Undertail Stories

376 Stories

Lust's Little S!ut [FEMALE READER] by GalaxyTheFur
#2
Lust's Little S!ut [FEMALE READER]by Edgy_Bean
⚠️WARNING: THERE WILL BE CUSSING AND SEXUAL ACTIVITY⚠️
Sans in Heat X Reader  by Sinnnnnnnnnnnnn
#3
Sans in Heat X Reader by Sinnnnnnnnnnnnn
This is my first fanfic so don't judge too hard please... anyways, hope you like it you sinner ;) (18+!!!! Well, if you're younger I guess I can't judge you. I'm not...
Of a Better World by toast_and_bunz
#4
Of a Better Worldby toast_and_bunz
It's been a while since Horror's world could be considered even remotely kind. But a newcomer drops in, and reminds him that there's still sweetness to be found in life...
The Blue Hearted Hero (bnha x undertail fanfic) by crimson518
#6
The Blue Hearted Hero (bnha x unde...by Daniel Roberts
" why dont you just take a swan dive off a building and hope that in your next life you get a quirk " was the greatest advice given to the quirkless boy izuku...
A collection of bad fanfics by powermittens
#7
A collection of bad fanficsby End my suffering
A contest between friends I'm sorry you had to witness this horrible story.
Completed
Don't Reset by Gay4Pain
#9
Don't Resetby I'm okay.
Howdy, this is a flowey X reader thing, I'll try to post often.
ONLY ONE {Yandere!Sans x Reader} by DancingInThePetals
#10
ONLY ONE {Yandere!Sans x Reader}by *•Pastel•*
Hello! Here is a fanfic that I will write for you people who wanted this but couldn't find any.
"Not Quite Determined" Sans x Human/Monster Reader [COMPLETED] by FloweyTheGrouch
#11
"Not Quite Determined" Sans x Huma...by AsrielAs Flowey
You've lived your life without ever knowing your parents. Despite that you dream big because you don't have much; aiming to become a famous singer and prove anyone who h...
Completed
Nightmares Little Gang by Tired1PanPan
#12
Nightmares Little Gangby Pan
Nightmare, The King of Negativity, known for being cruel and torturing people. But oddly enough he feels lonely, I mean it must be hard when his only friend Error is alw...
I'm Pickin Up Good Vibratons~ (Undertale Sin One-Shot) by DoodleWritesAThing
#13
I'm Pickin Up Good Vibratons~ (Und...by DoodleWritesAThing
Just a drabble :P This story will include 18+ content, if you're comfortable reading that then move along, but if you are younger than thirteen and still have not had...
Classic x fell (lemon) by JackPutman
#14
Classic x fell (lemon)by JackPutman
Plz give me suggestions of what to do next and if I don't upload for a while it's because I have important things like school homework and I'm probably thinking about wh...
AU Sans X Reader one-shots by _PleaseDontGo_
#15
AU Sans X Reader one-shotsby _PleaseDontGo_
Want to be in a one-shot with the sans of your choice? Well you came to the right place!!! Just comment down below in one of the one-shots!!! Enjoy!!!!
omotale one-shots by WingedWhiteTIGER
#16
omotale one-shotsby Angel
this is full of omotale stories I write please excuse my Shity spelling and grammar this is NSFW I do take requests some fontcest
Flowey Reacts To The Undertale Community by Helluva-Weirdos
#18
Flowey Reacts To The Undertale Com...by Helluva-Weirdos
Yep, art not by me by the way, there will be inappropriate references in here
Ideas by danmoo768
#19
Ideasby Clarrissa King (Chara)
My story ideas feel free to use them just be sure to tell where you got the idea from
Soulbound: A Hero's Rebirth (MHA, Undertale, DxD crossover) by howlerwolf467
#20
Soulbound: A Hero's Rebirth (MHA...by Howler wolf
In a world where heroes rise and fall, two souls from vastly different universes find themselves entwined in a new life. Izuku Midoriya, the courageous young hero from U...