rorkitten

You have lived in the underground for 4 months now, and had befriended the most adorable cinnamon roll ever, Sans. However, you couldn't help but to gain feelings for his brother, Papyrus, even if Papyrus pretty much hated you. Could you change his mind? Get him to fall in love with you? There was only one way to find out.Reader's gender is not specified!Also Papyrus doesn't smoke in this story, sorry if you wanted that!Credit to Dizplicity for the artwork! Please check them out, they're amazing!http://dizplicity.deviantart.com/…

Author-Dayo

this is a love story between swap sans and the reader, the reader falls runs threw MT.Ebott trying to escape her twisted guardians when she is shot into a massive hole. Lost and hurt in an unknown place she is saved by a kind man who takes her in and treats her like family.Obtaining powers and learning about herself in the underground she uses them for good and helps get everyone out.Determined to help the people she Loves and holding onto her Hope she fights to survive and free everyone.this is my 1st Undertale fanfic and I wanted to start with underswap~ (if I get some things mixed up I'm sorry)…

CupofMochii

*Picture credited to rightful owner* One shots include fluff, and maybe lemons*Requests are Open*…

CuteLittleItalian6

What happens when a shortcut goes wrong and Frisk ends up in another universe? Will she be safe and more importantly will she get back home? Read and find out!(This story is based off a RP me and my friend Icey did together on Shamchat so I had to transfer it from script form to lit, I hope it isn't to terribly written.)…

Logians

It is about underswap characters…

Kim__chan

Error Sans in Underswap comic. "The comic doesn't belong to me"…

SansyReditXP

Hello People! This is my first Fanfiction and PleaseDo not Judge me :> be good alright?"All of your Save Files Have been Wrecked,now you start to aNew world.. Will you Continue to go back? Or Stay the one youLove?The Art Was by Me :>The character doesn't belong to me The original character belong to 'TobyFox…

Madison-hedgefox

This story will not have any sexual content..but then again i have yet to actually make a story containing sexual content as in a lemon or just plain out sexual/dirty moments in any of my stories but maybe i will in the future. C; this is my first Underswap Sans x Reader story but i'm putting a lot of work into for you guys so hopefully you will enjoy it. And i'm thinking about making a Error Sans x reader one along with an Underfell or maybe Aftertale Sans x Reader one if you guys want~ ;)…

GastonEatsEggsALot

Ullo everyone. So I decided to make a lemon (<- I hate that term so much) between US!Sans (or as everyone calls him Blueberry for some reason) and the reader becuase everyone is fucking obsessed with him when it comes to Underswap.…

AndieTheLynx

This story is about the adventures of Underswap! Sans, having a story telling you from Underswap! Sans's perspective of life.P.S: Underswap! Was made by Popcorn Pr1nceP.S.S: Toby Fox is the creator of UNDERTALE. The original game.…

Glitch_girl17

The title says it all. Sorry this is my first book so it's probably a piece of crap.Will contain mature content. Such as, swearing, abuse, general violence.…

BloodGumm

Blueberry - Sans of Underswap. But is he so different from Undertale Sans? Find out as we view Blueberry Sans' life in the Underground. I don't know what rating is used for mention of violence, but it's there. (Cover picture by NeykStar on DeviantArt) (Undertale owned by Toby Fox)P.S. - This is only my version/what I think of Underswap and any other AUs that might be mentioned. I don't own any AUs, Underswap, or any pictures, only my writing. I will do my best to credit all owners. Thank you!…

JasKJackson

You're trying to convince Underswap! Sans to be your friend, so you do the most reasonable thing you can think of. What might that be? Flirting, of course! But when he takes it a bit too seriously, you wonder what you've gotten yourself into... Cover: Look up Underswap Sans on Google, go onto images, and click on the first picture. It's on pinterest too if you can be bothered to find it.…

KarmaAkabane425

What if someone became papyrus from underswap? What if they gave their brother more freedom? What if they were the one that error kidnapped instead of sans? (Things will be different including personalities because I never seem to get them completely ALSO the AGES will be DIFFERENT I'm having papyrus as the younger brother idc is sans is the younger brother or not, I'm having papyrus as the younger brother so no complaintsAnd it's a different multiverse maybe everything will probably be different idk yetAlso give me ideas if you want me to update this story faster.…

CloverStream

**OLD WRITING WARNING** You fell down a few weeks ago...Asgore is about to fight you.Your about to die.You call for help...Did somebody come?*I only drew the cover I don't own the characters or other art*…

TheGrinningKitten

(I DO NOT WRITE ABOUT UNDERTALE ANYMORE SO PLEASE DON'T REQUEST ON MY CHAPTERS) (AND FOR THE LOVE OF GOD STOP COMMENTING ABOUT MY GRAMMAR, I AM SWEDISH AND I HAD A HARD TIME LEARNING THE ENGLISH GRAMMAR. I'M MUCH BETTER AT ENGLISH NOW)This is my oneshots of UnderTale. It invloes AU'S to! Background picture by Casper-Cat on Tumblr, editing by me, and editing program is called covercreator.net. Mostly X reader…

_Daddy_Pina_Coladas_

Edit: I'm sorry but this book is discontinued. I lost interest in this book and I couldn't do anymore chapters. I'm sorry but I'll maybe put some chapters in at time to time.So yeah, I apologize for discontinuing this book.P.s the picture cover isn't mine and my username used to be TMNT_DonnieLover(so cringey >///>))Okay this is gonna be a different story from the other stories I read. So please.... Don't hate on me________Its about a girl named (Y/N) (L/N) who fell down Mt. EbottShe met monsters there and showed them love and mercy.She even started to have a crush on a lazy monster.Sans.She loved how he smiles. She loved how he kept saying his jokes to you.Most importantly, she loved how he asked her out.She obviously said yes and they were dating. They told everyone the news.Undyne, Alphys, Papyrus, Gaster, and even Jerry! They were having fun until. The girl started to glitch. She couldn't save and she couldn't stop the glitch. Wonder what she do next?Wonder what's gonna happen?What choice is the girl gonna make?Book was inspired by @Random_Fan_Girl1738, @SilentObserverWrites & @pocokitty…

ghost_keef

Sans' life always seemed dull until a human (you) come into the Underground, and Sans is determined to make you his.…

Wolfie674

.....help me…

sabermoonlight1616

The Multiverse is vast, expanding continuously as more alternate dimensions are being created. Each world possesses it's own unique laws, stories and inhabitants.This world in particular, based on the well known Underswap Canon Universe, happens to revolve around three important questions.What if the first six humans who fell after Frisk never left the Ruins? What if the world is slowly succumbing to the corruption caused by the RESETs?And. . .What if Sans' cooking improved?A/N This is my own interpretation of Grouptale, in the Underswap Universe. Please read the Disclaimer and Warnings.…