AN: let's just get to the point, this story is smut and you can read the main character as (adult!) Frisk if you want / are not into the self insert game, but they have female parts because that's what I'm used to. Alright, that's it. Have fun, kids.

Was he really going to do this right now?

Trying to ignore the caress of magic against your breast, you stole a glance at Sans, who was pretending to be asleep in the chair across from you. It was movie night, all your friends were over, and your boyfriend was being a worse glutton for punishment than usual.

Biting your lip to keep from making noise as he continued to tease you, the feeling against your nipples feelings oh so like a kiss, you lay your head on the arm of the couch and pretended you were falling asleep as well, hoping that the darkened room would hide your facial expressions.

If Undyne and Alphys weren't cuddled up on the couch next to you, with Papyrus splayed out on the floor, you so would have jumped Sans by now. Even without being able to see his face you just knew the fucker was smirking.

You barely suppressed your gasp as his magic spread out to tease at both of your breasts, pressing your face into your arm, you promised yourself revenge. He was always a tease, but this was a new low for him. And, well, a new high for you.

You were soaking wet from the sensation and thinking of ways to drag Sans' sorry ass upstairs when you felt the tingle of magic near your clit. He traced the edges of your sensitivity, and you spent agonizing minutes wondering if he was actually going to touch you where you wanted, when suddenly, he stopped.

Oh, he better have not fallen asleep on you. He had no idea what was coming to him if he did.

You were about to let yourself sit back up, debating the merits of grabbing some ice from the freezer versus going all the way upstairs for the air horn (you weren't certain if you could resist the little vibrating toy that lived in the drawer with it if you did), when you felt a merciless touch of magic press right where you had wanted it.

Caught completely by surprise, a little gasp escaped your lips as you curled up tighter, trying desperately to keep your breathing steady. You drew blood to keep from calling out as he brought you closer and closer to orgasm-

You heard your name, and a hand press to your back. "Are you alright?"

Thankfully, Sans had quit teasing you as soon as you had gotten Alphys' attention.

You managed a mumble, your heart now pounding even harder in your chest over the fear of getting caught. You boyfriend was lucky he liked things rough because you might actually murder him later.

"Is the movie too scary?"

What were you watching again? Nothing too horrifying, not with Paps around – you managed a quiet "Nuh-uh."

"Bad dream?"

You responded with another, more affirmative sounding murmur. The pulsing in you groin was starting to drive you wild, and maybe if you pretended you were asleep they'd send you upstairs.

"Is Sans asleep, too? Wake him up, Paps, he knows how to handle this dweeb." Undyne instructed, and soon Papyrus was shaking Sans awake.

Not how you would have done it, but you liked his enthusiasm.

"WAKE UP LAZYBONES, YOUR GIRLFRIEND NEEDS YOU."

"'M Paps, I was having such a good dream." His feigned grogginess was weak and that damn smirk only made you burn hotter.

Papyrus picked him up and deposited him on the couch beside you, Undyne and Alphys deciding to inhabit the loveseat that Sans had vacated. "HERE YOU GO HUMAN, SANS IS PRETTY GOOD AT HELPING WITH NIGHTMARES."

"tell me allll about it, honey." He whispered in your ear as he lay down beside you.

You rolled over, pressing your hand against the bulge in his pants in response. "I was really scared." You pouted.

He pressed a kiss to your lips. "i'm here, don't worry." That was the problem.

You increased your grip, pressing your hips against his as you did. You weren't going to make it much longer at this rate and the movie wasn't even half over.

You decided to roll over and actually try to watch it, hoping it would help you cool off. Of course, grinding your ass against his cock wasn't helping matters, but it sure made you feel better - you had actually managed to pay attention to the movie for two whole minutes before he slid his hand down the back of your pants, his fingers reaching around to tease at your slick entrance.

Despite your better judgement, you moved to give him better access, closing your eyes and biting your lip as two hard fingers slid into you, a third quickly moving ever so slowly across your clit.

Despite your earlier promises of revenge, you knew you'd give him anything he wanted right then and there.

"i think it's time for sleepyhead here and i to hit the sack." He said, slowly sliding his fingers out of you before sitting up. He did love you. He really did.

"Are you two kidding me? It's not even ten!" Undyne replied incredulously.

You yawned as convincingly as you could, for being wide awake and frustrated.

"AT LEAST FINISH THE MOVIE WITH US?" Papyrus pleaded.

Sans looked down at you and smirked a little. "Oh, all right."

Scratch that. He loved making you suffer. "I don't know if I can stay up that long.."

He leaned back, his arms resting on the back of the couch. "I'm pretty sure you can."

Curse him.

You sit up on the opposite end of the couch from him, every nerve in your body begging and pleading you to jump on him, but you aren't about to give him the satisfaction. Instead you try to focus on the movie again.

It was some anime movie that Alphys had brought, cute in places but also - of course, nothing was stopping you from heading to bed and dealing with the problem yourself. Wouldn't that be the ultimate revenge, making him miss out on the ending of what he started? Of course, it wasn't as good as the real thing, but at this point you were more than willing to take the easy way.

You got off the couch and started heading towards the stairs.

"heading to bed already?"

"Mhm. I'm realllly tired."

"YOU DIDN'T GET OUT OF BED TILL NOON, HOW ARE YOU TIRED?"

You had your reasons.

"come cuddle with me and finish the movie. please?"

Cursing him and that cute smile of his, you curled back up with him on the couch, and to his credit, he waited a solid minute and and a half before his fingers started wandering, the front clasp on your bra mysteriously coming undone. If he hadn't been teasing you mercilessly you would have thanked him for the excuse to undo it, that bra was always too tight.

Only, now you would have killed for the extra barrier of fabric between you and the feather-light touch of your cruel boyfriend, which was not something you could say often. You bit your teeth deep into your lip as he started playing a little rougher, tasting blood again as he moved his hands away, resting his hand on your hip as he pretended to be interested in the movie.

You were starting to think some pretty naught things as he started to trace little circles on your hip with one finger. At this point even the slightest touch was more than enough to set you off, and if this movie didn't end soon you were going to do something drastic.

You tried to focus on anything but his hand grabbing your ass, and his warm breath on your neck. You noticed that Papyrus was snoring, and that Alphys looked like she wasn't paying attention to the movie - Sans's hand was slipping into the back of your pants again and his fingers were reaching for - Alphys teeth were digging into her lip, and it looked like Undyne was taking a leaf out of Sans' - you barely choked back a moan as his fingers slid into you again, pressing your hips back you forced his fingers in deeper - two or three this time, you couldn't tell because you just wanted more.

"getting sleepy?" He teased, sending tendrils of magic even deeper inside you than his fingers could reach.

You murmured something to the affirmative, not trusting yourself to actually speak.

"maybe we should head to bed soon?" He whispered breathily, stroking at a place deep inside you that made you realize exactly how amazing life really was and how you were going to fuck him senseless the moment you got him alone. If you made it the next few moments without dissolving into a screaming orgasm, that was - and you weren't exactly sure if you still had the control to hold it back, not with the way he was -

"We're probably going to head out once the movie is over." Alphys said with the fakest yawn you had ever seen. "Long day ahead of me tomorrow.."

You were certain that long day was going to start with an even longer night - not that you had any room to talk.

"i getcha, i should probably crash soon myself."

There would be no crashing with you around. Not until you had effectively made him beg for mercy. Or at least gave you what you wanted. At this point you weren't feeling picky.

After what seemed like an eternity, the movie was over, Papyrus was carried up to bed, and you were saying a very distracted goodbye to Alphys and Undyne. In fact, the moment they were out the door, you had Sans pressed up against it, your lips pressed to his neck and your hand wrapped around his pulsing blue cock - you weren't about to waste any time.

"Who in the hell do you think you are?" You murmur, scraping your teeth against the bones of his neck.

He let out a soft moan. "you know you enjoyed it."

"Mhm. And now it's my turn to return the favor."

Despite your overwhelming desire to drag him to the floor and ride him for all he was worth, you decided a little revenge was in order. Just a little.

Tugging down his shorts as you dropped to your knees, you nibbled and licked at his cock until his fingers were buried deep in your hair and he was breathing your name in soft little gasps. Of course, you weren't going to let the fun end there. Taking the length of him, you let your tongue do the work as your reached up to stroke his tail bone, until he was shaking at your touch and so very close.

You were just pulling away from your near puddle of a boyfriend as there was a knock at the door. Oh joy.

He looked like he might collapse as you gleefully opened the door.

"Sorry, forgot my purse." Alphys explained as you let her in. "You okay, Sans?"

He was leaning against the counter, feeling every moment of the torture he had put you through. You had pulled away at just the right moment, you were sure.

"He's alright. We were just having a little talk, weren't we honey?" Despite the pulsing need that tingled from your chest to your toes, payback was fun.

He gave you a look that made you equal parts scared and turned on. Make that mostly turned on, whatever he did to you was going to be short lived, the way you had him. "Mhm."

Alphys, of course, could probably tell what was going on, and wasted no time grabbing her forgotten item and leaving again. She was so considerate, unlike a certain boyfriend of yours.

The lock had barely been turned on the door following Alphys departure when you found yourself bent over the counter, pants around your ankles and the fingers of a very frustrated skeleton twisting at your nipples.

"i think it's my turn for payback." He murmured into your neck as his cock teases at your entrance.

"You know you just want to take me."

He shudders at your words. "mm.."

"Please baby? I want you so bad.."

You know you have the upper hand when you talk like that, and it's barely seconds later when he picks up your hips and thrusts into you, a moan escaping you lips as he finally gives you what you've been wanting for hours.

One hand pressed hard onto the counter, you slip your hand down to play with yourself as he pounds into your pussy - but he pulls your hand away to do the job himself, stroking and teasing like only he can. It's moments before you're close again when he touches you like that, but he stops as his own orgasm overtakes him, pressing into you harder and harder as he fills you up - you gasp and pant as you wait for him to give you your turn - you're so close now barely a touch will do it, but instead he pulls out of you, his fingers ever so close your sensitivity but not giving you what you want - and here you were willing to play fairly for once.

You're shaking and not above begging as he turns you around to kiss you slowly, smirking for all he's worth, despite the shake in his hips and the hitch in his breath.

"I'm not done with you." You threaten. And you're going to get what you want, too.

"sounds like a personal problem." He replies, pushing you onto the counter.

You grab him by his shirt and pull him closer to you, threatening him with a kiss that's more desperation than venom, his fingers finding your over-sensitive nipples again and you might actually contemplate murder if he doesn't - but his tongue is teasing at your neck on the way down and his fingers are slipping deeper inside you as his agile tongue teases your sensitivity and this time he doesn't seem like he's stopping. You feel your nerves coil inside you again and you're grabbing onto the edge of the counter and the back of his skull because he better not stop when he's got you going like this, and you're helpless butter in his hands as his tongue passes once more, twice, you're gone on the third into a scream and the coil of your nerves flying in every direction as you feel nothing but pure bliss.

You melt into his arms as he stands back up to kiss you, murmuring your exhaustion into his neck and you're sure he's smirking again but you don't care because you are nothing but contentment.

"bedtime?"

You want to keep going but you also just want to collapse - you don't have the chance to respond as he's carrying you up the stairs, a slight stutter in his gait as he feels his own exhaustion.

"I love you." You murmur as he curls into bed with you, your sleepy head resting on his chest.

"i love you, too." He replies with a grin that you can't help but adore, forgiving him for being such an awful tease as he holds you close and you both fall into a blissful sleep.

I hope you enjoyed, and if you need more Sans in your life, please be sure to check out my other undertale fic "Love and Magic" - otherwise, please be sure to review and tell me what you think!

Purrs,

TigerLily