Sans X Frisk (V.Mild NSFW) Undertum thingy
A/N- After SIX rewrites I gave up.
Here it is and hope it’s not too bad. I think my problem was I’m not good at nsfw and smutty stuff even though I’m comfortable to write it. This contains some very mild, dry sexual acts. I just think going full out on sex on a full stomach wouldn’t be amazingly comfy lol. XD I just imagined the pain.
Requested by a very patient anon.
(Edit this later to make it look fancy.)
Summary: Sans and Frisk are prepped for a night alone together, but Papyrus unknowingly gets in the way and Sans blames himself. His sadness makes him binge eat which ends up in actually a rather enjoyable evening after all…
“Come on, dorkus! We gotta go!”
Undyne stood in the doorway of the skeleton household, tapping her foot. “You’re gonna miss the damn show!”
Papyrus looked back at Sans and Frisk standing together by the sofa and refused to move.
“B-BUT WHAT ABOUT FRISK? SURELY SHE SHALL BE BORED WITHOUT ME!”
Frisk giggled and played along. She stepped forward and helped the youngest brother put his coat on to hurry him up, for Undyne’s sake.
“Papy. I’ll be just fine with your brother. You go and have fun now, ok?”
Papyrus made a noise.
“FINE. BUT DON’T SAY I DIDN’T WARN YOU.”
“Sure won’t.” She said brightly.
Undyne quickly grabbed the tall monster’s arm and dragged him out the door. He yelled his goodbyes before the door shut.
Frisk was slightly stunned, but she was thankful for Undyne’s help.
The familiar sensation of hands on her shoulders made her shiver in delight.
“Hey, baby.” Sans purred into her ear. She turned and he let his hands fall to hold hers
“Hey.” The young woman smiled, blushing a bit.
“I’ve finally gotcha all to myself.” He said, leaning down closer to her face.
Frisk bit her lip, and as she closed her eyelids she felt his hot breath on her face.
Closer and closer they became, until their lips grazed-
“AND ONE MORE THING!”
The couple sprang apart, pretending to just have been talking.
“Yes…Papy?” Frisk felt her face turn beet red. That was embarrassing.
“CAN YOU ACCOMPANY ME TO THE THEATRE, MISS FRISK?”
Sans internally groaned, putting his hands in his jean pockets. She noticed this and tried to persuade Papyrus otherwise, but it didn’t work, and she reluctantly put on her coat to walk with him.
“I won’t be long.” Her face was apologetic as she glanced at Sans.
When she’d left, Sans sighed and clutched his forehead. He felt bad for Frisk, but he knew it couldn’t be possible to be together alone for an evening with a semi-secret relationship.
Annoyed at mostly himself, Sans ventured into the kitchen to eat whilst he waited. He was pretty hungry after skipping dinner, and it was getting late.
He reminded himself that he had been working hard to get into shape for Frisk these last few months, and he felt proud of his progress.
She’d often commented on how she liked the way his arms looked, and how he was taller than she was and so strong…
He huffed. Too bad he couldn’t spend any time with her like he wanted. He couldn’t blame Papyrus, but he blamed himself for not being brave enough to tell his brother in the first place.
He definately deserved comfort food tonight.
“Hmmm…what’ve we got here then?” He browsed the fridge.
“Pasta, pasta, pastaaaa…Ah! Bingo, baby you’ve got my number.” Sans chuckled to himself as he pulled out a pizza box from a couple days back and the ketchup he hadn’t started yet. Little did anyone know, but he still enjoyed the odd bottle now and again. It was better than alcohol at least.
“Better heat this up.” He chatted to himself mindlessly, still thinking about what a loser he was no matter how hard he tried to make himself stronger. Why couldn’t he just tell his brother he had a girlfriend?!
The pizza barely fit in the oven, but he made it fit by curling the edges a bit.
In the meantime, he scanned the room.
“I swear I had…” Sans tore open the cupboards and seized a purple paper bag hidden behind the cereal boxes. He opened it up and the smell alone was enough to make him start salivating.
“Oh god…I fuckin’ love donuts.” He pulled one out and stuck it between his teeth, groaning as the sweet buttery, sugary pastry squashed under his jaw and splurged it’s custardy contents into his mouth.
He crammed the rest of it in and checked on his main course before finding himself staring into the fridge again.
He’d almost forgotten about his feelings earlier: the disappointment over his own free will and independence. The thoughts felt like lead in his stomach, and he found that donut had really helped. It was kind of like filling up on nice soft fluff instead of heavy, unwanted burdens.
If he told his brother then Papyrus would think he didn’t care about him anymore, which wasn’t true at all. That, or maybe Papyrus would be heartbroken because of Frisk…Sans had a sneaking suspicion his brother also had an eye for the girl…
Oh lord, he was stuffing his face again. With a bottle of cola in one hand, and half a donut in the other, Sans sat on the floor next to the oven and watched his food like a predator would it’s prey.
He swallowed the rest of the donut, sucking sugar and jam off his phalanges.
Once the pizza was out, he took a moment to gaze upon it’s bubbling, gorgeously goopy being before making a start on devouring it.
Each mouthful was pure ecstasy, erasing his petty problems with every gulp. He leant against the work surfaces and rubbed his happy belly as he ate. He loved the rippling bubbles inside as they tickled him, and the soft, grateful moans as he slowly grew fuller and fuller.
The poor monster couldn’t control himself, and before he knew it, he had a whole twelve inch margarita stuffed inside his greedy little stomach.
The hot food not only tasted delicious, but it warmed his whole body through, radiating from his centre. Like this, he felt truly content.
“Mmm~ Eyes bigger than my stomach?” He patted the comfortable bulge under his shirt. “Not a chance, huh buddy?-GUURrhp! Heheheh…” He felt so disgusting, but at the same time he did feel good inside. Really good.
Sans munched his way through the other four donuts whilst sitting on the table. In between he polished off two more sodas quite easily.
Eventually, those thoughts that hurt him faded, but that didn’t stop him eating any more.
Already fairly overfull, Sans dug about in the fridge again to find a huge thick slice of brownie cake. He almost drooled and had to swallow his hungry saliva instead.
“Come to daddy…” He giggled to himself. He was being such a pig, but it was worth it.
Not bothering with cutlery, Sans gorged himself on the creamy chocolate dessert, moaning with pleasure. He made a lovely mess of himself and took care in slowly cleaning every bit of cake and frosting from his fingers and face with his swollen tongue. The appendage had become much bigger with his sudden take to binge eating.
He’d fattened up quite nicely by the end: full of dough and cream, chocolate dessert and the best pizza he’d ever had the pleasure of devouring…
He relaxed and exhaled slowly, watching his stuffed belly expand with glee.
“Look at this…” He gasped, a grin on his face as he played with his own chubbiness. “How big can you get, buddy?”
Sans’ stomach mewled in response in a kind of super-happy-but-really-full kind of a way.
“Just as I thought…” He looked around the room for inspiration. “I’m feeling…thirsty.” he smirked and found the two litre coke bottle kept for parties under the stairs.
He dropped like a dead weight into the couch and huffed as the air was knocked out of him. Being heavy was hard!
Lifting the bottle to his lips, Sans made a bet to himself that he could finish the whole thing before Frisk got back. He’d just have to pace himself…he could do this.
Chugging carbonated liquid on a full stomach was much harder than he’d imagined. The bubbles filled him up more than anything, and after a dozen gulps or so he had to pause to take a few breaths and release the pent up gas trapped inside of his insatiable gut.
“ghUUUURP! Oof..”
The bottle met his lips again and he held the growing curve of his middle as he drank and drank and drank.
“UUUUUUUUrp…ugh…” Sans was beginning to struggle. He’d never felt this full before; tummy all tight and round, peeking out from under his strained tee shirt.
Hesitant to continue, he lifted the bottle again. He was only half way through, but he’d made a bet. He was going to finish this bottle if it killed him!
Big mistake. This thing was huge! He begun to wonder if it was physically possible to fit all that liquid and bubbles inside of himself. Each time he swallowed, his belly would moan under the overstuffed pressure building up. He just felt so damn full he could barely move, and it seemed this drink would never end.
He winced, tummy tightening all of a sudden as though something inside him was expanding too. His tee shirt gave up and popped up to bunch below his chest, revealing a beautifully pure blue belly underneath. He was so full it’d started to glow with exhaustion.
“Mmmmmfff…” He groaned against the plastic and bravely took one huge last gulp. His lips finally met air.
He’d finished.
Several burps later, Sans had once and for all defeated the cola. Triumphant, he tossed the useless packaging away from him and collapsed back into the couch cushions. He groaned, massaging his plump, full stomach as best he could. He was so sensitive now without a shirt…
“Owwww…that was so stupid…ah…” He winced and opened one eye to look at the damage.
He cursed under his breath and tried not to think about what would happen in approximately five minutes time when Frisk came home. What would she think? What would she say?
He knew what Papyrus would think: ‘Greasy slob.’
“Uurghhhh…hic! Oh god, this hurts.”
“Sans?”
That sweet voice, and the loving way she said his name could only mean Frisk was home. “I managed to sneak away early.”
The girl came to sit next to him, still in the process of removing her coat. “Oh! Sweetheart…” Frisk’s eyes locked on the blue object spilling into her boyfriend’s lap.
Sans blushed blue and hid his face.
“I’m sorry, baby. I got all worked up and…”
Frisk silenced him by gently smoothing her warm hands over his belly. Her efforts comforted him a lot, and the angry gurgles coming from within settled for a moment.
He shuddered at the feeling, and covered her hands in his. Something about both of them having their hands on his stomach made him feel so happy. Frisk enjoyed it too, and her cheeks turned pink.
“You don’t have to explain yourself, Sans.” She said calmly. “You poor thing, being left alone like that. You just got a little carried away, didn’t you?”
She shuffled closer to him so that their thighs touched.
“Thank you.” Sans said softly, basking in their shared warmth.
“Shhh, sweetie. Look how lovely your tummy is… isn’t it delicious?” He let her hands free and she stroked the globe at his waist affectionately. “How does it feel in there? It’s awfully tight…”
Sans made a contented noise.
“It feels…all warm and heavy and…so, so full.”
Frisk adored the way he sounded so dreamy and blissful.
“You’re too cute, Sansy.” She praised, teasing his pseudo bellybutton. “You feel pretty hot. Is that belly of yours working too hard?”
His stomach replied for him, groaning loud and clear. Frisk giggled.
“I know a little thing that might help.”
The monster smirked.
“Yeah? What’s that?”
Frisk crushed her mouth against his and he almost choked. However, her lips were too sweet to resist and he kissed her back, wrapping his arms around her neck.
They pulled away, aroused by each other’s affections.
Frisk touched Sans’ cheek lovingly.
“Honey, I love you so much.” She smiled and he smiled back.
“Same ta you, babe.” He said calmly.
“Would you like me to help you out, sweetie…?” The young woman walked her fingers up Sans’ softly growling belly. “…Get your magic moving?”
Sans chuckled breathlessly under his weight. “That sounds like a cheesy work out tape, but why not?”
“Oh, I’ll give you a work out.” Frisk sat on her knees and helped him lie on his back facing her. They giggled and couldn’t help but blush as she climbed on top of him, thighs straddling the underside of his gut.
Sans reached up to clasp her face, pupils of light huge with desire.
“You look beautiful, baby.” He grinned, “What did I do to deserve you?”
“Shush, Sans. I’m rosy enough as it is!” She leant down to kiss him passionately on the lips, thus crushing her flatter stomach into his rounded one. The contrast was gorgeous, and Frisk bit back her moans of joy.
“Ya haven’t even started yet, babe.” Sans teased. She pouted and sat up to punish him with heaven approved belly rubs. His magic flesh was practically ectoplasmic; all soft and gooey. It was like massaging a huge blue jello ball.
“This thing is so cute. Never get thin.” She ordered, smiling broadly as her hands evoked a bubbling sound from his innards. Frisk subtly moved one hand between his legs to find the fabric of his jeans to be super tight both around his waist and his crotch area. She smirked, eyes following where her hand had gone.
“What are you doing…?” Sans felt unnerved by her expression.
Taken by surprise, his breath caught on a deep moan as the heat of her palm cupped the bulge between his legs. “Fffuck!” He couldn’t move at all, she was pinning his legs down. He could only a squirm like a fat little caterpillar.
“Mmm~ you like this?” Frisk thumbed his throbbing bulge a few times, and he wheezed.
“F-Frisk! Ah…mm!” No proper sentence spluttered from his lips that was successful, and he gave up, succumbing to her touches and heavily moaning throughout.
The woman took joy out of this. The way he was so helplessly full and pleasured really turned her on. She liked spoiling him like this much too much, and her panties began to get uncomfortably wet. She wriggled her hips, brushing his tummy with her midriff and her thighs squeezing his. He fit so snugly into those jeans he looked utterly delicious.
One hand toyed with his swelling heat, and the other his bloated stomach. The combination together proved orgasmic for poor Sans, and it didn’t take much more playing for him to feel that tightly wound coil of pleasure burst inside of him. He cried out, and she shut him up by kissing him again and again.
His breath was hot and his tongue eager as he kissed her back, holding her close to him by her shoulders.
“I love you.” He whined, “I love you so much.”
“Same ta you, babe.” She smirked, mimicking him and he found her impression quiet adorable, though she was nowhere near his pitch.
“Y-you did that without touching me directly…” He panted in awe. “How?!”
Frisk giggled and lay on top of him lazily, squashing him.
“You were so horny, Sans! It would have taken a miracle for that to not work.”
He blushed intensely and he kissed his cheek sweetly.
“I’m sleepy.” She said. “Can I use your lovely soft belly as a pillow tonight?”
Sans groaned but agreed. She adjusted herself to lie between his legs and rest her head on his distended middle. At first he was a little too full for either of them to be comfortable, but they whispered to each other for so long that he’d digested enough to be comfortable and tender by the time any of them wanted to sleep.
Frisk yawned, hot and fuzzy with happiness in her heart.
“Your tummy makes he weirdest sounds. They kinda make me wanna just…ugh they make me tired, Sansy. But I love spending time with you like this.”
“Just us…” He muttered. There was a pause while Frisk wriggled to settle down. “I’ll tell Papyrus tomorrow, when he comes back from Undyne’s.”
Frisk nodded and gave his stomach one last pat. It sloshed under her fingers and she smiled.
“Nunight, cutie.” She whispered.
Thanks for reading! Hope it was ok anon! And sorry it wasn’t quite what you wanted but I tried and waited too long. I’m still not taking requests but ideas are always welcome!
Luv ya Babs,
-Soi