Bill Cipher X Reader & OC

Human!Bill Cipher x Reader (Part 1) - It's a deal

You were on your way to the Mystery Shack to visit your best friend Dipper; he had promised that you two would spend that day together.

As you opened the door of the old wooden house, you were only welcomed by silence. How come that nobody was there? Is the middle of the week, usually they will be working right now.

But your thoughts were interrupted by the sound of someone falling down the stairs and a laugh. You quickly got to the stairs that connected the attic with the living room, only to find Dipper laying on the ground and laughing.

You blinked a few times just to make sure that you were actually seeing that. "oh, hey (y/n)~" "uuuhhhh... hey, Dipper... you okay buddy?". He got up from the ground "of course~ I never have been better on my life!" and with that said he started skipping to the kitchen while giggling like a Japanese highschool girl.

You just stood there, too stunned for words. But you snapped out of it when you heard Dipper laughing again. As you entered the kitchen Dipper was hitting with his head on the fridge door, still laughing "hahahahaha! Pain is hilarious!!!" "since when did you became a masochist?" "what~?"

When he finally stopped hitting with his head and looked in your direction, you noticed that something was wrong. His usually brown eyes were now yellow with cat-like pupils. And you knew that eyes from somewhere....

"Bill!? What are you doing to Dipper's body!?" The goofy smile in his face quickly changed to a smirk "I already knew that you are smart but I didn't think that you would figure it out that easily, especially when the others didn't"

Furious, you grabbed him by the collar of his shirt "you bastard! What  have you done to Dipper!?" He raised his hands in mock defense "calm down, kid. Let's just said that I decided to make Dipper my new puppet"

Your grip on his shirt grew stronger "You better let go of Dipper or else!" "Or else what? Are you going to slap me? I wouldn't mind that tough, I love feeling pain~"
You stopped to think for a moment. There is no way you are going to beat him up. He would only enjoy it and in the end you would be hurting Dipper's body. Right now there was only one option left that you could think of.

You let go of his shirt "Hey, Bill, you like deals right? Then let's make one:  you leave Dipper alone and I give you something that you want."
"uuummm.... I let go of the Pine Tree and you give me something that I want.... Only if you promise that I can choose anything." "anything you want" you said and extended your hand for him to shake.

"sounds good to me, let's do this!"As you two shake hands, a blinding light fills the room for a few seconds. When the light disappeared you saw a blond guy in a suit, flouting, and an unconscious Dipper laying on the floor.

"Dipper!" you kneeled down next to him and noticed, relieved, that he was breathing. "Now for the second part of the deal~" Bill said with a mischievous grin.

You sighed "Right. What do want?" He started looking around and pointing to things as if choosing "Umm, let's see: eenie, meenie, minie.... YOU!!"
Your eyes winded "Me!? You can't have!" He smirked and put an arm around your waist "But my dear (y/n), you promised I could have anything~"
"Oh shit...." Bill chuckled at your response and leaned to your ear, whispering:

"It's a deal, then"