A cold and soft breeze hit his skin.
The quiet sound of rushing in the distance grazed his ears.
His fingers could feel a flat and smooth surface he was laying on, cool to the touch, wet and soft.

Dipper opened his eyes and looked up at a light bathed sky.
Bulgy and snow white clouds floated over him, softly blown by the wind like sailing ships of cotton.
Slowly he turned his head to one side, still speech- and motionless.
And what he saw send a tingling chill all over his body, unclear if the mere sight was freezing or overwhelming him.

A silent and endless sea reached over the entire horizon and touched the sky, almost melting together with their clear azure color. The traveling clouds were reflected almost flawlessly in the tender waves as if it was a giant silver mirror.
And Dipper laid directly on the surface.

Where… am I? he thought by himself with a quiet voice inside his head, not daring to speak or move yet.

Was that a dream? Another world?
Everything was so clear and right there. The sky, the sea, the breeze in his hair and the slight rushing in his ears. But yet again it felt so strange. Like his senses would just play a trick on him.

Somehow Dipper could bring his limbs to motion that seemed so feeble before. As if his body was still asleep. He stood up with his feet on the solid water surface, slowly and carefully. But as soon as the young boy brought himself up and looked around to search for an actual shore he saw that he wasn't as alone as he first thought.

A blue colored and flat triangle floated there over the sea, just a few meters away from Dipper and almost blurred within the sky's color.
Its only eye was closed, its black limbs were hanging down motionless and a black hat hovered just above its top along with a tie in the middle of flat bricks.
Bill!
Was that Bill?!

His name rang through Dippers head like a set off alarm as he stared up at the ghostly form, his body tensed.
He opened his lips with a soundless gasp as he wanted to call out for him.
But all of his actions stopped with a held in breath as the triangle slowly opened his lid and looked down at him with that calm and almost sleepy eye.

"I heard you prefer to get called by your nickname which is connected to your facial birthmark", the triangle said with an even and quiet voice, a silent whisper filled the air.

"Do you wish for me naming you like that as well?"

Dipper stood totally still with his lips parted speechlessly, his breathing almost forgotten. His head was completely empty and overstuffed with thoughts and questions at the same time, the words of his counterpart just rushed through him meaninglessly.
But he could manage to give a single nod.

"So be it. 'Dipper Pines' it is then", it answered after getting a positive response, slightly floating closer towards the young and still confused boy.

"Who… who are you?", Dipper asked almost soundlessly before swallowing down the dryness in his mouth.

"I am the one you have summoned with the ancient incantation, about 1 hour, 26 minutes and 45 seconds ago."

"H-Huh? Wait… so it IS an old spell? And-And I thought it had no effect at all…", Dipper said in surprise and touched his forehead, almost forgot about the risk he just took a little while ago.
First it seemed like it had lead him to nowhere.
And now he's here, it really worked!
But was that a good thing?

"Negative. In fact, you are the first human being after almost 2342 years who have found and read aloud the old evocation."

"But… Who the hell are you now? You… you look almost exactly like Bill!"

Dipper took a step back from that one-eyed demon in front of him, slowly getting anxious that he just got pulled into a big deception before getting possessed and terrorized again.

"Is that you, Bill? You won't trick me again, I'm telling you! I won't fall for this!"

"'Bill Cipher'…", the triangle repeated in a low voice, its eye lid half closed with a slight glance of dismissiveness before looking away.

With a silent hovering it passed the still wary Dipper who would keep his eyes glued to the blue shape, stopped as he had turned his backside to him.

"Technically you are not in the wrong, child. We do share the same knowledge and power…", the demon went on, his counterpart listened closely.
"Once we were still together as one inexplicable being that watched all single proceedings on your world and beyond, older than the galaxy your kind is living in. But somehow those thoughts emerged. Thought about 'desires' for more. For actions and influence, for an identity and a fingerprint in the universe. For… 'fun'."

Slowly the triangle turned around to face Dipper again, its expression still as calm as before while the young boy tried to follow and believe its words.

"That was the beginning of our segregation until we were parted from each other completely. And since then he had left me between the galaxies and followed his plans, interacted with other creatures and gave himself a name and an identity. That is the 'Bill Cipher' you and your family know."

As the blue form seemed to be finished with its explanations, Dipper dropped his gaze at the watery ground under his feet, trying to order everything he just got told.
Was any of this really true? Would Bill actually go this far to play a trick on him?
Dipper wanted to doubt that. And somehow… he felt like he could trust in those words.
This place, it made him feel like nothing he had ever felt before, not to mention his experiences with the triangle's yellow counterpart.

"So wait a minute…", Dipper started after minutes of thoughtful silence,
"You're telling me that you yourself are Bill but… not exactly him, more like a part of him. Something like… like a leftover he wanted to get rid of once? Because he wanted to make deals with people and spread his chaos?..."

"If you want it to put it that way, yes."

"Wait… of course! The green triangle! That was actually the ultimate form of you two combined, right? And the summoning spell was the first one ever written, right? Right?"

Dipper's eyes went wide with a growing smile on his lips as the realization let his heart skip a beat, exited over the secrets he seemingly just had unfolded and let him forget any disbelief.
The triangle, however, didn't seem like it would understand why the kid got so jittery all of a sudden and it blinked one-two times.

"Yes… Yes, that is correct."

"Oh my god, oh my god, this is incredible!", Dipper said to himself and couldn't help his eagerness, started to pace up and down,
"That old cavern, the ancient writing. Gruncle Ford was right! It was the last key we needed! Now we know what Bill's origins are and that there's actually more than just what the paintings were telling us and now we can find out so much more and if we could figure out just a little more we could actually find a way to end all of Bill's madness and prevent the end of the world and- and and…"

The exited boy stopped to catch his breath and to calm himself down again.
But he couldn't believe what a huge step he just did by finding out that Bill actually has another half of himself, remains that were forgotten and nobody knew about till this day.
Sure, there was no guarantee yet that this could actually help them out with all their problems but the possibilities were right there.
Dipper took a few deep breaths before facing the dream demon again who would just have floated there without saying a word or giving any clear sign of emotions.

"Ahem…", Dipper cleaned his throat after talking like a faucet and scratched his head,
"Sorry, I got… carried away a little on that I guess. Sooo, what was your name again?..."

"My name? I have no name I could get called by, child", the demon responded as it would be the most obvious thing ever.

"No name? But… how is that possible?"

"Names are just used by assemblies of creatures who had developed a verbal language to communicate and to mention a certain counterpart or object in their speech. I, however, am alone in my being and do not have anyone who would call me by a name."

"Uhm… I see…", Dipper responded with slight confusion but could manage to catch up with him in some way.
"But… I am a 'creature with verbal language' so… maybe I can just give you a name?..."

"If that is your wish. I have no influence in that decision of yours, child", the triangle responded with his even voice, clearly not caring if Dipper would just give him a name by himself.

So why not?

"Well then… If your other half called himself 'Bill' then…", Dipper started to think and kept his eyes on the still nameless shape.

"How about… 'Will'? 'William' for a better separation?"

"So be it. 'William' it is then", the baptized responded.