Sans AU One-Shots

Horror || backrooms.

Pairing: Horrortale Sans x Female Reader
Prompt: In a blink, Undertale is replaced by a starved, crazed version of the Underground where we're on tonight's menu - or, we would've been if we hadn't run into a creepy skeleton with an eerily wide smile. Sans may have given up a long time ago but he's not stupid, and while he gives the human bodies he finds to his brother to cook for the monsters of Snowdin to eat, he hasn't given up completely on breaking the barrier to give his brother the happy ending he deserves. And look at that, 4 human souls just walked right into his trap, which is 1 more than he needs.
Type: mystery/reveal, real people in fictional world, established friendships being tested, Red is hiding something...
Length: 11.4k words
Background: This was a joke idea between some friends of mine inspired by the question 'what if we fell into the backrooms, but instead of the backrooms, it was Undertale?', and from there, I predictably got ideas and wrote a thing (or multiple). It turned into a small series (oops) | You enter the backrooms by being in the wrong place at the wrong time and 'clipping through reality', so-to-speak. How unfortunate that it would happen to us twice and take away our happy ending...
Notes: Warning for all the usual suspects in Horrortale, which include: blood, gore, dismemberment, death, cannibalism, and disembowelment. | You're actually in the action this time, not discussing what happened after the fact. | This was also written a long time ago, I only just got around to editing it. Can you tell I just don't have the inspiration I used to anymore? 😅

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"Pop the doors!" I shouted ahead of me, watching Blue and Yellow each take a door and ram their shoulder into it, bursting through to the other side and hitting Purple and I with a blast of cold, crisp air. My breath fogged in front of me and I glanced back, spotting Purple lagging behind as her legs threatened to give out, and I beckoned her after me as my own lungs screamed in protest. "We're almost there!"

"Come on!" Yellow yelled in a staccato, unnatural rhythm from speaking a language he barely knew. He and Blue held the doors from the outside, the frost nipping at their exposed skin, but their attention was focused on us as we raced down the Ruins' halls. I flew past them, sliding in the snow as I tried to turn around, only to freeze when I spotted a fireball lighting the walls behind Purple.

"Behind you!" But my cry was too late, as the second she glanced over her shoulder, the fireball was thrown her way. I could imagine my skin burning as the smell of cooked meat permeated the air, but Yellow was already darting towards her, tackling her to the ground in the nick of time so it sailed over them and landed in the snow with a sizzle.

"Come back, children!" the goat woman shouted, her yellowed eyes crazed as she smiled too wide and ignited another ball of fire in her outstretched palm.

"Let's go!" I took Yellow's place at the door as Yellow tugged Purple to her feet and pushed her towards the open doorway, shouting at her to move in Polish. The second their feet crossed the threshold, Blue and I rammed our shoulders into the stone doors to force them shut. They creaked in protest while our feet slipped in the snow, and I planted my back against the door, shooting a desperate glance Blue's way as he met my wide eyes and dug his heels into the ground.

"I thought Toriel was nice?" he muttered, nearly cracking his shoulder against the stone as he gave one final heave against the door and it closed with a resounding bang.

"Not this one," I replied, feeling the stone scrape my shoulder blades as I leaned against my similarly closed door. I took the chance to catch my breath while it supported my weight, glancing around Snowdin forest with my back to the Ruins and the crazy goat lady in this alternate version of Undertale. Purple had her hands on her knees, half bent over as she gasped in air, and Yellow rubbed her back, more concerned with her well-being than where we were.