Fourteen hours ago~

"No, you're not going."

"What?! Why?!" Mabel yelled, throwing her suitcase at her mom, "It's a FREE field trip!"

Mabel's mom pinched the bridge of her nose, "There's nothing wrong about the cost, it's where you're going."

"So what if they're going to Gravity Falls, I don't see the problem."

"The PROBLEM is that your brother is there!"

"So?"

Mabel's mom took in a deep breath, trying to calm herself, "I just- please don't go sweetie. For me. I'm sure the others who aren't going will have fun too."

Mabel sighed, "Fine, I promise I won't go."

"Thank you sweetie." she said and kissed Mabel's forehead.

Her mom left the kitchen, leaving the permission slip behind. Mabel looked at the line on the bottom for the signature and grabbed a pen.

She signed it with her mother's signature and smiled, "Gravity Falls, here I come."

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Mabel sat in the bus with a smile and excitement in her eyes.

She looked over at her "bus buddy", who was texting on her phone, "Have you ever been to Gravity Falls?" Mabel asked excitedly.

The girl took out her earphones and had a confused look on her face, "What? Um, no. I-"

"Hey look we're here!" Mabel yelled and pressed her face against the window. She stared at the Gravity Falls sign as they passed by.

The bus finally stopped and everyone got off.

"Alright kids!" One of the chaperones announced, "It's already late because of how long it took to get here, so we're going to start checking you all into the hotel. Then tomorrow we'll be taking a tour about the town's founder: Nathaniel Northwest."

Everyone groaned and Mabel kept her laughter to herself, "If only they knew." she whispered to herself and shook her head.

Everyone started following the teacher's and chaperones to the hotel, but Mabel had other plans. When no one was looking, she slipped out of the crowd and started running towards the Mystery Shack.

Once she got there, she saw her her Grunkle Ford who was just about to go inside the shack.

"Grunkle Ford!" she exclaimed.

"Mabel?!"

"Mabel?" an old cheery voice asked, peeking out of the door.

"Grunkle Stan!"

She hugged the both of them as strong as she could.

"Mabel, sweetie, what are you doing here?" Stan asked.

"School field trip, but that's not what's important." she answered, "Where's Dipper?!"

"Oh, umm..." Ford chuckled nervously as he scratched the back of his head, "I, may have, upset him which made him run into the woods."

"WHAT?!" Mabel and Stan yelled.

"I know, I know, but now that you're here Mabel, you can cheer him up. He's really missed you and I'm sure he'll be thrilled to see you." Ford said.

"Ok!" Mabel nodded and started running into the woods, "Thanks Grunkle Stan and Ford! I'll see you in a bit!"

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Mabel walked deeper and deeper into the forest in search for her brother.

"DIPPER!" she called out.

No luck.

"So... do we have a ghdi?" a muffled voice asked.

"What was that?" she asked herself.

She headed towards the voice and hid behind some bushes. She saw a teenage boy, that looked really familiar, and was about to shake the hand of Bill Cipher's statue. The realization then came to her head and her eyes grew wide and her jaw dropped.

A small ruffle in the bushes then caused the boy to turn around. His eyes grew just as wide as hers.

"Dipper?" she asked nervously.

"Ma- Mabel?!"