A/N: Okay, I may have some kind of idea as to where this fic will lead up to!

Trigger warning: Bill will be having sadistic and abusive tendencies. Whether or not he will act on those tendencies, I'm still not sure.

Enjoy!

Nights at Gravity Falls prove to be unbearably frigid compared to their sweltering days. Bill never really noticed it until the very moment Mabel had refused to let go of him on the bed, obviously seeking warmth from his body. It's baffling how deep in slumber she was but had still managed to maintain an iron grip on Bill's shirt. It literally took him fifteen minutes (or perhaps longer than that) to be freed from her clutches and much to his relief, the girl barely moved from the bed.

Bright blue eyes stare right back at him as he brings up his fingers to feel his cheeks, finding his own reflection doing the same. Being in someone else's body feels too good to be true. In fact, being in Will's body feels a hell lot better than being in Pine Tree's body. He had long taken his shirt off to expose lean muscles, something he's certain that Pine Tree doesn't have even though he hasn't seen him yet. But come on, those noodle arms are of no use from the start. He doesn't even want to be reminded of the sensation of the tremendous physical weakness that kid has. Just when he's about to reach for the small splotch of birthmark located near his collarbone, he finds a long scar imprinted on his right palm.

He looks down at his hand, his left hand coming up to run his fingers over the scar's ridges and its jagged edges. Gross. How did this happen? Shrugging it off, Bill focuses back on the full-body mirror in front of him while still keeping tabs on his 'girlfriend' whose reflection could also be seen from the mirror. He bites on his lip and takes in his appearance again. He runs his fingers through his unruly slightly curled blond hair, his fringes revealing his forehead where a birthmark that almost looks like a star could be seen.

In contrast to his lean body, his face looks fragile. He has that choir boy look going on and frankly, Bill doesn't know what to think of that. At least the black stud earrings make him look less like a kid.

He puts his shirt back on and opts for the drawers, hoping he could find his stuff and learn more about this guy's life. Unfortunately, he couldn't figure out which stuff are his and which are Mabel's. In spite of living for thousands of years now, he still couldn't find it in himself to fully figure out all these gender norms humans have. He picks up a Japanese comic book, raising a brow at the cover that shows two drawn boys getting frisky in a closet. Now this has caught his interest. He carefully flips through the pages, but then eventually gets bored and puts it back down.

Been there, done that.

After a few more minutes of thorough search, he eventually finds a black leather wallet hidden under pairs of boxer shorts. He opens it without a trace of thought and manages to find a driver's license with his face—Will's face, if you wanna get technical—on it.

"Bingo." He murmurs with a wide grin.

So from now on, he will be going by the name of William Dudson; a twenty-four year old obvious photogenic. No really, Bill has to admit the guy knows how to look good on an ID. He slips the card back and proceeds to scour through the wallet, only coming across a few credit cards, some cash and a small piece of paper with Will's name on it for some reason. Bill clicks his tongue in annoyance before going through the drawers again.

He then finds a magazine with Will on the cover.

'Top 15 Hottest Eligible Bachelors in California!' can be seen printed on the cover in large red letters. Well, fuck. Mabel has really scored, huh? He always figured she will anyway considering the abundant amount of effort he had seen her put into achieving that summer romance she had always craved for at such a young age. Bill picks the magazine up and flips through the pages until finally coming across the one he's looking for. An entire page displays a picture of Will looking all prim and proper in a well-tailored suit as he shakes hands with some guy whose face doesn't make it to the shot.

Name: William Dudson
DOB: July 12, 1996
Height: 182 cm (6'0)
Weight: 70 kg

The heir to the grand Dudson Conglomerate, William—or Will, as he prefers to be called—isn't just all about going to valuable meetings and shaking hands with influential people. During his spare time, he takes genuine delight in painting. His first show was set up at the remarkable Museum of Contemporary Art in Chicago and from there, his side-career as an artist has skyrocketed! He's now currently working on four pieces for Hearst Castle and a few more which he has decided to keep under wraps for now. An accomplished artist and heir to an affluent group, it is indeed a huge shock to everyone that he's still single!

Bill promptly stops reading from there when he hears Mabel shifting on the bed behind him.

"Will?" He fights back a flinch upon hearing her sluggish voice. He looks back over his shoulder, making sure the magazine is hidden from her line of sight. Mabel had sat up from the bed as she looks at him with an inquiring yet sleepy look. "What are you doing? Come back to bed. You're not gonna have a good morning if you don't get enough sleep."

The urge to protest and tell her to just go back to sleep tempts the demon, but then he figures that's probably something Will wouldn't do. Based on his fleeting encounter with him, something tells him the guy isn't that much of an authoritative person. He's more of an annoying wimp if anything, really. Bill bites back a sigh and carefully slips the magazine back into the drawer before straightening up and heading back to bed. Mabel lies back down, her brown hair fanning across her pillow and her hand stretched out to meet his.

Holding hands on the bed? This girl is seriously giving him diabetes.

But what can he do? Will would have most likely held her hand in this situation and Bill honestly can't afford to raise any suspicions right now. He fights back a grimace as he reaches for the girl's hand and finds it in the darkness, accompanied by the radiance of the moon spilling through the window. Just having her skin against his is enough to have a cold repelled weight settle in the center of his stomach. Gorgeous or not, this woman is still one of the reasons why he had spent years in the old man's mind and thinking about that just makes his blood boil.

He'd smack her if he could.

But that will have to wait. Besides, it's those two old men and her brother that really piss him off. They will be his main dish and this woman will merely be his side-dish. In fact, she'd make a nice whore once he has the power to hold the reins of the universe. Yeah, he should take that into consideration.

"What were you doing over there?" Mabel asks as Bill lies down beside her.

"Stuff." He shrugs, hoping his brief answer would lead her to think that he's too tired to talk. Luckily, it did.

He feels the brunette moving closer to him and he gets a whiff of her soft green apple scent.

Wow, that's nice.

"See that fine young blonde in a purple dress? That's Pacifica."

Will follows his father's gaze to see the Northwest heiress speaking to a few other elites who appear to be around her age. He swallows uncomfortably. If Pacifica is aware of each false step in her course of existence, then it's not laid out for everyone else to see. All in all from the way she holds herself, to the way she puts her thoughts into words, to that manner of unequivocal firmness in her dark cerulean eyes said she could do anything without a hitch. It's overwhelming, to say the least. Will already doesn't feel particularly comfortable being in a soiree to begin with.

And yet his father still expects him to court the blonde heiress?

He holds a deep intake of breath as his father gives him a clap on the back. "You can do it, son. The feud between the Northwests and the Dudsons can finally be put to an end as soon as you reel her in."

Will suppresses the urge to point out how ridiculous his father sounded whenever he refers to a girl as some meat they could catch. "I don't know…" He rubs his arm uncertainly. "Can't you just try to talk to her father?"

"We've done that, William. Nothing goes through that man's thick skull. Ah, look. She's alone now. Now's your chance."

Before Will could have the chance to protest, he's quickly nudged towards Pacifica's direction. He swallows again. He could feel his hands getting clammy. He couldn't think straight and his brain is constantly searching for other people to hopefully approach Pacifica and steal his chance of ever having to interact with her. He glances back over his shoulder to see his father now fixed on talking to other people much to his relief.

At least that's one pressure off his shoulders.

But just as he looks back, he suddenly finds himself colliding against a petite frame. Or to put in better words, a girl practically throws herself in his arms in the sloppiest manner possible. The harsh scent of alcohol engulfs his senses as the girl in his arms struggles to keep her balance, her hands coming up to tightly grab his shoulders for stability.

A shameless laugh bubbles out of her mouth and she looks up at him, her grin meeting her chestnut-hued eyes. "Whoops, I think I just fell for you! Ayooooo!" She laughs again and slaps his chest. "I'm just kidding! I'm just really naturally charming!"

Will blinks in surprise, not entirely sure what to do. Some people are looking at them with bewilderment but luckily, his father still appears to be too busy bragging about their wealth to notice anything. Pursing his lips, Will helps the girl stand steadily to her feet as his eyes frantically scan his surroundings in search for her family or her friends. He's never seen her before. He always attends important soiree's such as this one but this girl is new.

"Um, who are you with?" He decides to ask instead. "I could take you to them. You're obviously intoxicated and—"

"Oh, don't worry about me!" The girl pats his cheek and he recoils a bit. "I just had a little bit of fun juice is all! But if you reeeeally want to know, I'm here as Pacifica's plus one! She's busy talking to other rich people though and the buffet table was open so—" She abruptly stops her chatter, her smile fading. "…I feel sick."

Shit.

"O-Oh…! Err, the comfort room is over there. Just turn left—"

"No, I need you to take me there. Now!"

"O-Okay…!"

After another fleeting scan of their surroundings, he takes the girl's wrist and leads her out of the room and to the corridor. He could hear the girl moaning and groaning from time to time and he picks up his pace. The last thing he wants right now is to have her throwing up all over the corridor or him. Especially him. His father would be more than furious if he gets this suit stained. Goddammit, why does he have to go through this now? He never wanted to be here in the first place.

"Oh God, I don't think I can make it…" The girl squeezes his arm. "I…"

"We're almost there."

The morning sky is a soothing, watercolor blue with clouds dyed pink where the fresh new sun has adorned them with its radiance. The air is damp but rich with the fragrance of leaves and loam. Bill still finds it so surreal that he's actually back and he never thought he'd be this happy to be in this hick of a town again. But what the hell is up with his dream last night? It seemed like a clear memory of Will. Huh, that's new.

He could hear the shower running from the bathroom nearby, realizing just now that Mabel isn't lying beside him anymore. Taking her absence as an opportunity, he hastily gets up from the bed and walks over to their stuff again in hopes of finding out more about his body. Though, this would have turned out to be a lot of easier if he has most of his powers back. He could have just easily flipped through Will's memories instead of just dreaming them up every time he's in slumber. He catches sight of a shoulder bag laid on the desk nearby and makes a grab for it, not wasting any more time as he looks through its contents.

He fishes out a cellphone.

Perfect.

Putting away the lockscreen, an image of a smiling Mabel on a picnic mat flashes on the screen. Bill disregards it and opts for the messages, scanning through every note he finds. There are a few messages from Pine Tree though most of their interactions are about confirmations of when and where to meet up. The last one is about meeting up at the Mystery Shack for a week-worth of vacation, which is probably why they're here. There are also a few from unfamiliar names but when he comes across Mabel's, he taps it open. He cringes at the sight.

So apparently, he will now have to call her either 'babe' or 'pancake'. Can this relationship get any lamer?

Obviously it can.

Because they also sometimes call each other Mr. and Mrs. Potato Head.

What in the ever-loving fuck?

But then a debacle of a different nature meets his ears. Someone's knocking on the door. He shoves the phone back into the bag and makes his way to it, scratching his stomach under his shirt as he does so. He pulls the door open and much to his pleasant surprise, Pine Tree stands before him. Much like his sister, Dipper has grown into a fine young man. Dark circles are evident under his eyes but they turn out to be endearing on him. He's rather lanky but that is to be expected. He looks very much like his sister, though it seems height didn't do well for him. Bill could easily guess the twins are of the same height, making him tower over the brunet.

"Hey, man." Pine Tree gives him a small casual smile. "How did the experiment go last night?"

Bill grins at him. "That's for me to know and for you to find out. You're pretty swell with the latter anyway, aren't ya?"

"Pssh," Pine Tree chuckles. "I know you won't shut up about it later. Anyway, I just came here to tell you that breakfast is ready. Candy wouldn't let us eat unless everyone's at the table."

"Oh, gotcha." Bill makes a shooting gesture with his hand as he gives him a wink. "Just give us ten minutes, Pine—" He stops when he notices that the sound of shower has ceased. His grin switches to a devious smirk. "On second thought, give us longer than ten minutes. It depends on whether or not I get to have a morning fuck with your sister."

And just like that, Pine Tree's smile drops. "What—"

Bill slams the door shut to his face and snickers.

"Sucker."

"Who was that?" Mabel's voice catches his attention and he turns around to see the brunette stepping out of their bathroom, a pink towel wrapped around her body and her hair still slightly wet but obviously dried by a towel.

"Your brother. He just wants us to know that breakfast is ready."

"Oh, nice!" Mabel beams at him. "Candy told me she'll be making breakfast today. You have not lived until you've tasted her cooking." Then, as though she's done this a lot of times before, she casually takes off her towel and drops it to their bed before heading over to the cushioned chair nearby where her fresh clothes are laid.

Bill shamelessly takes in the sight.

Delicately slender with a face that can be somewhat too soft, Mabel could have easily manipulated any being from every dimension with practiced seduction. Including Bill. But luck is on his side for he knows she's too thick-headed to be aware of what she can be capable of. As he watches her put on a pair of frilly baby pink underwear, he licks his lips.

Yep, I can live with this.