The Skeleton's Grin (Sans x reader)

Blood and Gold

You didn't realize how drained you felt until you were sitting still in the car, on your way to Alphys and Sans lab at the University. You could already feel your head dropping in exhaustion, but when Undyne hits the brakes as she decides last second, not to run the red light, your head meets the back of her seat. Sans panics slighty, "undyne! be more careful!" She grunts in response and Sans takes your hands off your head and makes you face him, "I'm fine Sans, really." He searches your face before sighing and pinching your cheek, "why do humans have to be so fragile?" You squint at him, "You calling me weak dude? Because I dont appreciate that." He seems to take your fake offended act seriously, "o-oh, no! you're no-" "Sans oh my god, i was joking! You doofus!" You laugh and put your hand on his face, like straight in the center, and push his face back. Since you don't take it back quick enough, he decides it'd be funny to lick your hand. THAT makes you yank your hand back and a gasp escapes you. You look at your hand and there's a little bit of blue saliva on it. "Eeewwww! Saaaanss! Why must you be this way?!" All he does is wink. "WHAT DID MY BROTHER DO HUMAN?" You argue if you should share the fact a skeleton just licked you and decide you can, "He licked me Pap! Your brother's gross!" Undyne snorts, "Oh did he now~? Where?" You reach up and smack her shoulder which earns you another snort, "Don't make it weird Undyne." She snorts again, "How can I make it weirder than a skeleton licking a human?" You decide to get back at her by wiping Sans saliva on her shoulder, "Punk if you just did what I think you did.." "I totally didn't just wipe skeleton spit on you." She groans in disgust but continues driving anyway. "my spit isn't gross like a human's is. mine is magic." He waves his phalanges at you, which you smack down and then you pout towards the window. "aww, y/n. don't be that way. it was only a little bit of magic residue that came from my mouth." A finger pokes right on your spine, which makes you shiver. "oh, uh, sorry. that didn't hurt did it?" A chuckle escapes, dispite you still being a little grossed out over him licking you, "No it didn't hurt. Just felt weird cause you poked right on my spine." You look at him and he has a dusting of blue on his cheeks. "We're here nerds!"

Everyone gets out of her mustang and thankfully it's a Saturday, so there isn't as many students walking about as a regular weekday. Undyne already knows the way to the lab, so you all follow her. You stop in front of a familiar door then slams it open, "Hey Sweetie! Got some questions for ya!" A squeak sounds from behind a machine and then the clatter of tools falling. "U-Undyne! I th-thought I t-told you to st-stop scaring m-me! I'm very busy right now since Sans left in such a hur-" The scientist herself steps out into your guy's sight. She doesn't seem to be expecting all the other people here, cause she jumps and squeaks again, "O-Oh! There y-you are S-sans! W-why'd you l-leave so suddenly?" Sans shruggs his shoulders and leans against the wall. "Ok Alph! Y/n did magic shit, and we need answers!" Alphys looks at you with wide eyes, "M-M-Magic?! H-how? W-what k-kind did you do?" She scampers over to you, excitement in her eyes. "SHE DID A DEFENSIVE ATTACK SIMILAR TO MY BROTHER AND I'S." Confusion crosses over her face, "U-Um...C-can you e-elaborate on th-that?" Papyrus opens his jaw to speak but Undyne beats him to it, "So one of my spears got deflected weird and it was going straight towards y/n, I yelled her name and suddenly a wall of Bones covered her and blocked my spear! It was SICK!" Undyne looks ecstatic and she starts ranting about how she'll be your personal trainer to help you with magic.

"yeah, undyne, that ain't happenin." Everyone looks at Sans who has moved from leaning against the wall by the door, to standing straight with his arms crossed. "And who are you to say if it is or isn't?! Y/n has magic now! Someone has got to teach her how to use it!" Undyne crosses her own arms and squints her eyes at Sans. "she doesn't need to be in any more dangerous situations! everybody knows you can be..intense." Sans meets her glare and you see Papyrus shift a bit at the tense atmosphere. You feel it too, like a buzz of something powerful in the air. "I don't see you offering to do anything in this situation tough guy." Alphys is sweating nervously and staring at Sans, but seems to get an idea of some kind and walks slowly to the table behind her. "well, she has magic like mine and paps so maybe Papyrus would be a better choice don't ya th-OW!" Sans is cut off when Alphys Knicks his radius with a small knife. Everyone gasps in shock at Alphys actions, "Alph! What the hell?! I'm mad at him, but don't kill him!" That makes you confused, why would a little cut kill him? "ALPHYS, I MUST KNOW THE REASON WHY YOU WOULD BRING HARM TO MY BROTHER." The scientist brings the weapon up for everyone to view, "G-Guys. Look!" All of you take a step closer and inspect the knife. You're the first one to notice just what Alphys was actually showing you, "Wait..is..is that...blood?!"