Bill immediately snapped his gaze toward the sound, and you could see a tint of red beginning to replace the yellow of his body. You stepped away from him, not wanting to be in the blunt of his rage.
Four figures emerged from the darkness, red light bathing their features darkly. Each stood with their own weapon of choice, and the old men's glasses glinted menacingly.
"What. Are you. Doing here?" Bill snarled, floating in front of you protectively. You stayed silent.
"What do you think?!" Ford retorted, holding up a glowing gun. "We're here to stop you!"
"Yeah, you isosceles freak! You thought we wouldn't be ready for your next apocalypse attempt?!" Stan said, holding up his fists decorated with brass knuckles.
Bill let out a screech that echoed around the cave, forcing everyone to cover their ears. His hands were on fire, the blue light conflicting with his red glow. Bill snapped and raised his hands up, attempting to bring forth something from thin air. But nothing happened. He looked at his hands in even more fury than before. "DAMN RULES!" Bill screamed, his fire getting larger. "OF COURSE I HAVE TO ABIDE BY THAT ONE LAW! I WOULD DESTROY THIS WHOLE WORLD IF MATTER COULD BE DESTROYED OR CREATED!"
Ford raised his gun and cocked it, ready to fire. Dipper and Mabel had their weapons at the ready and Stan was prepared for Bill to attack.
Bill looked at you, inverted pupil staring directly into your eyes. He held out his hand, the flames dying down. "(Y/N), we're leaving. And getting as far from them as possible," he said, his tone still holding anger, but it wasn't directed toward you at all.
You had a hard time replying, and could barely get the words out at all, but you eventually spoke, "I'm... I'm not going with you. I can't trust you anymore."
The heartbroken look in Bill's one eye after that statement almost brought you to tears. It was so intense, so saddened, you could almost hear the shattering of his heart. You could see undeniable, unfathomable rage beginning to well up in him, the red glow beginning to blind you; yet he failed to utter a word or muster a move. The four shifted from behind Bill as he began to reach out his hand toward you, clearly to take you with him by force. However, he stopped. Bill flashed a blinding blue and disappeared, a loud snap following.
Ford, Stan, Dipper, and Mabel all ran over to you, Dipper catching you just before you fell to your knees. You felt horrible. You had just betrayed him. The guy you spent an entire month with, the guy who said he loved you, you betrayed him. The conflicting voices arose in your mind again, one screaming indescribable words of pure hatred toward what you just did, the other quietly trying to input logic, but it seemed to succumb to your feelings.
"(Y/N)..." Dipper whispered, pulling you back to your feet. "I... I know it was hard for you..."
"Hard for me?!" you snapped, pulling yourself away from Dipper. "You didn't see that look he gave me! He... he looked heartbroken! To think he had broken my trust! I... I pretty much broke him! Why did I have to listen to you..."
Mabel sighed, and walked over to you. She put an arm around your slumped shoulders. "Hey, I know this is really beating you up. But you can't snap at Dipper like that. I know he can be hard to get along with, considering he seems to take after great uncle Ford's lack of serious empathy-"
"Hey!" Ford yelled, earning him a punch in the arm from his brother.
"- But he did what he thought was best for you. What we all thought was best for you. It's not just Dipper and Ford who's had encounters with him, you know."
You looked at Mabel, your eyes filled with tears, "Wh-what...?"
"When he caused his first apocalypse... or Weirdmaggedon... he used my unwillingness to let Dipper stay back in Gravity Falls with Ford to his own advantage. He stole one of our friends' bodies and tricked me into giving him a rift which he broke mere seconds after. A tear between dimensions was opened and he trapped me in a bubble. It was my own personal paradise. Everything I loved was there. But it was missing something. Then Dipper and our friends came in and found me. I thought I had everything. My friends were safe, I was able to actually live in my own world with whatever powers I wanted, and summer would last forever with my brother. Until Dipper finally convinced me that the real world was outside of Bill's bubble, and the real world sucked. But you know what? You can make do for yourself there. Bill's known for using desires to his advantage, and he probably knew about your ex. He sort of put you in your own bubble. It's true he might have grown attached," Mabel said, earning a sniffle from you. "But he still needed you for something. I wouldn't put it past him to use his attachment to you to convince you to bring about another apocalypse. And then you would have the entire fate of the world resting on your shoulders, and if worse comes to worse, he would have trapped you. It's clear to see with how protective he's become of you that he would never kill you. But Bill just... he doesn't understand the difference between loving someone and caging an animal. And Dipper wanted to save you from that, alright?"

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Zigzag Logic (Bill Cipher X Reader)
Fanfiction(Y/N) is a total science nerd, skeptic, and complete disbeliever of the supernatural. She lives in Zigzag, Oregon with a miniature, one-person research facility that she runs. And after having a particularly bad experience with a former fiancé, she...