"Mabel?"

It couldn't be. And yet... it was.

Dipper's head was spinning. He had stopped hearing from her, what, two years ago now? Had she been right here in Gravity Falls this whole time?

Mabel hadn't woken from hearing her name, but she did shift, flipping over onto her front. Being careful not to make noise, Dipper crept closer. Looking closely, he confirmed that it was indeed her. She had grown up a little bit since he had last seen her, lost some more baby fat, making her features a little bit sharper. Less cute, more beautiful. She really was an adult now.

Dipper glanced around, noticing that there hints he had missed before. Piles of clothes, a suitcase, her phone charging in a corner.

He was torn on what to do. He didnt want to wake her, but he desperately wanted to know where she had been, what had been happening in her life.

Why she had abandoned him.

"No." He muttered to himself. "Thats not what happened." But still, he felt uneasy as he glanced her direction.

A small ping came from her phone, and it lit up the corner. That was it! He quietly picked up the phone, unplugging it. He wouldn't mess with anything, just see what clues he could find.

The first thing he noticed was the lock screen wallpaper, which featured Mabel grinning while arm in arm with two of her friends from high school. Dipper could see the Eiffel Tower in the background, so this must have been when they took their Europe trip and Mabel never returned. Their parents had thought that maybe Mabel had loved it over there so much she wanted to stay, because she had slowly stopped communicating. But yet here she was in Gravity Falls. Why?

Determined to find out, Dipper swiped to open the phone, but a 6 digit passcode popped up instead.

Ugh. Of course it wouldn't be that easy.

Dipper sat down on his own bed, trying not to sit on a sweater that had been haphazardly thrown onto it. What could the code be?

Dipper knew he could figure it out. After all, who knew Mabel better than him? But it might take some time. She could be pretty spontaneous and illogical at times, after all. Her passcode could be completely random.

Assuming it wasnt some random jumble of numbers, the first thing that popped into Dipper's head as a clue for a 6 digit code was for it to be some sort of date. Their birth, maybe? He entered 083199.

A red x appeared and the answer cleared out. Damn.

What else could it be?

Dipper considered. Knowing Mabel, an important date would be sometime that made her happy. Maybe the day she had left home? He entered 061116. A red flash lit the dark room briefly. So that wasn't it either, he mused.

The day they had come to Gravity Falls, perhaps? Dipper knew the town had meant a lot to his sister, so that could be it. He entered 052312. This had no more success than the last two. Still, Dipper wasn't defeated. He had a hunch that it had something to do with Gravity Falls, so he had two more strong guesses.

The next one was mostly a happy one. The day they had saved the town. The day they had stopped Weirdmaggedon. When Bill had been defeated, the world saved, and the Mystery Shack demolished. It was also when their Grunkle Stan had lost his memories, and through the love he shared with his family, claimed them back. It was, understandably, a very important day in the Pines twins' lives. Even all these years later, Dipper remembered it very well. This had to be it, right? He took a deep breath, and entered 082612.

Wrong.

Dipper shook his head. He had felt good about that one.

That left just one date that Dipper felt could be important enough. It wasn't anywhere near as happy. Honestly, it was incredibly bittersweet. Downright side for a lot of it. But it was a day that Dipper treasured more than any other, because it was his last connection to so much that he had loved. Maybe Mabel felt the same.

The day they had left.

With shaky fingers, he entered 090112. Unlike the previous answers, this one worked, and Dipper was in.

Dipper smiled, his face lit by the bright screen. Even with all their differences, he and Mabel could be so alike.

The message that had pinged earlier and gotten Dipper's attention to begin with dropped down.

"That is crazy, M!" Said someone named Big G in Mabel's phone. Confused, Dipper hit the message to see what this Big G person was talking about. Their chat appeared, and Dipper saw that a couple hours earlier Mabel had sent a video. Dipper opened it, not sure what to expect. Gravity Falls was a place that crazy was the norm, so one had to be ready for absolutely anything.

But still, what Dipper saw shook him completely to his core.

He expected to see some scary monster, or some sort of impossible paradox that could exist nowhere else but here. Instead, it started with just Mabel, smiling at her camera in this very room.

Dipper glanced around. Should he be wary? Maybe whatever this "crazy" was could still be around. He could never be too prepared.

The camera zoomed in on her face. Dipper was confused. Was she possessed, perhaps? The camera shook, as Mabel winked at the phone camera. Dipper had a bad feeling about what awaited him.

Then, suddenly, the camera pulled back to reveal that Mabel was... she was...

Naked.

Dipper's face froze in shock as he took in his sister's bare body. She wasn't particularly endowed, but her breasts stood at attention, her legs spread slightly so that Big G -and now Dipper- could see her-

Oh no.

Mabel grinned mischievously as her free hand cupped her left breast, then snaked down her body towards her... down there. Dipper could see it glistening, she was obviously eager for whatever it was she was about to do.

"This is for you." She said huskily in the video as she began rubbing.

Dipper screamed. He clicked out of the video, unable to take any more.

Mabel, the real Mabel, yelled out as she woke up from Dipper's scream. She quickly reached down beside her bad and pulled something out. Dipper flinched as she pointed some sort of weapon at him and fired yelling the whole while.

He felt something soft and cold hit his face. It was... silly string?

Of course it was.

"Mabel!" He yelled.

She froze, really looking at him for the first time. "It can't be." She said in shock. "Dipper? Is it really you?"

"Yeah." Dipper said with a smile, causing some of the silly string to fall off his face. "Its me alright."

No sooner had the words left his mouth than she flung herself across the room, wrapping around him and knocking him onto his back on the bed.

"I missed you bro-bro." She said into his ear, giving him chills.

For the first time in years, the Mystery Twins were reunited.