Dipper Gleeful's life kinda stinks. Pacifica Pines won't be his queen because her annoying cousin Gideon gets in the way. Plus, he can't take the shack from his rival Bud. All he needs is the key to his safe. So he decides to summon a dream demon from a parallel dimension...

Note: if you don't know about the Reverse Falls AU, let me explain it. It's basically where all the character roles are reversed: Gideon is Dipper, Pacifica is Mabel. They have the same personality as Dipper and Mabel. Dipper plays Gideon's role, and Mabel is usually his twin, although she sometimes plays Pacifica's role.

In the Reverse Falls AU, this is set during Dreamscaperers:

Reverse Dipper's POV:

"Dipface, stop sticking your nose in that dumb book all day." complained Mabel. Dipper had been reading that dusty old journal for a few hours, now, and Mabel was bored.

"Quiet, Mabel. I think I finally figured out how to take the Shack!" said Dipper evilly. "Mabel, get some candles and a photo of Bud Pines!"

"You're not the boss of me, Dipface." complained Mabel.

"NOW!" screamed Dipper. Mabel punched him in the gut and ran off.

Dipper started reading the journal. Oh, how he loved that journal. But he had to find number one. But a certain demon could help him...

He read all about it: a triangular dream demon from a parallel dimension, who looks like the Eye of Providence, but with Mr. Peanut arms and legs slapped onto him.

The conditions were perfect. Eight candles arranged in a circle around a photo of Bud. Dipper opened the journal and read the incantation.

"Triangulum, entangulum. meteforis dominus ventium. meteforis venetisarium!" read Dipper. Suddenly, it felt like his stomach exploded. He groaned, and fell to his knees. His vision turned light blue. He screamed, "Asetnoheptus, Asetnoheptus, Asetnoheptus, Asetnoheptus, ASETNOHEPTUS!"

"You okay, Dipper?" asked Mabel, slightly freaked out.

Suddenly, a bag of nacho chips lying around in their room started floating. The chips flew out of the bag, and formed a larger triangle.

BING!

Where the chip-pyramid was appeared a yellow triangle with one eye. He had stick-figure-like arms and legs, with a black, tall, top hat and a bowtie.

Bill's POV:

"WELL, WELL, WELL!" greeted Bill. He looked around, and realized he was in Reverse Falls. He looked at Dipper and Mabel. "HELLO THERE! OH BOY, YOU LOOK JUST LIKE PINE TREE AND SHOOTING STAR! MY PARALLEL DOPPELGANGER WILL BE HERE IN ABOUT..."

Suddenly, another triangle appeared with a pitiful poof!

The other triangle looked exactly like Bill, but instead of yellow he was a baby blue color. He fell to the ground and started crying.

"...NOW! HOW YA DOIN', REVERSE BILL?"

"sad." squeaked Reverse Bill.

Mabel walked over to Reverse Bill. "Are you okay?" She picked him up and stroked him kindly.

"thank you." whispered Reverse Bill. "your hair smells like cinnamon and thyme."

Mabel dropped him and took a step back. "Well, you're creepy."

"W-what?" sputtered Dipper, staring at Bill. "Who are you?!"

"I'M BILL! LIKE A DOLLAR BILL!"

"Hilarious." said Mabel sarcastically.

"EXACTLY! HEY LOOK WHAT I CAN DO!"

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Dipper's face turned red. "BILL!" he screamed. "I need you to invade Bud's mind and tell me the code to his safe!"

Suddenly, Bill had an idea. WHAT IF I COULD GET THESE TWO TO DESTROY JOURNAL 3?

"YOU KNOW WHAT, KID? YOU'VE CONVINCED ME. BUT FIRST! I'M GOING TO SEND YOU TO AN ALTERNATE DIMENSION! IN THERE, YOU NEED TO FIND A JOURNAL THAT LOOKS LIKE YOURS EXCEPT IT HAS A 3 ON IT!"

"Wait, what?" said Dipper. "How do I-"

"LET'S SEE... WHAT WAS THE INCANTATION? OH YEAH! Oppositum dimensionem, summone Bill! Midas alienare mittere! Mittere dirigentes stella!"

A/N: In the canon universe, this set in between Dungeons, Dungeons, & More Dungeons and The Stanchurian Candidate.

Canon!Mabel's POV:

Mabel was bored. Ford let Dipper read the Second Journal, and he literally spent the whole day reading it.

"Dipper, stop sticking your nose in Grunkle Ford's journal all day. Can't we do something else?" begged Mabel.

Dipper closed his journal. "Come on, Mabel. There are so many new secrets in Journal #2! Maybe in a few hours, maybe tomorrow?" He opened

Mabel sighed. "You know, Dipper, maybe an adventure will cheer you up. Let's go find the Leprecorn! You know, part leprechaun, part unicorn?"

"Eh... I don't know..."

Suddenly, the room flashed white. When the light cleared, the room was gray.

Like in the mindscape, thought Mabel. Suddenly, two brown-haired kids appeared in the room and fell to the ground.

"Whoa! Who are-" started Mabel. Then the kids kids got up. "...you..." trailed off Mabel.

The two kids looked exactly like Dipper and Mabel, but with different clothes. The other Dipper wore a light blue shirt and dark blue slacks. He wasn't wearing a hat, so his birthmark was visible. The other Mabel had a light blue jacket and a headband with a green amulet on it. She also wore a short, black skirt with gray tights underneath.

"HI, SHOOTING STAR! HI, PINE TREE!"

Mabel jumped. Bill was in the room.

"Bill! You stole Dipper's body, you meanie!"

"Wait, what?" asked the other Dipper, confused.

"HA HA, I BET YOU'RE REALLY CONFUSED RIGHT NOW! LEMME EXPLAIN IT:" said Bill. "SO YOU'RE WHOLE LIFE IS ACTUALLY JUST A CARTOON THAT GIANT FLESHY OVERLORDS CONTROL. SOME FANS WERE CLEVER ENOUGH TO MAKE THEIR OWN VERSION OF IT: REVERSE FALLS! ALL THE CHARACTER ROLES ARE REVERSED: LIKE PINE TREE HERE IS OL' SHORT STACK! I EVEN HAVE A REVERSE VERSION OF MYSELF!"

"Huh?" said Reverse Dipper.

"He doesn't make much sense." explained Dipper.

Poof! Another demon identical to Bill appeared, except he was blue. He looked around, startled for a few seconds.

"Ugh, not this guy." complained Reverse Mabel.

"WHAT?!" screamed Reverse Bill, outraged at Reverse Mabel's remark. "DO YOU KNOW WHAT I'M LIKE? WHEN I'M...

"...sad?" Reverse Bill fell to the ground and sobbed.

"So, let me get this straight. We're supposed to-" recapped Reverse Dipper.

"QUIET!" screamed Bill. He snapped his fingers.

Bill's POV:

THAT WAS CLOSE, thought Bill. When he snapped his fingers, Dipper and Mabel froze.

"LISTEN, HERE. TRY NOT TO LET THOSE KIDS KNOW ABOUT YOUR MISSION. IT'D BE A WHOLE LOT EASIER IF THEY DIDN'T KNOW YOU WERE TRYING TO DESTROY THE JOURNAL! YOU KNOW, WINK WINK?" Bill winked at the kids. "WAIT, I HAVE ONE EYE, SO HOW CAN YOU TELL THAT I'M WINKING..."

Reverse Dipper facepalmed. "So, destroy Journal 3? Doesn't sound too hard."

"IT SURE SOUNDS EASY, BUT BE CAREFUL! THOSE KIDS ARE SMARTER THAN YOU THINK! AND DON'T FORGET TO BUY GOLD! AND ALSO FIND MARCI! BYYYEEE!"

And so the story begins... and please review! I've never done Reverse Falls before, so tell me what you think, and if I'm getting it right.

Note: Marci actually won't be in this story. If you don't know who she is, don't worry, she's an OC.