Undertale
20 stories
Ungrateful (Geno!Sans x Reader) by BubbleBerryUniverse
BubbleBerryUniverse
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account inactive. you can find me on @Mini_Crushies
Test subject by xbutterfly_walkerXx
xbutterfly_walkerXx
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Gaster the royal scientist dark reality, you've seen the boys. You THINK you know there backstory. It's time for a harsh truth about Sans and Papyrus you never thought you would hear This story is based around my friends theory that Sans and Papyrus in a sense where 'made' by Gaster.
Overgrowth (Unofficial) Part 2 (Undertale AU: Flowerfell) by QUEENDUBSTEP
QUEENDUBSTEP
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The second part of the fanfic of Flowerfell: Overgrowth. I did not make the first part, and the second part has as of now not been viewed by the creator of the AU of Undertale or by the writer of Overgrowth, part 1. This is an unofficial part 2, and I believe there is an official one. You can read the first part here, and I HIGHLY suggest you do, as you will not understand most of the story without it. Here is the link (Hope it works, Im not one to usually use Wattpad): http://archiveofourown.org/works/5734642 If it doesnt work, just copy and paste it into your URL Bar at the top left, and if even that dont work, search for 'Overgrowth Undertale fanfic Flowerfell AU' in Google and you will find it eventually. Overgrowth, part 1 has been written by SociopathicArchangel on Archive of our Own and he/she (sorry) has given me permission to write a second part. This Story contains similair content to Overgrowth, and thus it has some scenes of violence and is something your supposed to be sad about, but Im not sure that will work since this is my first ever close-to-finished story. Hope you enjoy, and have a nice day regardless! :D
Underfell MettaSans (One-Shot)  by Dwonderwriter0002
Dwonderwriter0002
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Sans has a big fight with his brother Papyrus. Like always, he runs off to clear his mind. Expect this time he runs into a robot, that may know how he feels. I do not own Underfell or the cover photo. Also to the artist of the cover photo, I can't seem to find you, if you see this please message me to take it down, or a good source I can credit you.
The Worst Possible Ending by wolfeatyou
wolfeatyou
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Chara has taken control of the coding, and is making Sans travel between them. All you really need to know. Warning??: this may have a little bit of gore. And can be depressing. I don't want anyone to kill me for not telling them this before hand This is a complete story.
Enchanted Bones by DarkFoxKirin
DarkFoxKirin
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You were frightened and fed up. These monsters kept on attacking you to try and kill you but you hadn't even done anything! Well, time to take matters into your own hands. Things escalate and get out of hand when you try to 'fight back'. What happens next changes your life forever.
AU HighSchool x Reader OneShots by Madison-hedgefox
Madison-hedgefox
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[Warning!] This Is a Book of AU characters x reader stories and may contain strong language in some of the stories along with sexual moments and perhaps Lemons! If you do not like any of the following listed do not read this! As for everyone else enjoy ya little sinners! xD and make sure to comment requests of an AU Character x reader oneshot that you wish to read~
Oh, Death (Flowerfell) by Paranormal_Puppet
Paranormal_Puppet
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Based on the Underfell fanfiction "Overgrowth." Please read it before you read this. All of the underground knows of the song. It's sung at funerals and as lullabies. It's a haunting melody that often rings throughout the minds of monsters. But even after they gain their freedom to live in the new world of hope, it's tune has never left Sans. In memory of my precious nephew and great uncle. Rest in peace.
Welcome to the Underground (Underfell AU) (DISCONTINUED) by krypticsil
krypticsil
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"Welcome to the underground." Sans said with a harsh smile. His gold tooth glinted like the sun, reflecting off his sweat, making it seem as if he was sweating gold. I felt Flowey's vines tighten. Sans chuckled. "You won't make it very far." Credit, of course, to Toby Fox and his colleagues. Underfell is not my original AU, credit to the creators.
Love Me Instead [Sans VS Gaster!Sans X Reader] (EDITING) by PineappleGalore001
PineappleGalore001
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When a mishap in a reset happens and a character from another version is transported into the current world and timeline, what happens? Gaster!Sans, bad-skele-boy from EchoTale is confused to see that he had landed in a different, yet familiar world: Undertale! Apparently, in meeting with his 'original' version, they seem to be OK with one-another, UNTIL... (Thank you, @yourebluenow for the cover!) Book 2 Is here! it has the same name and cover, but with 'Part 2' in the title! https://www.wattpad.com/story/70011017-love-me-instead-sans-vs-gaster-sans-x-reader-part