They look like this^^

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Reverse Falls
Forest

"Dipper, what was that?" Mabel Gleeful asked her brother.

"It was what you saw, Mabel!" Mason (aka Dipper) Gleeful, her brother, said walking more into the woods. "And stop calling me that stupid nickname! The name's Mason!"

"I can't call you that but he can!"

"Stop being so nosy about my love life," he said and rolled his eyes. "It's none of your business."

"It is if you snog our demon servant!" She replied.

"Will will keep on being our servant, you don't have to worry about that," he said facing her.

She sighed. "Are you sure you like him?"

"Yes."

"Well, at least he's better than Southeast," she said with a small smile that faded quickly. "You felt that?"

He nodded, guarding their expressions they both turned to Mabel's right, where a yellow swirling mass that looked like a portal opened before their eyes.

Nothing happened for a second, but then, a pair of teens came running from it. They didn't stop on time and fell on them, pulling the Gleefuls to the ground with them.

* * * * *

Gravity Falls
Forest

"I don't think this was a good idea!" Mabel Pines screamed running from the monster.

"Don't you say, Mabel!" Dipper Pines, his twin, screamed back. Running too.

Everything started the day before, the day they arrived at Gravity Falls. That day was calm, too calm for the 16-year-olds so they decided that the next day they would search for adventure in the forest.

Bad idea.

Mabel decided to poke a very cute creature but she ended up waking it up. Turns out, when it's awake, it's very ugly and ferocious. Now they were been chased around the forest by that creature.

"Dipper! There!" Mabel exclaimed pointing at a cave. "Maybe it has like a backdoor or maybe the creature fears the dark!"

Dipper, not having a better idea, nodded and they ran into it.

Unfortunately, the creature didn't seem to fear it. And continued the chase.

It seems like we've been running for forever! Mabel thought.

We need to find the exit, Dipper thought. Quick!

I just wish that we could get out of here! Both of the twins thought.

Immediately, a yellow light appeared and engulfed them in it.

* * * * *

Reverse Falls
Forest

"Ugh, sorry," Mabel Pines apologised standing up and offered her hand to the boy in the floor.

"Let me help you," Dipper Pines offered to the girl.

"Thank you but there is no need," Dipper Gleeful replied standing on his own, as did his sister.

"Dipper where are we?" Manel Pines asked her twin.

"It seems like the forest in Gravity Falls," he replied looking at the place.

"I'm sorry but you are not there, you are in Reverse Falls," Mabel Gleeful said. "And did you called him Dipper?"

"Dipper Pines. It's not my real name though, I got it since I have this on my forehead," Dipper Pines said taking off his hat and brushing his hair to the side, revealing his birthmark.

Both Gleeful looked like they were doing equations on their heads and then turned to look at each other.

"Is your name by any chance Mabel?" The male Gleeful twin asked and she nodded hesitantly.

"How do you know my sister's name?" Dipper Pines asked protectively.

"I think that we know where you are," the female Gleeful said. "You are in another dimension, though I don't know how or why and that is... odd."

"What?" Both of the Pines exclaimed.

"Let me introduce myself, my name is Mason Gleeful but this one here nicknamed me Dipper when we were young. The name comes from my special birthmark of the Big Dipper on my forehead," he said revealing the mark under his hair.

"I'm not the only one who calls you that," his twin chirped.

"Shut it, Mabel."

"Whatever you say," she said sarcastically.

"I've never thought I would be able to catch a glimpse of another dimension, even less to meet myself!" Dipper Pines exclaimed excitedly.

"Is your dimension too different from ours or just a little?" Mabel Pines asked curiously.

"I wouldn't know," the other Mabel replied.

"But how did we ended up here? And why here... of all the places in the multiverse..." Dipper thought aloud.

"Maybe we can help you decipher that," his doppelganger said. "We have a servant who may know plenty of this things. Plus, we have a big library and we could search for something."

Mabel Gleeful didn't show any emotion but inside she was wondering why did her brother just basically asked them to stay over. It wasn't like him to do charity.

"Would you let us stay at your house?" Mabel Pines asked delightedly.

"Yes," he said shortly and then continued. "And how is life, I mean, it must be different from ours and having a little of background could help us in finding a way to get you home."

"Well... what can we say? We live in Piedmont, California but we came for the summer. In our last summer there we survived a sort of like an apocalypse," Mabel said and then looked at her brother to continue with the tale. But the other Dipper spoke first, "What do you mean?"

"During our stay, we met a demon who wanted to create havoc and chaos on our dimension, he actually did it: the Weirdmaggeddon. But only for three days because we defeated him. It was a crazy summer, one of the best of our lives," Dipper Pines talked. "We met our grunkles, Pacifica, Gideon—"

"Ugh, Pines and Southeast," Mabel groaned.

"Who?" The Pine twins asked. The only Pines they knew were them and their family.

"Gideon Pines and Pacifica Southeast," Dipper Gleeful clarified. "He lives in between the city and the forest with his parents. Pacifica on the other hand just stays the summers in her cousin's house. Meaning Gideon."

"They are really nosy about everything and like to cause trouble," his twin complemented. "Quite a headache are they."

"In our world, their names are Gideon Gleeful and Pacifica Northwest and they have no family connection," Dipper Pines said. "She is super rich because they lost a lot of fortune and Gideon is normal, I guess. They both live in Gravity Falls."

"Used to be a headache, we are good friends now!" Mabel exclaimed.

"He used to have a crush on Mabel and I'm dating Paz."

"My brother here broke up with our Pacifica," Mabel Gleeful said with an amused smirk, "last summer. Now, he's dating again."

"We've been dating for six months, sis," Dipper remarked. "That you didn't know is another thing."

"Who am I dating in this dimension? Is it Wendy? I used to have a crush on her."

"That goth girl? Not at all," Dipper Gleeful coughed. "I'm dating Will Cipher."

"He is a dream demon," Mabel Gleeful added.

"So I'm dating the Bill of another dimension... how great," he said shocked.

"How did you met B-Will?" Mabel Pines asked Dipper Gleeful. "Because we met him when he entered our Grunkle Stan's mind and tried to kill us."

"He tried to trick us into a deal when we were 10," he answered. "But something was off and we uncovered his true plans: to enter our minds and to control our bodies."

"We defeated him with the magic he taught us and made him our servant," Mabel Gleeful snickered.

"That means you get to boss your Bill around! Cool!" The Pines girl bubbled.

"Should we get going to the mansion? It's gonna get dark," Dipper Gleeful suggested.

"You live in a mansion? That is awesome!" Dipper Pines beamed. "I just noticed but you really told us nothing from you and we basically told you everything."

"We've lived in Reverse Falls since long as we can remember. We live in the Mystery Mansion, though it's just called like that because never anyone outside the family has ever seen it from inside," Mabel Gleeful told them. "Not even Pines or Southeast and they sure have tried."

"We work at the Tent of Telepathy, with our magic we can do amazing things," her brother bragged. "Of course, the town's folk don't know it's magic."

"We live with our parents and our grunkles," Mabel continued, "the former are not home and won't be for at least a month."

"And our Grunkles are not very sociable people so, unless we are talking about a show at the Tent, they probably won't come out of their rooms. And that only happens about once or twice a month," Dipper finished and started doing weird hand movements in the opinion of the Pines.

"What is he doing?" Mabel asked the other Mabel.

"Creating a portal to the mansion, we can apparate ourselves but it could be tricky carrying two other people," she replied and a portal that resembled the one that brought the Pines to Reverse Falls, but this was deep blue.

"After you," Dipper Gleeful said to the Pines as they passed. When they were no longer there, they passed.

* * * * *

Mystery Mansion's hall

"This place is so cool," was the first thing that escaped Mabel's lips once she crossed the portal.

"Welcome home Master Mason, Mistress Mabel," a blue-haired guy with moderate brown skin said. He was wearing a long-sleeved white shirt, a light blue vest over it. He had, also, black pants, black shoes, black bowtie and an eyepatch-like thing that covered his left eye.

"Greetings, Will," Mabel Gleeful greeted him.

It was kind of weird to see him since he was the Bill from another dimension, but in human form and alive. It had been years since they saw Bill alive.

"Will Cipher, meet Mason and Mabel Pines, us from another dimension," Dipper Gleeful introduced them and it was an understatement that Will was surprised.

"I prefer Dipper," he said.

"Even better, we shall call you Dipper and Mabel shall stop calling me that so we don't get confused," Mason concluded. "Please tell the cooks to serve dinner, and that we have guests.

After that, they ate a probably very expensive dish, mostly in silence.

"Will," Mason broke the silence once they finished, "the Pines are going to stay in the mansion while we find a way to get them back to their home. Please prepare the spare rooms."

Will excused himself, stood up and started going when he felt someone touching his shoulder. He turned and saw that it was his boyfriend who immediately pulled their bodies together and kissed him. When they broke it, he murmured some words in his ear and squeezed his butt. Cipher only nodded and left.

This made Dipper Pines very uncomfortable since it was technically him who did that and made a very awkward Mabel Pines. Mabel Gleeful just wanted to have a talk with her brother.

* * * * *

Mason Gleeful's bedroom

Mason was peacefully rereading his favourite book when a knock was heard from outside his door.

"Come on in," he said and the door opened to reveal Mabel, his sister. "What brings you here, sis?"

"You know why I'm here," she replied. "What was that show you put up after dinner? You wanted to make them uncomfortable, I get it. But's not like you to do public affection."

"Ah, so you saw past my actions, as expected," he said closing his book. "Yes, I do admit wanting that, it was hilarious. What I assume you want to know is what I really told him."

"Yes, and why did you invite them over, or offer our help? We don't do charity."

"I like to call it... an investment. I can tell you more tomorrow but I made Will put something in their rooms," he smirked mysteriously. "If it works, we could get the empire we've always wanted. If not, we won't lose anything."

"I really like the sound of it," she chuckled. "Well, good night, brother."

"Good night, Mabel."

She walked to the door and before opening it she said with a big smirk plastered across her face, "In my way here I think I saw Will nearby... just remember to use protection."

The following reaction was a very flustered Mason. "Get out!" He shrieked.

*********************************************************************************************************************************

It's finally up!

I hope you like it!

The following chapters are not (probably) be as long as this one. I just really felt that all this belonged in the first chapter.

Now hit the vote button! Harder! Faster! And comment your opinion!

See you in the next update.