Time has gone by, and the mystery twins are already 21 years old. Both Dipper and Mabel are academics, Mabel majoring as a fashion designer, currently studying as an exchange student in Paris, while Dipper was majoring as a Codicologist. Ever since founding the 3rd journal, he knew that was his path and after meeting Bill Cipher, he wished for the wisdom and secrets of the universe.
Every summer break he would go to Gravity Falls to investigate new mysteries. He would work part time in the shack and spend the rest of the day wandering in the woods. Bill, since he was younger, would appear now and then to accompany him while playing pranks on him or simply bothering Dipper. Dipper would plug himself with his earphones listening to music, but Bill, being the demon he is would travel through the sound to whisper in Dipper´s ears, sometimes telling him grotesque stuff, sometimes mocking him, and some other times he would talk dirty to him. This last one always left him shivering in sheer disgust while imagining it.
But as time passed, both really started to grow used to it. It was some kind of a routine, even Bill (who´ll never admit it) enjoyed the company of Dipper and whenever he was bored he visited him. While Dipper always talked nonstop about his theories and cryptic stuff he listened intently, and since nobody wanted to listen to him, Dipper found it reassuring having someone to relieve his mind.
This year, Dipper is really looking forward to meet with his "friend". He is almost nervous while thinking if he will greet him home or at the woods by surprising him. Since a day ago while packing his stuff Dipper couldn´t stop thinking about Bill.
-Relax Dip, relax man- he thinks to himself as he knows he is almost in Gravity Falls.
Suddenly his phone vibrates with an odd melody, not his usual ringtone as he receives a message from an unknown number. "Hey Pine Tree, guess who?... I´ll meet you at the bus stop near the shack by midnight got ya a surprise, pal" Dipper is speechless, it´s the first time he receives a message from Bill, he didn´t knew he had a cellphone, his stomach flutters a bit at the thought of seeing him, it´s been a year after all.
Dipper arrives at the shack and is happily received by Grunkle Stan, Wendy and Soos, he enjoys a nice get together with his friends and unpacks his stuff at the attic, his and Mabel´s room. When everybody goes to sleep, he finds himself nervous, and bored, he can´t wait until midnight so by 11:30 he is already leaving the shack, walking to the bus stop.
It´s 11:45 when he arrives so he plugs his earphones and listens to some Indie Rock band as he closes his eyes, leaning at the bus sign. A mystical breeze blowing his hair, he is humming the song somehow distant when suddenly a freezing hand covers his mouth and another one covers his eyes from the back. Whoever it is, is strong because he can´t move, he only whimpers.
Soft cold lips brush against his ear and whispers huskily "Guess who? ... Pine Tree" Dipper shivers, his knees almost giving in. He recognizes the voice, but it can´t be him, he is ethereal. Dipper touches the hand covering his mouth and gasps, it is soft and cold, but it feels like skin. "Bill?" he stutters into his palm and he is suddenly jerked away and turned around by strong arms.
His mouth drops open for in front of him is a man perhaps in his thirties, all sharp angles and really really -sexy?- Dipper blushes at the thought, this man is handsome, his blond wild hair covers one of his eyes, but that other eye, glowing golden, it entrances him, and that trademark black hat, plus he is wearing an elegant suit a combination of yellows and black. It is unmistakably him. Bill Cipher the demon.
"Bill… what, how are you…wow man…" Dipper runs a hand through his hair staring at him.
"Ta dah!" A wickedly smiling human-Bill moves his hands up and down pointing at himself.
"Am I too perfect I left you speechless" Bill clutches Dippers shoulders shifting his weight on him as he winks sensually at Dip who blushes in a surprised face.
Dipper looks away from Bill and removes him. "What happened to you Bill? Why are you in a human form?" He is obviously bothered by this fact.
"Well while you were gone I did some research in a lot of places as to how I could be more… tangible and to make it simple I found this enchantment which allows me to be human but only in the night. Crappy huh! " Bill said while grinning happily, showing him pointy teeth.
Dipper still couldn't believe what he said. He smiled slowly and crushed Bill in a tight hug barely lifting him. Apparently Bill was taller with broader shoulders.
"That's awesome man now I can actually touch you" Bill swallowed hard, it was his first time having human contact, actual contact, and he found it intriguing. It was a nice sensation and when Dipper moved away he felt a small void in him.
They spent the night chatting about mysterious stuff, Bill telling Dipper about his research and Dipper taking mental notes about this enchantment, walking by the woods, to the shack. They ended at the roof of the shack staring into the stars, sitting side by side while speaking nonstop, playing with each other, laughing, catching up with what has happened in their lives.
Bill would take every chance to touch Dipper, his hand, bump shoulders, lay on him, and tug his hair. He relished it a lot.