Undertale AU X Reader Oneshots

Classic Sans x Reader Period Comfort

Requested by PotterTale

Y/N = Your name

L/N = Last name

E/C = Eye color

H/C = Hair Color

H/L = Hair length

F/C = Favorite color

F/F = Favorite Food

On the surface

You glared at the calendar as yet another sharp pain rippled through your stomach. You hiss in pain, curling into yourself even more then you already had been. You hadn't even left your bed since this morning; that is, after you showered of course. And of course it's just your luck that you were all out of pain killers, you could just ask Sans to pick some up for you, no. That would be way too weird! The two of you had only just started dating a few weeks ago. Nevermind that he was a skeleton on top of this, there's no way he'd understand what this curse was.

Nuzzling further into your fluffy blankets, you groan in annoyance upon hearing a knock on your front door. Assuming it was Sans, and not wanting or having the energy to get your ass out of your blankets, or bed. You raise your voice and call out; "The door's unlocked!" realizing all too late how aggrieved your voice sounded. Rather than hearing the front door open, Sans's voice was suddenly mere feet away from you. "Are you okay Y/N!?"

Needless to say, the hoodie wearing skeleton was swiftly greeted with a pillow to the face; as you sat up in bed, startled. Sans blinked, he blinked again, clearly registering that he had indeed just been slapped with a pillow. He was wearing his usual getup, cornflower blue hoodie, white-striped black basketball shorts, alabaster white under shirt, and- wait a minute. HE WAS WEARING ACTUAL SHOES!? Shocked was an understatement of how you were feeling at the sight before you. He was wearing... shoes. Not slippers, but actual, blue tennis shoes. The color matched his hoodie, you would have pondered over this longer, if it weren't for yet another sharp pain that shot through you.

You sucked in a sharp breath, clutching your stomach, Sans snapped to attention upon seeing this. Taking careful steps towards you as to not spook you yet again. "H-Hey, what's going on? Are you okay?" He stuttered, his snowy eyelights scanning over your movements, studying your body and mannerisms in an attempt to figure out what was going on with you. Upon small whimpers being his only answer, Sans placed his hands on your shoulders, moving his right one to your chin. Holding your head up with his thumb and index phalanges so you were looking directly at him.

"Y/N, if you don't tell me what's going on, I'm taking you to the hospital."

"N-No! I don't, it's just- uh-uhm..." You trail off, unsure of how exactly to explain this to him.

"Then what's going on? What the hell could have you in this much pain?" He asked, worry evident in his eye sockets. Your mind kept drawing blanks in your desperate attempts to explain to your boyfriend exactly what this was. His left hand trailed down to the rim of your shirt, pulling it up slightly to examine your stomach; yet another pillow was thrown at his skull. Biffing him directly in the face, you smacked his hand away from your shirt and pulled the piece of fabric back down.

"Point taken. Humans are sensitive to that I guess..." He muttered the last bite mostly to himself, he picked the pillow up off the floor and tossed it next to you on the bed. He sighed, picking you up bridal style and making his way to your bedroom door. "Well, something's wrong with you, and you're not telling me. So we're going to the hospital." He mumbles, right hand reaching for the doorknob; when you suddenly blurt out: "Wait no! I don't need to go to the hospital this is a normal thing I get every month! And I'm just all out of pain killers sopleasejustputmebackdown!!" You shut your E/C eyes, mentally cursing yourself for the last-minute explanation.

When you finally opened a single eye to look at Sans, you immediately notice that his eye sockets are completely black. Great, I broke him. You think, wondering if you'd possibly yelled too loud. Sans blinked, and his eyelight's had returned, he still looked extremely concerned. "If you get this every month, then that's even more of a reason to go to the hospital!"

"No, a-all women get this, it-it's something we... uhm..."

After the explanation because I feel awkward actually breaking it down :)

"S... So you're saying this is completely normal? For all females??" Sans stuttered, the two of you were now sitting on the F/C couch in your living room, the explanation had uh, possibly traumatized the poor skeleton in front of you. You nodded, "Some get cramps worse than others though, I'm unfortunately one of them." You explain, still feeling awkward and ever so slightly guilty. Sans nodded his skull slowly, mulling over all the information you'd explained thus far; before standing off the couch, grabbing a nearby blanket and bundling you up inside it. You smiled at the gesture, laughing softly.

"Alright, uhm, you stay here, I'll be back soon." Sans hummed, placing a soft kiss on your head before walking into your kitchen. You heard the shuffling of pans and utensils, along with him rummaging through your cupboards for a while. Then the clicking sound of him turning your stove on. It was oddly quiet for fifteen minutes or so, before Sans came back into your view, holding your F/C mug, filled with hot chocolate, along with your F/F.

You're hardly able to suppress a gasp at the sight, feeling as giddy as a child on Christmas morning. Sans delicately places the containers on your coffee table, pulling it closer to the couch for ease of access. He then plops down next to you on the couch, you hug him, nuzzling your face into his warm chest. Sans chuckles, wrapping his arms around you and threading his phalanges through your H/L, H/C hair. "Thank you Sans!" You purr.

"Heh, no problem, Marshmallow." Sans chuckles.

~~~~~~~~~~~ 1,044 Words!

Alrighty! First chapter was uh, very fluffy, lol. Thank you to @PotterTale for requesting this. I had a lot of fun writing it! Also, Classic!Sans calling Y/N "Marshmallow" as her nickname-- Ah!! I loved it far too much.

Hope you enjoyed!

~ Crystal