I changed some details from the oneshot.

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Your POV

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Hello! I'm Y/n! I'm 15 years old and I live in Y/ht!

I'm in the car with my parents on the way to our summer home in a town called Gravityfalls! I'm so excited! I've been here before but I'm way more excited

I see the sign and bounce in my seat.

"Are you excited honey?" My mum asks

"Of course I am!" I respond

She laughs and we pull up to a nice 2 story house with a porch and some windows.

I get out of the car and run around, Ah fresh air! I'm going to enjoy it here once again.

"Y/n! Help us with the luggage!" My dad shouts

"Ok coming!"

I run over to him and take my bags and a suitcase.

I take them in the house and leave the suitcase at the door but go upstairs to find my room, I go into the first one and see my beautiful bedroom.

My large window, the yellow wallpaper, a shelf next to the window and a dresser with a mirror above it. I open my bag and place all of my clothes and put them in the dresser.

I smile and grab my backpack and put a jumper inside with my phone, I go downstairs to see my mother.

"Mum, can I go exploring?"

"Of course honey, here, be back by sunset and don't forget to mark your way!"

She tosses me a sandwich and 2 bottles of water, I put them in my bag and put my coat on. I grab my pocket knife and nod. I go out the door into the woods and walk towards the Mystery Shack. I put on my beanie and continue walking.

The beinie:

I walk further into the forest, marking my way back home the I  hear people talking, I slowly approach the sounds and see a clearing, I then see 2 kids and Stan at the shack, I walk towards them, Stan sees me.

"Hello, their Y/n!" Stan says I've met him before on the first year, I bought my beanie hat here.

"Hi Stan, I'm on my summer holiday once again, Who are these cuties? Haven't seen them before" I say happily

"Nice to meet you! I'm Mable!" The girl shouts. I wave.

"I'm Dipper, sorry for my twin sister she is hyper" Dipper says.

"Nice to meet you guys! I'm Y/n as Stan said, I hope you enjoy Gravity Falls wonders"

I follow them into the shack and look at all the things. Stan hasn't changed.

The twins come back down and Dipper taps me, I turn around.

"Yeah Dipper?"

"Can we go out into the woods?"

"Sure thing!"

We walk into the woods and I mark the route, I then see a clearing and hear rushing water. We speed up and when we get there we see a beautiful waterfall. 

"It's so pretty" Dipper says in aw.

"I know, there is also a cave behind it"

I look up and see the sun setting.

"Come on Dipper, we got to get back, my mum wants me back at sunset"

He nods and I take him back.l

Time Skip

After I drop him off I walk back to my summer home, I see a flash of bright light in the corner of my eye. I pull out my knife and walk towards the light. I then see a floating triangle with a top hat, arms and legs.

I go out into the clearing.

"Hello?"

The thing turns around to me.

"Hello, their meat sack! I'm Cipher! Bill Cipher!" The triangle says in an annoying tone. God so annoying, I think.

"That's not very nice Y/n!" He says.

I step back. What the hell.

"Don't run! Wait!" He calls out.

"What do you want?"

"I want to make a deal!"

"What type?"

"I need help to understand the humans"

"How am I supposed to help?"

"You bring me a human body! I boy with Blond hair and tan skin, dead or alive"

WAIT WHAT!? IS HE CRAZY!?

"I'm an insane dream demon"

This dude, or Dorito... Lol.

"Fine deal, but what do I get"

"Anything!"

Hmmm... I know!

"I want to know how to navigate this forest!"

"Deal"

I grab his hand and a blue flame appears but then it turns pink. Weird.

I walk back home thinking of this deal, did I make the right choice?

Bill POV

The flame turned PINK!!! Does that mean that I'm bound to her? Like that human emotion called love? Oh no...

I float around the forest mindlessly. I then see a kid on a roof of the mystery shack. Oh, sixxer used to live here before he disappeared, I teleport behind the kid and see he has journal 3.

"Hey, their kid!"

He yelps and turns to me.

"Yo-your the demon in my journal!"

"Ding, Ding, Ding, Pinetree!" Bill said flying up making confetti appear

"What do you want!?" Dipper asked angrily

"I want nothing more than a good ol' deal"

"What do you want?"

"I want you to not fall for Y/n" Bill said innocently, Dipper shot him a confused face.

"Wait, what?" Dipper asked

"I don't want you to fall in love with her Pinetree, if you do there will be consequences" 

"Ok ok! I want a series of mystery and crime books" He said, why not, nothing too bad.

"Ok then Pinetree"

Bill put his hand out and Dipper shook it, the flame appeared and then Bill disappeared.

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End of Chapter 1