Undertale AU Sibling Oneshots

Undertale! Sans x Reader

Me: *listening to the entirety of the Friday Night Funkin' soundtrack*

Requested by the lovely NingningPurple22!~

The dust coated the snow fields, the houses, the trees, and even floated through the air.
You had already lost Papyrus, down on your knees as you gingerly held his scarf in the snow. Sans had found you in tears, and you bawled into his shoulder.
"Where did the human go, (Y/n)?" He asked once you had calmed down some.
"Wa-Waterfall..." You whimpered, wiping the tears away with your sleeve. You grimaced at the feeling of dust on your sleeves, letting Sans take Papyrus' scarf.
He helped you to your feet, guiding you towards the dusty, water-filled caverns.
"Hopefully Undyne can stop them." Sans murmured, but there was a hint of tiredness in his voice, a hint of hopelessness.
You aren't sure why, but you feel like he's dealt with this before...
Waterfall showed no one but the dusty remains, and Hotlands wasn't much different.
You both made it to Judgement Hall, tears still tracking down your cheeks.
"They're not here?" You murmured, frowning at the empty hallway.
"We must've passed them." Sans hummed, "There's no dust in here."
You and Sans waited quietly, talking about what you had seen. You began sharing small memories, trying to lighten the mood in the world that was slowly growing dark and cold.
Then you both heard footsteps.
You both jumped to your feet, eyes locked on the entrance to Judgement Hall.
The human came into view, voice devoid of emotion. Before Sans could speak, they rushed forward, blade pointed right for him.
Gritting your teeth, you caught them by the soul and flung them back, right into the wall.
They got up and dodged the attacks you and Sans launched at them. Their blade missed their mark, and you growled when their red eyes locked onto you.
They didn't get very far when Sans' attack cut straight through their chest, blood splatting on the tile floor before they fizzled from existence, showing back up at the entrance of the hallway.
This process repeated several times, until finally the human didn't reappear.
They remained sprawled on the floor, beaten and battered beyond natural repair.
"Is it over?" You asked quietly.
Sans didn't answer, watching the human with an intense gaze for at least a minute. Only then did he allow himself to relax.
"I think so..." He murmured, taking your hand and guiding you back to Snowdin.

~~~

"(Y/N)!"
You snapped awake with a yelp, successfully smacking into the hardwood floor beside your bed.
Was that...?
"(Y/n)! Wake up, it's nearly past breakfast!"
You scramble into a sitting position, seeing Papyrus' scarf flutter out of the doorway behind him.
Your jaw drops and you jump to your feet, following Papyrus down the hall, still in your pajamas.
He acts like nothing is wrong as he sets to fixing you a plate, and your bewildered gaze falls to Sans, who, despite looking as bewildered as you, looks happy to have his brother back.