Undertale AU Sibling Oneshots

Underswap! Sans x Werewolf! Reader

(I have been bouncing around a lot, from playing my new games Cattails and Cozy Grove, from attempting to work on Chapter 1 of my MHA story, this, and my new AU. I want you to know that I'll be trying to work on my new AU a bit more! It's bits and pieces rn(which that is a pun, there's your hint to the AU name), but I hope y'all enjoy my concept. And yes. I will gladly do requests for it!)
(I will most likely make an info chapter for my AU and put it as the second chap in this book, that way newcomers will see my AU, and it can be easily found!)

(ALSO ALSO IMPORTANT!!! I go by She/He/They pronouns now!!!)

Requested by the lovely corvid, @Theultimatecookie1!~

Rumors spread quickly in the small town of Snowdin. People often said they got carried by the Snowdin winds, along with the flurries and chill of winter.
So when a rumor of a furred beast in the woods came to be, the townsfolk grew uneasy. They grew wary, going inside earlier in the evenings, avoiding the woods unless absolutely necessary. The royal guardsmen stationed in Snowdin did more on their patrols, checking for footprints or scent trails for a possible location on this strange beast.
No reports of attacks had happened, but the ghastly noises at night were enough to frighten others.
Sans had been searching for you, seeing as his night wasn't taken up by monthly training on account of Alphys being sick. It was almost curfew, and Papyrus was too much of a lazy bones to get up from his nap.
Sans would admit the rumors were scary, but he was a part of the royal guard! He could handle whatever was out there!
He followed your usual pathing whenever you took a stroll through the woods, finding your footprints sharply veering off to the right, deeper into the woods.
Had you been taken?! No, he noted, there was only your footprints, and it was clear you walked this way willingly.
Frowning, Sans marched on after you, unaware of the danger ahead. The snow was falling more, beginning to cover up the footprints that had changed slightly, your shoes forgotten in the snow.
Sans scooped them up, worry tugging at his bone brows as he glanced around, absentmindedly shaking the snow out of your shoes.
"(Y/n)?" He called, tucking your shoes in one arm as he followed the direction your faded footprints were going.
The wind blew harshly, enough for Sans to miss the sound of your approach. He regained his bearings, only to go wide eyed at the sight of you. You sat before him, a bit taller than you usually were, sporting wolf like ears and a tail, fur covering your feet and arms.
"(Y/n)...?"
You blinked, leaning forward to sniff at him. You eyelights weren't white anymore, instead a sharp shade of your magic color. Your eyes were piercing, yet soft as you gazed down at your youngest brother.
"So... you're the beast the townsfolk are whispering rumors about?"
You have a small nod, glancing down a bit glumly, a heavy sigh leaving you.
"You haven't hurt anyone, have you?"
You were quick to meet his gaze again, shaking your head vigorously. Sans blinked up at you, humming.
"So... you come out this far into the woods to wait out this... transformation?"
You nodded this time, ears flicking towards Sans as you sat on your haunches to be more to his eye level, the snow crunching under you.
Sans sighed quietly. "Well, as long as you aren't hurting anyone I don't see a problem with your transformation! How long does it last?"
You reached down, drawing a clock in the snow with an arrow winding all the way around.
"...All night?"
You nodded, a soft bark of affirmation leaving you. Sans frowned again, one hand resting on his hip.
"Well that simply won't do! I don't care if you've been doing it without trouble, I don't like the thought of my sibling being alone in the cold woods all night!"
You groaned at him a bit as he tugged on your coat, managing to tug you along back to Snowdin.
"Don't huff at me! We'll get everyone used to you so you won't have to come out here all alone!"