that was the house of a suspected witch. Legend has it she turned all of her neighbors into toads, then ate them in a stew."

"Really?" Bigby asked. "What happened to her?"

"Heh, what's the matter?" Robbie questioned. "Scared?"

"A mob came for her to burn her at the stake," Wendy continued. "But she disappeared before they could get her. We're gonna check it out."

Bigby furrowed his brow. "Are you sure we should do that?"

"Ha! You heard him!" Robbie exclaimed. "He's a chicken!"

Thompson started shaking. "But, he seems super tough. And if he's scared, what about us?"

"Eh, forget it Thompson, he's lame," Lee said.

"He's not lame," Wendy dismissed. "And he sure isn't scared. I've seen him do a lot of crazy stuff."

"Pfft," Robbie scoffed. "Like what?"

Bigby raised an eyebrow at the goth, memories flooding in his head. Since he came to Gravity Falls, he's fought fire monsters, dealt with eccentric and crazy millionaires, made a magic potion to summon a magic mirror to him, been chased by gnomes, fought a coyote, suffered a game of Dungeons, Dungeons, and More Dungeons with Dipper, and had a tea party with Mabel. Plus there was the Asylum...

No. Not going to think about that. Instead, he just stared at the self-proclaimed musician. "I don't like talking about myself. People who're self-conscious talk about themselves. Ain't that right, 'Wendy's ex'?"

Robbie's face went red, as the group started walking towards Thompson's car. Wendy playfully punched Bigby's arm, a smile on her face as she clearly appreciated the gesture. The group of teens started chanting 'SHACK!' over and over, as they were ready for the night to begin.

"Oh, where is she?"

Mabel was looking out the window in the Mystery Shack's living room, slightly frowning, as Grenda and Candy were smearing lipstick on each others' faces, laughing. They paused for a second, as they looked over at their host. "Come on, Mabel!" Grenda called. "Get in on this! This is the best lipstick war we've ever had and you're missing it!"

"I will defeat you with my mauve fury," Candy playfully threatened, before jumping at her friend again as the two started giggling uncontrollably.

"Sorry guys," Mabel apologized. "It's just that I invited someone else and they aren't here yet."

Grenda and Candy suddenly stopped, dropping their lipstick on the floor. "Whoa, what!?" Grenda shouted, getting to her feet, a shocked expression on her face. "There's going to be someone else!?"

Mabel smiled, nervously. "Heh heh, yeah, did I forget to mention that?"

"Mabel!" Candy scolded. "Why would you keep something like this from your friends?"

"I didn't know how you guys would react!" Mabel defended. "But she's actually pretty nice and I think she should hang out with us!"

"I am shocked and offended!" Grenda bellowed. "Why would you keep this from us!? If she's cool, then we're cool!"

Mabel blinked. "You guys aren't mad?"

Candy shook her head. "No, we are more than welcome to the idea of more people being our friends."

"That's great!" Mabel exclaimed, before wrapping them both in a hug. "You guys are the best!" She told them, as the two hugged her back.

"Ahem."

The three turned to the door, to see none other than Pacifica Northwest, holding a very large, purple suitcase behind her, her shades covering her eyes. "Can you at least wait before I get through the door before you guys act like freaks?" She asked.

Grenda and Candy raised an eyebrow, as Mabel widely smiled. "Pacifica!" She squealed, as she ran up and hugged the heiress.

Pacifica's eyes bulged slightly, as she was visibly uncomfortable. After a second, the blonde then pushed the Pines girl off of her. "We are sooooo not there yet," she stated, before she looked at her mane. "I swear if you mess up my hair..."

Grenda and Candy stared slack-jawed at the heiress, as Pacifica was feeling more and creeped out. "Uh, yeah? Can I help you?" the newcomer asked.

The two other girls looked at each other in shock, before getting large smiles on their faces. Grenda then turned to Pacifica. "Welcome to the sisterhood!" She bellowed.

Pacifica raised an eyebrow. "The sisterhood?"

The other three girls nodded their heads, before raising their shirts right above their bellies, to show that each one had a smilely face painted on in red. "The sisterhood!" They simultaneously said in pride. Pacifica stared quietly at the display, before her eye twitched slightly. She was starting to regret her decision to come here.

"Hey Mabel!" Grunkle Stan called from the other room, walking towards the living room. "Have you seen my back scratch-"

He cut himself off as he looked at the sight of the three girls and their smile bellies. He blinked a few times, before turning his head. "Soos! Grab your toolbox, we're getting the heck out of this house!" He called.

"Yes sir, Mister Pines!" Soos excitedly called back.

Pacifica sighed. It was going to be a long night.

"SHACK! SHACK! SHACK! SHACK!"

Thompson's van was cruising down the streets of Gravity Falls, the sleepy town completely covered by the dead of night. Thompson himself was driving the van full of reckless teenagers, as he was joined up front by Robbie and Tambry, with Robbie on the seat itself and his girlfriend on his lap, still playing on her phone. In the middle seats were Nate and Lee, joking around and shoving each other.

In the far back seats were Bigby and Wendy, who were kind of squished together because of how small the seats actually were. Both weren't exactly happy with how the night was going so far, as both had their arms crossed. A lit cigarette hung lazily in Bigby's lips, as he had hoped it would take the edge off.

"Uh, hey, dude?" Thompson called from the front, looking in his rear view mirror at Bigby. "Can you please put that out? My mom doesn't like it when people smoke in her car."

Bigby glared at the driver for a second, before taking the smoke out of his mouth, and putting it out on the ceiling of the van, leaving a little burn mark before he flicked it out a nearby window.

"Uh, thanks...I guess..." Thompson sheepishly said.

Bigby leaned on his fist, still deeply regretting his decision. Why the hell did he agree to this? He knew it wouldn't of worked out, he knew he would get irritable, and worst case scenario, he'll kill one of these mundys. So why the hell did he say yes?

Oh yeah, because of Wendy. But why does it matter that she asked? People ask him to do stuff all the time, and if he doesn't want to do it, then he isn't going to do it. Soos asked him to come over to his house and play video games, and he didn't do it. Dipper asked to help him find something called the Hide Behind in the forest, and he didn't do it. Mabel asked him to model a sweater she was working on, and he didn't do it...willingly.

They all asked him to come out of his room when he got back to the Mystery Shack, and he didn't do it.

Until Wendy asked him to do it.

So why the hell is she so special?

He glanced over at the subject of his thoughts, to see her slumped over, obviously frustrated with something.

"What's with you?" The fable asked, before following her line of sight, to see that she was staring at Robbie and Tambry, who were obviously flirting with each other. Bigby cocked an eyebrow at that. "Are you feeling weird because of them?"

Wendy scoffed. "No, it's just...I have no idea what's going on with Robbie. I thought we were cool and that we could just be friends again, but now it seems like he's trying to rile me up for some reason."

"Did he do anything like this before?" Bigby asked.

Wendy frowned slightly. "Kinda. He and Dipper had this weird feud going when Dip had that crush on me. I don't think they realized how obvious they were about."

"Well, guys tend to lack subtlety," Bigby stated, matter of fact.

Wendy smirked at him. "Oh really? I haven't noticed."

The sheriff noticed the look in her eyes. "What's that suppose to mean?" He smiled back.

"Nothing."

Bigby chuckled slightly. "Like you're the queen of subtlety. One of the first times I talked to you, you threatened me."

"And five minutes later you smacked a fire monster with a tree," she shot back.

"Heh. Good times."

"Yeah..."

The two went quiet for a moment, as they looked out opposite windows. Bigby suddenly felt awkward, and he wasn't sure why. He took a quick glance back at the redhead, who was still looking away, before he went back to his window. "Hey..." he started.

Wendy turned back to to him. "Yeah?"

"I just...want to say thanks," he said, before turning towards the lumberjack's daughter.

She got a slightly confused look on her face, furrowing her brow. "For what?"

"Just for...you know..."

Wendy rolled her eyes. "No, I don't, that's why I asked."

Bigby gave a short, exasperated sigh. "Look, I'm not good with this stuff. Just...thanks for getting me out of the room and, ya know, caring about me, I guess."

Wendy's eyes widened for a second, as she was genuinely taken aback from Bigby's words. She then got a small smile on her face, as she looked at her feet for a split second. "If you try to hug me, I'm going to punch you."

Bigby smiled. "Don't flatter yourself," he joked, as the two just tried to enjoy the ride to the shack.

"Grenda! Truth or Dare?"

"Dare!"

The sleepover had really gotten started, as the girls were all wearing their pajamas, and sitting in a circle on the living room floor. They were surrounded by multiple snacks and bottles of soda, as they were deep into a game of truth or dare.

"Umm..." Candy said, tapping her chin. "Oh! I dare you to stick this potato chip up your nose," she stated, picking up one of the salty snacks.

"Ha! That's easy!" Grenda exclaimed, snatching the chip from her friend, and promptly sticking it up her nose. After a few seconds however, her confident smile fell, as she started flailing in pain. "AH! IT'S RUFFLED!" She cried, as she fell over onto the floor trying to take it out.

The other girls exploded with laughter, as Mabel and Candy openly showed their amusement, while Pacifica was trying hard to conceal her laughter, not wanting to ruin her "cool" image. While it has already been a really strange night, Pacifica was starting to loosen up, and she was beginning to open up a bit more.

After a few seconds, Grenda was able to get the chip out, before throwing it as far away from her as possible. She cleared her throat, before getting back to the game. "Alright! My turn! Mabel, truth or dare?"

The hyperactive girl hummed to herself in thought, before making a decision. "Truth!"

Grenda smirked. "Alright, who was the last boy you dated?"

Candy gave a knowing grin. "I bet it was that hunk that lives here."

Mabel raised an eyebrow. "Bigby?" She asked. "I already told you guys, no. But there was this boy I met the other day."

"Oooooh..." Grenda and Candy exclaimed simultaneously, as Pacifica herself perked up, interested.

"Yeah, he was this really cute, athletic type boy. But he turned out to be a ghost that was stuck in a circus since the 1800's."

Grenda and Candy went quiet, as they stared at their friend. After a few seconds, Candy turned towards Grenda. "You don't think your boyfriend's a ghost, do you?"

Grenda thought for a moment. "I hope not."

Pacifica scoffed at the Pines girl. "I hope you're not still stuck on that guy. It's been like, what, 2 weeks?"

Mabel narrowed her eyes at the heiress. "So? It takes a while to get over something like that."

"You deal with something like that all the time though," Pacifica argued. "It isn't even the first time you dealt with ghosts this summer."

"That doesn't matter, it still sucked. I really liked him."

"Pfft, you barely knew him, and then tried to join the circus to be with him."

Mabel was starting to get frustrated. "Like you've never done anything crazy because you really like someone?"

Pacifica gave an arrogant smirk. "Nope. Boys try to impress me, not the other way around. It's the Northwest way."

Mabel gave her a suspicious look, before realization flashed on her face, and a devious grin started to develop. "Oh really?" She asked, in a sing song tone.

Pacifica was confused by the sudden change in the other girl's tone of voice. "Uh, yeah?"

"If you say so. Truth or dare?" Mabel asked, a victorious look on her face.

Pacifica froze, completely forgetting that it was Mabel's turn in the game. Her mind went into panic mode, as she quickly realized the position she was in. The heiress had witnessed the close friends almost torture each other with their dares all night. She shudders to think what Mabel would do to her if she picked dare after getting her mad.

Her hands were tied, and she had a feeling that Mabel knew that. "...Truth..." Pacifica reluctantly answered.

Mabel had that same look on her face. "Do you have a crush on Dipper?"

Pacifica's face immediately burned bright red, as Grenda and Candy exclaimed "Oooooooh" yet again. The blonde's eyes widened, as she fell silent.

Mabel crossed her arms, still smirking. "Well? You have to answer, that's the game."

"I...um...I-I just...I don't think..." Pacifica stammered. "H-how dare you even accuse me of...I-I don't...I mean..."

The conversation was cut short as they heard the front door open, and then close again. The four girls looked towards the noise, to see Dipper walking back in, journal in hand, looking a little tired and a little disappointed.

"Hey, Dipping Sauce!" Mabel greeted, as Dipper looked surprised at the sight in the living room.

"Uh, hi girls," he greeted, before noticing Pacifica. "Pacifica? What's going on?" He asked, confused.

"We're having a sleepover!" Mabel exclaimed, throwing her hands in the air. "What were you doing?"

"I was looking for this berry that can turn your skin green," Dipper said, "but I didn't find it. And then I got chased by a raccoon."

Mabel suddenly got a slightly panicked look on her face. "Was it wearing pink lipstick!?"

Dipper shook his head.

Mabel calmed down in response. "Good," she almost said to herself, with suspicious eyes. "He hasn't decided to come after my family. Yet."

Dipper sighed. "Anyway, I think I'm gonna hit the hay. Goodnight."

"Wait, Dipper!" Grenda aggressively called. "Why don't you hang out with us for a bit?"

Pacifica gave a huge glare towards the large girl, as she quickly caught on to what she was trying to do.

"Eh, I appreciate it, but-"

Dipper was quickly cut off by his twin. "Oh come on Bro Bro! It'll be fun! And it'll take your mind off of that apple."

"Berry."

"Whatever, it's a stupid fruit!" Mabel dismissed.

Dipper thought for a moment, before shrugging. "Alright, why not? Just let me change into my pajamas."

"Sure thing!" Mabel said, as Dipper then turned and started to make his way upstairs. "We'll have some brownies waiting for you!" She called after him.

Once the girls were sure the boy was out of earshot, they all turned towards Pacifica, with knowing looks on their faces. Grenda beemed, as she wrapped a strong arm around the rich girl. "You're welcome, buddy!"

Pacifica silently stewed in anger, as she couldn't stop herself from glaring at Grenda. And just when she thought she was going to enjoy herself.