Undertale smut

The Darkness In Everyone (Sans x Reader)

You and sans were sitting on a couch in your newly bought apartment above ground. Ever since frisk broke the barrier, monsters have gotten along well with the humans and fit in to some extend in the human world.

"On news 11 today! We will have a dangerous level 3 tornado storming in! Make sure you have your supplies and be prepared!"

You sighed at the news reporter and grabbed the remote to change the channel to anything other than the news.

An hour or two have passed and the heavy raining could be heard from outside.

" I hope Papyrus is okay..He went to Mettatons right?" You asked sans, seeing it was just him and You in the apartment tonight.

" yeah but he would be okay. He's a grown skeleton..A-And he has Mettaton.." He said with a light nervous chuckle, rubbing the back of his bony neck. You nod and watched the tv shut off, including all the power in the house.

Only seconds after, a loud booming crackle of thunder and lightning streaked the sky, shining through the dark abyss. You felt your heart race as you had pulled the blanket on both, sans and yours lap, to your face.

Out of all existing things in the world, you hated thunder and lightning. No one was there really for you as a kid to tell you it was okay.

"Hey kiddo. Are you okay?" Asked sans as he looked over at you, obviously worried.

You slowly nod and felt your face heat up, feeling embarrassed." I-uh..yeah! T-totally!" You took your face out from the blanket and fixed your messy strands that fell from your messy bun." Just uh..scared me." You say with a nervous laugh, a tint of red staying on your cheeks.

Sans chuckled at you and wrapped his arm over your shoulder, pulling you closer to himself." It will be okay. I'll protect you.."

When those words left his mouth you felt calm and collected again, leaning your head against his, unreasonably comfy chest."t-thank you.." You mumble, your hand falling and placing it's self on his thigh. Sans then tensed up and squeezed your shoulder.

"S-sans?"

He turned to you, seeing you looking up at him." Oh! A-sorry!" He let go of your shoulder and blue speckles grew on his cheeks. A smirk grew on your face as you leaned up and kissed his cheek, seeing the light blue go to a dark blue within seconds.

"H-hey..kiddo..what was that for?" He asked while looking at you with wide white pupils. For a slight second you could of sworn you saw a flash of blue wiz through his left eye.

" oops sorry I missed." You say with a smirk, quickly placing your lips back against him but on his teeth. His hand that was around your shoulder was now around your waist. He pulled you onto his lap, face to face. You bite your lip as he leans in and drags his blue tongue from the bottom base of your neck to the start of her jaw.

"AhHh..Sa-sans.." You mumble, feeling yourself warm up below. His hands left your waist and traveled up under your shirt, touching your warm skin to get to your breasts. He followed your soft velvet bra to the back and unhooked it. He then quickly took your shirt off and bra and tossed it to the side.

" w-wow..your beautiful.." He said in a praising voice, his hands caressing your breasts. His thumb ran over your now erected nipples, sending small electric waves of pleasure though-out your body.

Small moans left your mouth as you start to run your hands down to the edge of his shirt. He gives you a smirk before removing his hands from your body to remove his shirt. His hands go back to caressing your breasts while your hands rub up and down his ribs, placing your fingers inside some of the spaces, earning low grunts from sans.

His glowing blue tongue slips from his mouth and starts to lick over your nipples, leaving a small glowing trail of saliva wherever his tongue touched. You shiver at the feeling and moved your hips against him, feeling a large bulge in his pants, seeing that his shorts were to thin to hide the glow from underneath.

You get yourself between his legs and start to pull down at his pants, soon watching his dick sprint from his shorts. You lick your lips lightly before gently taking his dick into your hands. You begin to slowly rub up and down his shaft, getting light moans from sans.

"Y-yeah..oh fuck..." He breathed out, his head leaning back against the couch. You open your mouth and place your tongue at the bottom of his shaft, licking all the way up to the tip. He shuttered and placed his hand on the back of your head, pushing you down into his dick." Uggh..damn.." He growled, watching you bob up and down on his dick." Y-yeah just like t-that! F-fuck..!"

You only suck on his dick for a little bit before abruptly pulling off, causing a painful lustful look on sans face. You bite your lip and climb onto his lap, positioning yourself over him. With little effort, you pushed his dick against your entrance and felt it slide all the way in." AhHhh!" You moan, hearing him grunt to the pleasure as well.

Within seconds you were grinding your hips against him, riding him. His hands were placed on your waist while your hands were on his shoulders, keeping yourself balanced. After a while of riding, sans lowly growls and stops you from your action, laying you down on the couch and climbing on top of you.

He was the dominate one and was not going to let you do all the work. He went at the paste you were going at before speeding up, causing more slurry moans to escape your mouth." A-ah f-fuck! S-sAnnNs..!" You moan loudly, clutching onto the couch pillow your head was resting on.

Sans gave you a lustful smirk and turns your body so your leg is over his shoulder. He grabs onto your thigh and continues, his tongue slipping out and slowly going up your thigh. You felt a wonderful feeling in the position it caused your words to waver." S-sAaAhHNs! R-righ..oh! Y-yes!" You moan, seeing how entertained he was.

" I-I'm going to c-cum!" You moan, feeling all the energy building up inside of you.

" w-wait..h-hold on I'm close.." He groaned, picking up speed, which seemed impossible.

"Sans I-I can't hold on an-anymore!" You groan, now feeling the pain of holding back for so long.

" o-okay cum.!" He said in a low husky tone. After a few more strokes, they both cummed at the same time. He painted heavily, placing your leg back down and leaning back against the couch. His tongue and dick disappeared, only leaving his seed inside of you.

You lay there panting, your body twitching slightly from the wonderful orgasm. He tosses the blanket you both were using over you and places his teeth against your forehead, kissing you a goodnight. With your eyes closed you passed out on the couch, knowing that sans was watching over you and was not going to leave your side through the storm that you have forgotten about long ago.