Undertale A.U
127 stories
Black Roses (Overprotective!Bad Guy Sans' x Child!Reader) by JulesRedenger
JulesRedenger
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Nightmare found a young child a long time ago. When they fell into a coma it sent him over the edge. several hundred years later the child wakes up in a castle of darkness, surrounded by people, er... skeletons, that they don't know. Now they are being raised by murderers, cannibals, and world destroyers. Oh yeah! And their Uncle is the god of Death. Fun. WARNING (but not really): This story has been known to give people heart attacks and possible death from wholesome cuteness. I am not responsible for said medical emergencies or deaths. Read at your own risk. ~~~~~~ || Few things. 1) The first couple of chapters are going to basically just be Nightmare, but it's for plot reasons. 2) Dream is definitely going to be a little ooc. Don't like it, don't read. This is just for fun. 3) Like I said, this is just for fun. So, updates are when I feel like it. 4) I'mma try to keep the pronouns for (Y/N) gender neutral, but I may just drop that at some point. Depends mostly on what you guys prefer. 5) any art or videos added are not my own unless explicitly stated. Cool? Great. Let's get started.
Bloody Desires; Horrortale!Sans X Reader by KingKaltac
KingKaltac
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It's been a few months since the last neutral run and things have taken turns for the worst. No one is happy, Everyone is starving. An you are the perfect prey, falling into the deadliest trap known to the underground. He knows something and your determined to find out. Will you loose your head?
Poems (Horrortale!Sans X Reader) by PsychoChevre
PsychoChevre
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She loved to sing and dance and rhyme. But her happiness was running out of time. She screamed and clawed to anyone at all, Because blood and skin couldn't break her fall. Tears and sobs and screams ran out, And still nobody heard her shout. Humans, monsters, but nobody came. And to everyone else they did the same. She was lucky he was being kind that day, So he didn't take her life today. Smiling and happy, her journey began, To free all monsters was her plan. She wasn't perfect, But it was worth it. She didn't want to be best. But despite everything, she never reset. (Horrortale!Sans X Reader)
Sans AU X Reader Lemon And Lime Stories by Anonymous_Sinner_TwT
Anonymous_Sinner_TwT
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🚫 REQUESTS PERMANENTLY CLOSED 🚫 Sans AU X Reader Lemon And Lime Stories Written By: Anonymous_Sinner_TwT Cover art and any other art in this book is not by me and all rights go to the original creators... Also it's exactly what it sounds like ( ͡° ͜ʖ ͡°). Enjoy a whole bunch o' Sans lemon fanfics ALL SINNERS WELCOME! When you are reading you may see this sign... ⚠️🍋 LEMON WARNING 🍋⚠️ No this doesn't mean "OwO Lemon tree" it means sin and if you no like sin then don't read... it's simple. Ok bye now go read because you wouldn't have looked at this book if you didn't want sin so...
Tangled (Error Sans x reader) {Completed} by HiiAlice
HiiAlice
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Undertale smut by Maddyybbyy
Maddyybbyy
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Full blown sins here guys! Mature content. If you click and read these stories you have did this on your own action not because of me. ***I DO NOT OWN UNDERTALE OR ANYTHING ABOUT IT!! ***
Undertale AU Sibling Scenarios by UndertaleKyannaKitty
UndertaleKyannaKitty
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This will be similar to Undertale AU Oneshots only: They're your siblings! Yep, cute, edgy, or anything else! Feel free to request!(Requests are closed at the moment) No lemons, cause I don't do dat crap.
Ungrateful (Geno!Sans x Reader) by BubbleBerryUniverse
BubbleBerryUniverse
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account inactive. you can find me on @Mini_Crushies
A glitch (error sans x reader) by oh_its_Alastor
oh_its_Alastor
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This is my first story about u and error sans it's ok if u don't like the story
Life in the Eyes of Death (Discontinued until further notice)  by CheeseCake2021
CheeseCake2021
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Reaper!Sans x Mortal!Female!Reader You are just a normal person. Nothing special. You breathe, you eat, you live and...one day, you'll die. Everyone will forget you and probably just walk over your grave-literally. But that never really bothers you. PS. This is my first story, so don't expect anything special, gonna make a cover for this later probably and lastly, I'm writing this to practice myself in finishing stories that I write and tell them to the world. Cuz that really sounds better than letting it collect dust in my head and just be forgotten.