As per Mabel's request, the very next thing they did was get lunch. Dipper wouldn't have minded not eating for another few hours if it meant adventure, but he wasn't complaining, and neither were Dean and Sam. They needed a half an hour or so to refuel and discuss.

Lazy Susan didn't seem to think it strange that the twins and the supposed honeymoon couple she'd met yesterday were together there, but they'd all have guessed that anyway, because of her likely being senile. And this time, Sam didn't win them pancakes—half because neither of them felt like eating anymore of those things and half because he supposed he had to at least somewhat protect his older brother's masculinity.

"Looks like there's really only one option at this point," Dean said in between bites of his mediocre burger.

"Go straight to the source of these things in the forest?" Dipper assumed, and Dean smiled in pride at him.

"Yep."

"Exactly what I was thinking," said Sam. "Whatever's sending them straight into town might not even be a person. It could just be some creature living out there."

"There are a lot of creatures in that forest, though," Dipper warned, though not sounding too worried for them. "And this place is pretty deep in."

"Don't worry," Sam assured him, "we can handle it. We have a lot of… safety precautions. And, uh—speaking of which, I guess… well, this is where we let you guys off."

"What?" Dipper and Mabel said at once, frowning deeply.

"This is dangerous territory, and, well, I'm sorry, but we can't let you two tag along on this part." Back to the compassionate voice, it was. "You said it yourself, Dipper, there's creatures in there. And if you or your sister get hurt, it's going to be on Dean and me, and we can't let you get hurt on our behalf. It's too dangerous for—"

"What, too dangerous for kids?" Mabel protested, getting all spunky and independent again. "Well guess again, buddy, we're not kids. We've solved mysteries plenty of times before. We've caught monsters and gone back in time and I've even had monster boyfriends, so we are perfectly qualified for this, mister!" She finished her little speech, which had resulted in her eventually standing up in her seen, booping Sam's nose and sitting back down. It seemed she couldn't even be frustrated with him for long.

"Just because you've never gotten hurt before doesn't mean you won't this time," Dean said, looking straight at Dipper very seriously. "We can't let you come along on the actual hunt. I'm sorry."

Rather than looking extremely hurt, Dipper put on a face of a determined con-man and said, "Well, if you don't let us come, then I won't let you use the map in my book that'll lead you to the right place."

Sam and Dean froze, both of them inwardly sighing very deeply and then grimacing at each other. Touché, Mabel and Dipper Pines.

Now that everything was settled, there was no point in wasting daylight. The four of them rode the Impala to the edge of the Gravity Falls forest where they had seen most convenient to enter, at which point Sam and Dean headed to the trunk.

"What—woah, are those guns?" said Dipper, startled and excited at the sight of the Winchesters' arsenal. He hadn't expected things to get this serious.

"Yeah, it's always important we have some on us," Dean said absentmindedly, and then he turned to Sam. "D'you think we'll need salt rounds?"

"Might as well have a pistol loaded with them, just in case. Don't think we'll need the Colt, though."

"Do we get weapons?" asked Mabel in all seriousness (and hopefulness), actually jumping up and down a little.

"Uh—let's see…." Dean reached in and grabbed the two smallest daggers he could find, and handed them to the twins. "Here, it's all I trust you with. And it's only for emergency, really—if anything comes towards you, Sam and I'll be sure to shoot it."

Dipper opened up the book to the dandelion page again, and they all headed into the forest, following the paths based on his instructions. Once or twice they seemed to have walked in a small circle, and the book had to be handed to Sam to trust with figuring out directions along with Dipper's experience in the forest. And then with the couple creatures they ended up facing, two hours later they still hadn't quite reached their destination.

As they stood over the seemingly dead giant tree spider, Dean told Dipper to check the book for info on them.

"It seems pretty dead, dude," said Sam.

"Yeah, well, so did that last thing, but then it turned out bullets only killed it straight in the heart, so I'd like to just make sure," Dean replied in the most heavily sassy voice he could.

"…Nah, I think we're fine," Dipper told them. And as he closed the book, all the pages went to the front cover at first, and something on the inside of the back cover caught Dean's eye.

"Hey, Dipper—mind if I see that journal for a second?"

He raised an eyebrow, but didn't really hesitate to hand it to him. "Uh, sure. Knock yourself out."

Everyone watched him curiously as he flipped to the back cover to get a closer look, and then adopted an expression so serious that it looked for a moment as though something might've been wrong. "Sam. Take a look at this."

"What's—oh. Oh."

"Yeah."

On the inside back cover was an extremely familiar six-pointed star—the Aquarian Star. More commonly known to them as the symbol of the Men of Letters, the organization that had been providing for their permanent living space for a while now. And which held the records of all information about everything supernatural. It actually made this book's existence make more sense, now that they knew.

Part of each of them felt as though the book belonged to them, but really, it was only about the creatures in Gravity Falls, which probably couldn't be found anywhere else. Dipper was the one who'd found it, too, and it wouldn't have helped them, anyway.

"So… what's going on?" Dipper said awkwardly, not sure what the brothers were doing.

"Oh—well, it probably won't matter to you," Dean cleared his throat and said as he handed the book back, "but that journal was written by a man a part of an organization called the Men of Letters. And our, uh—our grandfather was part of that organization, too."

"Woah—so—?"

"No, it definitely wasn't him who wrote it. But hey, let's get our butts in gear, kiddos."

When they finally reached the place, it was kind of anti-climatic. Dean and Sam, being the hunters they were, half-expected something to jump out at them, or for all of them to be thrown back by some invisible force. That sort of thing usually happened with them—every time they were close to solving something, there was a new problem to deal with, or the monster that was running the show showed up.

They were used to pretty much running in ready to go guns blazing. But now, as they circled the area with their guns aimed, there was nothing to shoot at.

"I… guess they're not home?" Sam said weakly—but then they all turned to notice Mabel walk forward and pick up one of the dandelions, pause for a minute, and blow on it.

"Mabel, what are you—?"

But Dean was cut off as there was a sudden, strong gust of wind in his face, and what appeared to be an eight inch-tall woman in a leafy black dress was now floating in front of them and glaring. He aimed his gun at once, but didn't shoot quite yet. He'd learned over the years that shooting first was most hunters' problem.

"I just wished for the source of this problem to show up," Mabel said simply, though stepping back and away from the woman. "I don't know why none of us thought of that sooner…."

"Yes, I didn't expect that little development," said the surprisingly voluptuous voice of the small woman. Hell, if she was normal sized, Dean would have been likely to go after her. "Would you point that thing away from me, please?" She looked straight into the barrel of the gun and then at Dean and suddenly came off as one of those snobby British chicks. Kind of like Bela.

"Not a chance, sister. Not until you tell us what you are, and why you did this."

At that, she gave him a devilish smirk. "Ever heard of a woman called Eris?"

"You mean… the Goddess of Chaos?" Sam asked, stepping forward. He was the one who'd excelled in high school and had learned all that Greek mythology, so he knew. And even though Dean was used to Sam being the knowledgeable one, he still threw his brother a look.

"The one and only," she giggled, her laugh sounding like knives tinkling together. "She's our beloved mother—and by our I mean those like me. We used to be normal, boring fairies… but then she gave us a gift. A bite from her Apple of Discord. We live to cause chaos now. In whatever way we can, which usually doesn't leave many options."

So they were some kind of discordian fairy, then? Sounded good enough to shoot for Dean. But as he readied his finger on the trigger, Sam said, "How come you're not in Greece, then? Why come all the way to Oregon?"

"Expanding your boundaries can never hurt, Mister Winchester."

Upon realizing that Oh shit, she knows who we are, Dean didn't hesitate to fire the gun. But when he did, it seemed that the gunshot went through thin air, as the fairy disappeared just before the bullet was fired from the barrel.

In the next second, Sam was being surrounded by black mist and smoke on all sides, and it rolled and convulsed like a small storm, the discordian fairy's face flashing in and out. He couldn't see through it, and he didn't dare try to shoot for fear of hitting his brother or the twins. There didn't seem to be anything he could do from in there.

"Sammy!" Dean shouted at once, wanting to aim his gun but then remembering Sam was inside that mess. His face contorted in worry for a moment before he remembered that he also had salt rounds with him. Those wouldn't hurt Sam, and if he remembered correctly from that time in Elwood, fairies had to stop and count salt if it was dropped in front of them. Salt would evidently go everywhere, so it was worth a shot.

So in two seconds flat, Dean switched guns and shot the round of salt straight at his brother. As soon as it went through, the smoke seemed to fizzle out, and it rematerialized into the fairy as Sam fell to the ground from being knocked so hard. She looked up and glared furiously at them before beginning to count out the salt granules that had scattered.

Looked like the rules still applied even to ancient fairies bound to the mortal world. It was a high-five worthy win—but not until this one was gone for good. There hadn't been that much salt, so it was only a matter of time before she was up and powerful again.

Realizing the same thing, Sam scrambled to stand up again—and as he did, he saw Mabel standing a couple feet away in fighting-stance, holding her dagger out. Wait. Silver—that worked against evil fairies, didn't it?

"Quick, Mabel!" said Sam urgently as he stood up, pointing directly to the dagger, and she nodded and handed it to him at once. He wasted no time in rushing forward and running the blade through the fairy's back.

She screamed, but it barely lasted. Her body went up in self-consuming flames, and another sudden breeze passed, leaving Sam crouching with a knife covered in black goo. Welp. Nothing they weren't used to. If they didn't count having twelve year-olds with them, that is.

"Well, that's done with," said Dean gruffly, kicking almost fondly at the somewhat faded patch of dandelions. He was always a little nostalgic after every particularly fun case was over.

"Finally," Dipper agreed, letting out a breath that he'd been holding for about a minute. What could he say, the suspense had been killing him.

After wiping the evil fairy blood from his dagger onto the ground, Sam turned around to face Mabel and gave her a bit of a proud smile, to which she beamed. She seemed to be the braver of the Pines twins. "Next time, why don't you wish for the enemy to show up powerless?"

About halfway through on the way back, it was already getting rather dark. It was a good thing they always brought flashlights.

"You know, with the amount of mysteries in that book," Dean started to say while they carefully stepped over fallen trees, "I don't see any reason why we don't just stay in Gravity Falls. I mean, with Sam and I's skills, we could knock them all out and just—well, kill all the monsters in this forest, and maybe figure out who wrote that book, and everything would be safe once we—"

"But—"

The high-pitched syllable of protest from Mabel was unexpected enough for everyone to stop walking. She looked up at the brothers a little sadly.

"But then what would Dipper and I do?"

"Wha—?"

"She's right, Dean," Dipper started, looking serious. "I—we love solving mysteries, it's… it's what's made our summer so fun so far. We get to go on adventures every other day, and I love it. It's great. If you just solve everything… there'll be nothing left for us to do. You can't just take all of the cases at once. I won't let you."

Woah, they had not been expecting that. Sam had even been all for Dean's idea beforehand—but he understood what the twins were saying. And he wasn't going to try to take this all away from them. Giving Dean a reluctant look, he said, "Don't worry, we get it. We really can't stay here long, anyways. We've always got work to do."

"That's right," Dean agreed, his mind quickly changing. Don't want to be hanging 'round here when my angel finally decides to show up again, he thought. If he decides to show up again. "Now let's get going so we can get you guys home before it's pitch black out."

Dipper and Mabel found that Grunkle Stan barely realized they weren't home, as expected. Meanwhile, Dean and Sam stayed their extra night in the motel.

The next morning, they decided not to go to Greasy's Diner. Those pancakes had started to not agree with them after finally digesting completely. Instead, they figured they could get food once they were out of Gravity Falls.

Out of Gravity Falls. The thought made them feel a little sad, not unlike a handful of their cases. Though this was the first time in a long time they'd had one they knew they'd miss. Try years, long time.

After leaving the motel, it occurred to Sam and Dean that they ought to check and make sure that the dandelions growing in the park didn't work anymore. So they headed to Circle Park one more time and found the spot near the trees where they were growing. Sam figured it was his turn to try this time, so he picked one, wished, and blew. There was a significant lack of anything.

"Guess it's fixed, then," said Sam with a finality, tossing the empty stalk on the grass and starting back towards the car.

"Good, too—as much as I'm gonna miss this place, I really don't want to stay longer," Dean admitted. "What'd you wish for, anyway?"

At that, Sam smirked like a child with a secret, but then said, "For you to suddenly be wearing a dress."

Dean only frowned when he caught himself actually considering what that might be like.

A little more than five minutes later, the Winchesters' Impala pulled up in front of the Mystery Shack. There was no way they were going to leave without giving Mabel and Dipper a proper goodbye—though once they got there, they realized the complication with making it not seem weird, considering the twins were children and that the others there thought they were FBI.

When they were no more than five feet from the place, however, the twins came running out the front door.

"We saw you from our bedroom window!" they both said breathlessly, stopping in front of the brothers and panting to catch their breath. Mabel then said in what sounded like distress, "Are you leaving?"

"Yeah, I'm afraid we have to," Sam answered, offering a small smile. "We can't stay in one place too long, you know. There's always other things to hunt."

"But hey," Dean said, pulling a piece of paper out of his pocket, "if you ever come across something too big, or something you can't handle, don't hesitate to call us for help. More than half the time we'll be on our way within an hour." He handed the number to his other, other cell to Dipper, who took it in both hands, looked up at him with another admiring smile, and then stuffed it in his pocket.

They couldn't promise to visit out of their own free will again, though. As strange as this town was on principle, they couldn't just break one of their main rules for a little visit.

"Thanks, Dean," said Dipper. "This was all really fun—you know, we all make a great team. Two sets of siblings hunting monsters… that would make a great TV show, heh."

Dean couldn't help but think back to that time with the alternate universe and Jensen Ackles and Jared Pada-whatever, and he subsequently couldn't help the short guffaw that came from his mouth.

"It was great hunting with you guys, too," he agreed, and Sam nodded with him. "See you—"

"Wait!" Sounding suddenly alarmed, Mabel jumped up and looked up to Sam as everyone looked at her. "Before you go, can I please touch your hair? It's just so long and soft-looking and—"

If only to shut her up, Sam sighed and bent down. As she squealed in joy, he supposed he was also glad to make her so happy—until he felt a slight tug on the bottom part of his hair and heard her say "Snip."

Just as he was able to clutch his hair and stand up and yell, she was running back into the house, cackling. Another sigh.

"Great to meet you, Dipper," Dean told him after laughing at Sam's predicament, his voice fond. "See you around."

"See you around, Dean," he returned, sounding hopeful.

Dean gave him a past on the shoulder before stuffing his hands in his pockets and walking bowl-leggedly as ever back to the car. As he put his hands on the wheel and began driving, he and Sam both took in their last deep breath in Gravity Falls and decided they were never going to forget this place.

Watching them leave, Dipper etched the image of that car in his mind so he would always know if Sam and Dean Winchester ever came riding back into town. That black '67 Chevy Impala would become legend—because he was going to record it in the remaining empty pages of the journal. He wasn't ever going to forget them.

And now that she had a small lock of Sam's hair, he didn't think Mabel would ever forget, either.

The Men of Letters thing is a headcanon I came up with in the middle of writing this, and I'm really glad that I did. I also have this headcanon that the reason Gravity Falls is so full of weird monsters and things is because somewhere in the forest there's a door to Purgatory, thus letting a whole bunch of stuff out. And strictly Gravity Falls-wise, I also have a headcanon that the author of Dipper's book is Old Man McGucket, who went insane from prolonged exposure to the weird things in Gravity Falls and is the current owner of 1. And it's possible, since we don't know his first name.

And I actually did get a little sad when I was finishing this, since it would be a heartwarming end to an episode of either Supernatural or Gravity Falls. All in all, this was extremely fun to write, and I hope that any of you who have gotten this far without reviewing leave feedback!