Undertale: the flame that binds us (sans x oc)

chpt. 1 the lab

Hey this is my first fanfic so please don't hate, you can make this a sans x reader if you want but the love story probably wont kick in until chpt four which will be coming up soon. there may be some spelling and grammar errors but whatever I am just speed typing a story I alredy started writing so yeah but if there are any suggestions for future chapters I will gladly take them into consideration, and just so you know the beginning of this story isn't going to be what the whole story is like, this is just here to show how they met and provide a little backstory, so anyway enjoy and like I said plz don't hate

it was cold and dark. A small light in the center of the true lab flickered on and off, revealing stained hospital beds, decaying plants, and an assortment of machines. Doctor Wing-Ding Gaster, the royal scientist of the underground, had just finished his greatest creation: two living skeletons. he gave them codes to identify them by: 5AN5 and 9A94. He had placed the both of them in a small cell with nothing but a "bed", which was simply a sheet placed atop a large price of metal jutting out from one of the walls, held up by chains. As time went on, the skeletons knowledge grew significantly, to the point where they could communicate through spoken words. Over time the skeletons grew closer and closer, soon becoming inseparable. One day, gaster had begun a new experiment with 5AN5, injecting extra magic into his system, however by doing so he was lowering his health dramatically until he was left with only 1HP.  Gaster had carved his initials into their ulnas, and despite their cries he continued with no sign of remorse.

As 5AN5 and 9A94 rested in their cell crying themselves to sleep, they heard shrieks and cries in the distance. they sprinted to the edge of their cell to see what was making the shrill sounds but all they could see was the morphing shadow of a creature and flashing lights. suddenly all the commotion stopped and the lab became quiet as the every aura had once again settled in the silence. 5AN5 and 9A94 feared that Gaster had done something of unspeakable horror.

The next day Gaster let the skeletons roam the lab so they could become familiar with their surroundings. While exploring 5AN5 discovered a cell with a soft blue light illuminating from the center. He stepped toward the cell and saw a small girl sobbing hugging her knees in the center. Her soft flame giving off a sad, yet comforting warmth. Once she caught sight of the skeleton her flame turned black and she scrambled to find a hiding spot, but all she could find was an old blanket . trying to hide under the blanket she screamed

"what are you going to do to me now?! I can take it!"
her voice grew louder with every word, echoing back and fourth off the walls. Her voice was hoarse, and cracking. The girl appeared to be ten years old and completely exhausted.

As 5AN5 stepped closer to the cell the girl backed away and her flame grew stronger and bolder. 5AN5 got a glimpse of her face: it was scarred and bruised and fear written. she appeared to be human but her jagged teeth and black flame, which appeared to change color with emotion, said otherwise. He slowly stepped forwards as the girl flinched at his actions, tears threatened to fall once more.

"what are you?" 5AN5 mumbled. the girls flame grew small and faint, her teeth dulled a little, and her face expressed a confused look. She put herself into a very defensive position, not letting her guard down.

"what?!" she exclaimed, her voice trembling. Sans had jumped at her loud tone.

"what kind of creature are you?" 5AN5 said this time louder. the girl looked at him confused, then tears started to form in her eyes. She started shaking and sans could see her trembling figure.

"I-I used to be human, but now.... I have no idea." she started to bury her face into her knees. her flame became stronger but this time it was a soft sad blue. she started to cry a little but then resumed hostility as her flame turned black and red as she backed away. Her teeth had sharpened and she grew dark red claws. The soft puffs of air leaving her mouth made her look almost dragon-like, resembling smoke. She had full stood up, her stature was tall and intimidating.