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Undertale Smut Book

Summary:

where basically various AUs of Papyruses and Sanses fuck the Reader or get fucked by them. WARNING: NSFW

Notes:

Referred to as y/n in this one

Chapter 1: Underlust Sans x Reader

Chapter Text

My friends insisted I try out a monster stripper club since they came to the surface but I always refused, saying that it was vulgar but they disagreed. They had literally dragged me to their car and drove, trying to dodge punches to the face. "I DON'T. WANT. TO. GO!" I punch Darric in the face and he groans as Sydney holds me down. "Your going to get laid and what better way than a strip club? Now behave Y/N!" she said as she knocked me upside the head.

I rubbed the sore spot and glared. Ever since I told them I have never even went on a date before, they kept insisting repeatedly on doing so and when that didn't work, it went to getting laid in a human stripclub, which didn't happen. Now it was this?! Why do I even have friends anymore?! They were laughing at my expression as they stopped and got out, dragging me with, handcuffing me without me knowing. "WHAT THE HELL GUYS!" they laugh as they drag me inside, weird music playing that set the atmosphere. The place was glowing neon purple and pinks as monsters and humans looked at the monsters stripping and whooped at the dances. I cringed and glared at my so called friends with a growl.

"Aww come on y/n, I bet you'll have some fun here! Some of them are amazing in bed~ especially the fire man and skeleton!" Sydney replied and I gagged. How would that even work?! Wouldn't a skeleton be void of certain parts?! They dragged me along and I felt like I made the worst life choices ever in ever making friends with these guys. They dragged me to a certain pole that had a long lithe skeleton sliding on a pole and swinging around it with a seductive look. I cringed and looked down as my friends cheered, clearly not wanting to be here but I was handcuffed and surrounded. I wait for the torture to end, not even noticing a certain skeleton staring at me with what can only be described as a fascinated curiosity.

 

Sans' POV:

So many customers today and the most interesting to walk in was actually handcuffed. Her soul was delectably purple, the same color and brightness as his own. Unlike the other purples in the room, hers shone the same as his....which would mark her as his mate, only two souls can be alike after all~

She slumped in her chair, surrounded by a bunch of cheering men and women who paid attention to my brother Papyrus who was having a blast on the pole, dancing and stripping off it, sticking his tongue out lewdly. I chuckled until I noticed the girl was looking down as if the world was ending. I grinned deviously, perhaps I could help her have some fun~

I swayed over to the group and they whistled at Papyrus, not even noticing me sitting down on the young woman's lap and she looked up before sputtering incoherently and i chuckled and leaned down to her face with a seductive look "hello there little dove~" she suddenly blushed before shaking her head and glaring "Get. Off. Me. NOW!" she yelled out but the blush told me differently. I leaned onto her and leaned my head on her neck "how about I give you another skeleton inside you?~" I purred out in her ear and she looked around for an escape but there wasn't room to maneuver out as she blushed harder.

I had the sudden urge to make her feel good, even if she didn't know I was her mate and so I licked her neck and she shivered and gasped, looking at me, clearly shocked out of her mind. I burst out into laughter at this and the people surrounding us looked at us and grinned like they just saw the best thing ever. "Y/N FINALLY IS GETTING LAID!" one screamed and the others followed. I looked at them in surprise as the girl who I suspect is y/n was groaning in embarrassment as I sat on her lap. She glared at me and I grinned. "You all don't mind me taking this lovely little dove in the back, do ya?~" I gave them a wink and they hastily nodded, giving me room to move out with her in tow. The girl screamed profanities at them as I I dragged her by her handcuffs into a room, nodding to Lulu, our secondary bartender, who put up a sign saying 7 hours for 10 bucks each.

I nodded again with a chuckle as y/n tried to escape my hold but couldn't as I pulled her into the room and shut the door with a smirk, eyelights glowing purple and highlighting the dark room. "W-what are you go-going to do to m-me?" she asked in a frightened voice and my expression softened. I cupped her cheek lightly and she flinched, looking into my eyelights. My soul hammered in my ribcage at the curious look she gave me as she suddenly leaned into my touch. I smiled wide and kissed her softly.

Y/N's POV:

Why was I feeling so warm and loved by his expression? Something in me was feeling warm and loved and I didn't know what it was as I leaned into his hand. His expression softened and he smiled before kissing me and it seemed like fireworks exploded. The feeling on my lips was rather tingly and what I thought was straight out bones was actually malleable, able to move like lips. I squirmed a bit before I felt like melting into his touch and I kiss back hesitantly.

What was I doing? I just met this skeleton and now I'm feeling like he is someone special.....someone I can be sure to rely on.....but that can't be possible! I was trying to deny my heart with an actual mind but the mind was losing as he pulls me closer and pulls away from the kiss to run his purple tongue down my chin to my neck. I stifled a moan and he decided to nibble on my ear and I gasped. "If nothing is okay with you, the magic word is Purple...alright?" he told me with a soft tone and I could only nod as I felt heat pooling down below. With a snap of his bony fingers, I heard the handcuffs fall to the floor with a clank. I put my arms around his neck and he nibbled my neck with sharpened canines and I let loose a small moan. I felt him shiver and my body heats up even more. "My names Sans. I thought you would want to know" he said huskily as his hand goes to the hem to my shirt.

I didn't refuse nor say the magic word that, if in the right mind, should have been used. He took my shirt off me slowly as he took off his puffy jacket. There was a purple glow underneath his thin shirt that showed off his bones. I looked at it curiously and he chuckled "never seen a soul before dove?~" I shook my head no, unable to speak from awe. I thought souls were just spiritual mumbo jumbo, not physically real....his eyelights suddenly lit up brighter as he gave a lewd look "would you like to see yours?~"

I was curious but....my heart was telling me to trust him while my reasoning side was trying to scream at me to run. I decided to ignore my brain for once that stopped me from ever getting a boyfriend and nodded. He gazed at me with a genuine smile, full of love and I couldn't help but relax. "That's it, relax. It won't hurt one bit sweetheart" his hand went to the middle of my chest and I felt something pull against me. I looked up with a cautious look but he just smiles and it makes me shiver. I felt the warmth leave my chest and out came a glowing purple cartoon like heart that floated in place, bobbing up and down and pulsating.

Sans looks at it in awe as he cups it slowly, one hand still at my waist and I squirmed, blushing. The heart felt important and somehow seemed like it was everything I was and...perhaps it really was. He looked at me with a mischievous look and red flags of warning sounded in my brain. He licked my soul and I felt sensations crawling up my back like a tingly wave. I moaned and closed my eyes tightly, arching my back into him. He pulls out his own soul and has it hovers with my own before swirling around each other and I moaned, feeling pure pleasure run through my blood stream.

Sans was in no better shape as his eyelights became heart shaped and his tongue lolls out, breathing heavily and grinding against me. "That feels so good~" I moan louder and rub my legs together, reason lost to pleasure and lust. "S-Sanns~" I moan out and suck on his tongue as his breath hitches from the action before moaning breathily. He holds me closer and enters my mouth and pulls my pants down. I squirmed against him as his hands took off my panties. "You won't be needing these sweetheart~" he pulls away from the kiss and I gasp for air, cursing myself silently for not letting go of him sooner for air. He chuckles before bending down to my clit and sniffing it, causing me to squeak in embarrassment. "D-don't smell there! I-it gross down there!" he purrs and licks it, causing me to gasp and squirm. "Nothing about you is gross sweetheart, and I'll prove it~" he begins licking my clit and I moan out "SSsssaaannnnsss~" I grab onto his head and pant.

He hums and I bite my bottom lip hard and he pulled down his own shorts and a purple cock sprung free as he pulled his tongue away and positioned it at my entrance, rubbing it. I moaned and Lust's eyes shone brighter with a lewd look lighting up from the light in his eyes. "Want to feel good my little dove?~" he sucks on my neck and I melt, feeling so good that I can't even begin to describe it. The souls beside us are getting closer in their dance and it increases my arousal. "P-please~" I choke out, gripping his back. He purrs on my neck "your going to have to beg harder than that sweetheart~" again he rubs it against my entrance and I felt tears prick at the feeling of frustration.

"F-FUCK ME PLEASE S-SANS!" I scream and he rams straight into me, causing me to scream in pleasure and pain. He freezes as tears spring to my eyes from the pain "your a virgin...?" he sounds shocks and I can't speak from the pain as he lifted his head up to look at me in confusion. "H-How is this your first?!" he looks over my face as I cry. "I....no one's ever lo-loved me like that...." now I was feeling depressed and suddenly agree with my friends, that I should have just gotten laid....

Sans' POV:

H-Holy shit! I'm her first...but why is she crying? Why is her soul dimming slightly? I look at her and I noticed the signs I always wore back in the underground after a genocide run, depression. I could see my soul pulse, I was going to wipe that expression away, immediately! I grabbed her chin and lifted her face up before kissing her passionately and slowly going in and out of her, time to see how well I can do to make her scream my name.

She was a moaning mess as I laid her gently against the ground and continued, rubbing my phalanges along her side, wanting to feel every inch of her. I pulled away from the kiss and instantly licked her tears away as she gasped and moaned. "Your loved more then you know sweetheart. No human seems to realize this" I went faster and gave her a loving look, hoping to shut away that depression like I did with myself. I couldn't hold myself back any longer and pulled out before ramming it right back in, closing my eyesockets at the pleasure coursing through my bones as she screamed my name loudly. I continued pounding into her as she bit into my neck vertebrae to muffle her screams "HAaah~" I couldn't keep that sound out of me from the pain mixed with delight from the bite. I was getting so close and I could tell she was as well. "S-Sans! I-I'm close!" "I know sweetheart, cum for me~" our souls bumped into each other and that sent us both over the edge. She orgasmed, causing her walls to milk me as I cummed inside her, the high making me feel like I was on cloud 9. "F-Fuck so gooood~" I slumped against her as she panted silently.

I hugged her close as my magic disappeared and cum dribbled out of her. "Your loved by me" I told her as I nuzzled against her neck. She hugged back tiredly and I purred, loving the feeling of my mate's embrace. "Mine." I said and she giggled before falling asleep. I ran my phalanges through her hair as our souls returned, a purple string attached to them that disappeared as the souls went back inside. Mine. No one else's.