Undertale AUs
36 stories
Mel sans x Reader (POSSIBLE LEMON)(on Hiatus) by Catastrophic_Life
Catastrophic_Life
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this was asked for by a reader, may have some lemon being possible y/n, an ordinary human, walks around her town, monsters were free, which makes her wonder, will she finally find some on and not be stuck staying single. What she didnt know is that she is very special, not like the others. -w- blep
Nightmare sans x Female reader by Wolfie-nighter
Wolfie-nighter
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Y/n had a normal life before everything happened to her a good childhood until she turned 15 and then her mom and dad died coming home take a adventure as y/n survival of school bullies and work and a shadow creature wait WHAT find out more in Nightmare sans x reader but be careful they might become Yandere for you Please don't delete this book if you see a mistake please just translate it if there's no mistake please leave the book alone my first book might be Yandere nightmare book I don't know yet nightmare sans is Corporation in this book None of characters belong to me expect y/n
Yandere Au Sanses [Discontinued] by Nightime_Ash
Nightime_Ash
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I wanted to make a yandere book, so here it is!!! You can ask for oneshots, friendship oneshots, but there will be no bad words, no inappropriate stuff, and no gore. I'll make a different yandere book that does have gore, but not the other things. This book is for the Yandere Alphabet mainly.
nightmares daughter (dust X Reader)  by mel1cinna2sugar3
mel1cinna2sugar3
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You thought your dad was dead but he got reborn and now you can finally be with him again. But because he's a 'villain' you need to be careful, mostly it's him being careful about you. But what happens if you may fall in love? Also you got some sweet magic and your best friends. Who aren't protective at all (can you hear the sarcasm?...... So much fricking sarcasm)
Sunshine (Error!Sans x Reader) [COMPLETED] by the_pacifist
the_pacifist
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20 year old (Y/N) is no ordinary human. About five years ago she was taken from her universe by Ink, a Star Sans who creates and protects AUs. He claims that she's different from other humans, an immortal being with special abilities, but (Y/N) doesn't believe him. Despite her doubt in him, Ink treats (Y/N) like his younger sister and she loves him like the family she never had. They live in a house together in the Doodlesphere where Ink protects her with his life, determined to keep her safe. She is friends with just about everyone from all AUs and travels with Ink whenever he goes to one. There's only one place Ink doesn't take her. The anti-void. Why? She has no clue. Heya lovely reader!! I hope you enjoy this story, I'm SO hyped for it! Pronouns used in this story are she/her :) Disclaimer: None of the art belongs to me!
The Dreams of a Mistake (Error!Sans x Reader Fanfiction) COMPLETE by 2_Writes_1_Story
2_Writes_1_Story
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When Y/N was young, she always felt like she was a mistake. Her mom loves her, her aunts and uncles treat her like she's their own child, and her cousins treat her like a sister, but it's the other kids her age that make her feel otherwise. Because of her interest in monster kind, other children say she shouldn't be a human, but rather be a monster too. The only escape from the real world she could get is her dreams when she goes to bed. That is until she wanders accidentally into the world of a monster her age, who understands how it feels to be called a mistake.
One Choice (Nightmare!Sans x Reader x Dream!Sans) by TheLunarGem
TheLunarGem
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You are a normal everyday girl but one day going to visit his grave you get transported to a new world. What will this world hold? In this fanfic you get to chose what happens from time to time, who will you chose? Who will die? Will you give them one chance? Do I even need to say it? Probably no lemons just no. Cover art by https://goo.gl/images/8SRDvg
Yandere! Underswap Sans x Reader by Jade_The_Unnoticed
Jade_The_Unnoticed
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She closed her eyes as her life flashed before her eyes. "That smell..." She said as she cringed,lifting her head up. "Death..." She let a few tears escape her eyes. 'Why should he....do this?' She thought over and over again,looking at the chains that held her. "Help...." Is all she could say before she passed out. That girl is you
Human Nightmare X reader by WitheredFoxyGorl
WitheredFoxyGorl
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Yes I did have the first story but there were to many cliffhangers and other stuff so this time I will stay focused. So this time there will be no cliffhangers I'm positive about this. And second of all this time he's going to have POSSIBLY ONLY one form which is going to be human. THE PIC OF THE COVER IS NOT MINE.
Yandere Ink sans x reader 2 by _cloud_uwu
_cloud_uwu
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Hey hey! This is book two like I said. Yup welcome to this mess of a shitpost called fanfiction. (If your new here, check out the first book to be up to date!)