Choosing this one first, I see. Glad to know the human race is in good hands. (Warning, this and the other chapter are going to be SUPER LONG. I wanted to make these super well-written, but that was at the cost of me not thinking how long these are actually going to be. So what would normally span between a few chapters is now one really long chapter. Have fun~)
Here you were. One more ridge to climb over and you would be practically in Bill's face. You climbed diligently, full of purpose and determination. You knew exactly what you were going to do the moment you got up to the rock Bill should be on top of.
You were going to help him.
You climbed over the ridge and beheld a sight that would have given anyone a heart attack. Etched into the snow were arcane runes surrounding a satanic-looking circle, a triangle being in the middle. Instantly you recognized the glowing geometric shape that was Bill Cipher, and you hurriedly climbed down the rest of the ridge, tripping and tumbling the rest of the way.
Bill must have heard the dull fuff coming from your impact into the snow, as he turned away from whatever incantation he was performing to look back at freezing, snow-covered you. You were shaking, not from fear, but from near hypothermia. You began to realize how little energy you had, as you could barely lift your head up and out of the snow to look back at Bill. Your hat was frozen to your skull, and your jacket made horrid cracking noises as you slowly got to your feet to stand, pale and exhausted, before Bill.
Bill's one-eyed expression was... curious. It seemed like a worried look. Like something you had done had scared him. Neither of you spoke a word for what felt like eons. You just stared at each other.
You were the first to speak, "Bill, let me join you."
Bill instantly looked surprised. His pupil narrowed, looking at you suspiciously. "You? You want to join me?" he asked, suspicion dominating his tone, but morbid curiosity lined the edges of his voice. "Why the sudden change in attitude, hm?"
"I'm... I'm sick of being treated like some sort of pet. Everyone wants me to do exactly what they say while they pat my head. I would prefer to rule over everyone else," you responded. You could feel the cold creeping up your spine, but you ignored it.
Bill chuckled. It was that familiar "you're cute" chuckle he had picked up. But it seemed forced. "Do you really think you'd be up to the task of even witnessing the things that will happen, (Y/N)? They called it Weirdmaggedon for a reason," he said with a slight air of pride. "Not to mention my friends aren't too keen on humans."
"You're keen on me. I'm sure if you tell them that I'm part of this whole thing they won't mind," you persisted.
"Someone's being persistent," Bill chuckled again. "I guess I could. I do still love you, despite the fact you broke our deal."
You looked at the ground as a violent shiver ran down your body. Bill looked at you.
"Oh no..." he muttered under his breath.
Bill floated closer to you, looking you over and examining every part of your body. It was exceedingly uncomfortable. He looked you in the eyes and examined those for a second. "Maybe you could handle it..." he muttered, more to himself than you. His large, singular eye was uncomfortably close to you, and you had to avert your gaze. Bill just tsked and grabbed your chin, forcing you to look back at him. He continued to look into your eyes.
"Th-this some sort of staring contest?" you stammered sarcastically through your rapidly freezing body.
Bill laughed a little, completely unconcerned about the hypothermia creeping its way to your heart. "Not particularly. Just looking to see if you could handle what I'm about to do to you," he responded eerily. Almost instantly you were overwhelmed with an onslaught of particularly... gross thoughts. Bill turned a shade of magenta. "N-not that you doofus! I'm not even human anyway!" he squeaked, unintentionally squeezing your chin rather tightly. You let out a whimper and he let go. "Sorry."

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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...