First up in AU Week: Antigravity AU by Frenchfrycoolguy of tumblr. This AU is an ageswap AU meaning Dipper and Mabel are the teens that stay and work at the Shack and Wendy and Soos are the kids. Wendy and Soos are the holders of Journal 3 and, since she's the younger one, Wendy has a crush on Dipper buuuut he's kind of in a relationship with Pacifica who is his age.

Mabel and Dipper fell to the ground as Bill let go of them right after he had transported them. Mabel and Dipper gave low groans of pain.

"Next time, alert us if you're going to drop us." Dipper stated

"I will... maybe." Bill responded

Mabel got up and helped Dipper get up fron the ground. She looked around and saw that they were outside the Mystery Shack. Everything was the same so why did Bill say they were going to have a roadtrip if they were just going outside?

"Where are we?" Mabel asked

"Dimension 1 14 20 9." Bill answered

"Dimension?!" Dipper yelled, "We're in another dimension?!"

"You finally gained some brains, Pine Tree." He snapped his fingers and several brains appeared on Dipper's body

The boy shook it all off and threw one at Bill.

"Hey hey, watch it! You do that one more time and I'm leaving you here!" Bill said, starting to get angry

"See? This was part of his plan all along!" Dipper exclaimed, "Take us back right now, Bill!"

"As if I'd leave you two here! You two might still come in handy." Bill responded

He snapped his fingers and a yellow bubble was immediately formed around them.

"No one goes out of the protective bubble." He ordered

Mabel poked at the bubble and felt her fingers turn fuzzy. She laughed and poked it again and again, until her arm was out side the bubble.

"Shooting Star! What did I just tell you?!" Bill asked, turning red in anger

Mabel jumped up in surprise. Unluckily, she lost her balance and fell to the ground. Outside of the bubble.

"Oh no Mabel!" Dipper ran to help her but Bill had already transformed the bubble that no one could get it and no one could get out

Mabel rubbed her back and stood up. Dipper gave her a surprised look.

"Mabel you're..."

"What? What's wrong?" Mabel asked

"Once you get out of the bubble, you replace your counterpart in this dimension." Bill explained, "Now she got out and in this dimension, you two are sixteen. Hah, you two haven't noticed that yet? It's funny how dumb you two are!" Bill laughed

"Sixteen?" Mabel raised a brow

"Mabel!"

Mabel turned around at the sound of a high pitched girl calling her. She stared wide eyed at her caller. She could not believe it. Wendy as a twelve year old.

"Oh hi, um, Wendy!" Mabel waved at her

"Mabel, Mabel, look at what Soos and I found!" Wendy called

Mabel could not read the girl's expression. She was not sure if she was happy or angry.

"Okay sure." Mabel nodded and walked off to where the girl was

"Mabel what are you doing?" Dipper called from inside the bubble, "You don't know what's in this dimension!"

"Relax, Pine Tree," Bill said, watching Mabel walk away, "this dimension's safe. You should be worried if I brought you two in dimension 4 5 16 18 1 22 9 20 25. Haha. That would've looked fun."

"What's with the dimension names anyway?" Dipper asked

"They're codes to decipher. Haha. Get it? Cipher?" Bill laughed, "It's funny because you have no clue on what I'm talking about."

Mabel followed the younger Wendy. She was still looking around the place. It looked exactly like their dimension's Gravity Falls. It was as if she was still at her home.

"Look!" Wendy pointed at something Mabel could not see yet

Now that she was close to Wendy, she could now see clearly that she was angry. She was absolutely steaming mad. She turned the corner where Wendy was and saw a small sight thay did not look much. It was an older Dipper and Pacifica with their arms intertwined. They were happily laughing with each other. Which was weird. Were they not at each other's throat the last time she saw them together?

Mabel smiled and lead Wendy to the stairs of the Shack. She sat down and patted the seat next to her. Wendy huffed and sat down.

"So," Mabel trailed off

"I just don't get it." Wendy frowned, "You've had some failed romances before too, right?"

"Oh I sure did." Mabel nodded, remembering all her failed summer romances, "So it's kinda your problem that they're together?"

"What do you mean 'kinda'?" Wendy grumbled

"Well what do you think about it?" Mabel asked, looking at the younger girl

"It's just... I don't know. In the start of summer I was happy with Dipper. Then Pacifica came back here in Gravity Falls and everything just went badly." Wendy explained, "We even hung out at the Mystery Fair. We were having fun until Pacifica decided to butt in."

"Hey, hey, it's fine." Mabel stated

"What do you think about them?" Wendy asked

Mabel bit down on her lip. She did not know how the Mabel in this dimension reacted on them so she did not know how to react.

Mabel shrugged, "If he's happy, I'm happy. He's my brother, remember? And, well, if you really love him-."

"I didn't say I love him." Wendy blushed

"Haha, yeah, sure." Mabel laughed, "If you really love someone then you'd rather see them happy with someone else than suffocated with you."

Memories of Gideon trying to get her to date him flashed back in her memories. Everything was different here that Mabel wondered if the Mabel in this dimension experienced the same thing with Gideon.

Wendy grumbled, still not wanting to look at the older girl. The two were staring at the couple a few meters in front of them. Dipper and Pacifica in this dimension acted weird. They were in love here. And Mabel could not help but see that they were indeed a good pair. But she thought about Wendy's feelings about Dipper. Her brother felt the same way about their Wendy.

There was one night that Mabel caught Dipper just staring at the ceiling. Just staring. She thought that he was thinking about the journal and who the author was, which was fairly normal, but when he refused to give her an answer on what he was thinking about, she guessed that something else was up. Like the two of them, she felt the sad realization of having a person you like so much not like you back. It pained her a little too much but she guessed that it was part of the learning process.

"I would rather see him happy then." Wendy told her, "I always like it when he's happy. He only ever is happy when he's with some company, usually his friends."

"But you're his friend." Mabel continued

"What's the point? I'm in the friendzone?" Wendy raised a brow

"No," Mabel chuckled, "that means, you're a source of his happiness. And that's where you begin."

"Huh," Wendy looked at the older girl, "I've never looked at it that way."

"Well that's the Mabel way for you." Mabel smiled at her, "Say, have you considered telling him that you like him?"

"No, why would I do that?" Wendy asked

"No reason. I figured that you would be the kind of girl who won't tell it to him. I know Dipper's a kind of guy who would tell a person they really like that he likes them." Mabel laughed lightly, "Oh Dipper."

"Wendy, Soos, where are Dipper and-." Stan exited the Shack, "oh you're here."

"Yep. Right here." Mabel nodded

"But I thought you were at the market." Stan commented

"Oh I was just going there, haha." Mabel let out a nervous laugh, "Well I'm gonna go now."

She ran back to where she came from and saw that the protective bubble was still there.

"You got any eights?" Dipper asked as he looked from his cards to Bill who was looking at his own cards in confusion

"You mean this?" Bill showed him a card with the number eight

"Yeah, that's the one." Dipper nodded

"Then no." Bill stated, turning back to his own cards, "What are we playing again?"

Mabel banged her fists on the yellow bubble, catching the attention of the two inside.

"Hey, open up." Mabel called

Bill turned the bubble back into the one where beings could pass through. Mabel entered, turning back to her younger self.

"Dipper I've got to tell you all about this dimension!" Mabel started excitedly, "So we're sixteen here in this dimension right? So is Pacifica! And Wendy and Soos are twelve! And Wendy here has a crush on you. Beep boop." Mabel continued, poking her brother, "Ooh, ooh, and you and Pacifica are an item here!"

Mabel tried her best to conceal her squeals of joy in front of the two.

"Well she certainly had a blast." Dipper said

"Blast? Did you mean this blast?" Bill snapped his fingers and a nearby tree exploded and burst into flames

"We have got to teach Bill metaphors." Dipper murmured

"Oh I knkw metaphors. Taking things literally is just the fun way to do it. AHAHAHAHAHAHAHAHA!" Bill burst in to his regular laughter

"Can we go now?" Dipper asked, growing annoyed at his laughter, "I just wanna get this over with."

"Yes, next dimension!" Mabel grinned brightly

With a snap of his fingers, all three of them were transported to who knows where.