1 - 20 of 3,103 Works in Sans Ensemble (Undertale)
Navigation
Listing Works
-
Tags
Summary
Disclaimers:
Several details in this fic are heavily inspired by 'Blue joins the bad sanses' comic, so go check that out
Canon innacuracies: Passive and Corrupted Nightmare are the same person, Ink is the creator and not the protector, Ink, Error, Nightmare, and Dream, are all gods, Blue, Killer, Horror, and Dust's specific au timelines were all destroyed, and i took liberties with how the void works. Also, no Cross sans will be mentioned, i don't know enough about underverse, and there will be some OC non-sans God/entity/things later on. The fic will be split into parts, each lasting nine chapters.
Schedule: Once a week, on Saturday, Sunday, or Monday, and i will post art or a reference sheet with every chapter. Trigger warnings will be specified in chapter notes. I've never written for undertale before, so please let me know what you guys think :3With that said, the actual plot: After an injured Error crashes into Nightmare and Co's home, a close bond starts to form between the two gods, both forced villains. In light of Ink's attempt to kill Error, Dream finally starts to lose it, and Blue gets dragged along.
Average chapter length is 500-2000
Series
-
Slay (SAVE) the Princess by CrossoverAU
Fandoms: Undertale (Video Game), Slay the Princess (Visual Novel)
18 Oct 2025
Tags
Summary
You are in a basement in a cabin.
That cabin is in the woods.
In the woods, on his way, is a skeleton
He is coming to kill you.
Will you let him?
-
Tags
Summary
So, I heard you like skeletons...
Reader insert prompt fills for @skeletonh0e's sans-centric Kinktober challenge on tumblr
-
Random Ideas That I Don't See Enough In Fan Fics So I Decided To Try And Write(Eventually) by kofiitaut
Fandoms: Security Breach Shows - SunMoonShow (Web Series), Undertale (Video Game), UTMV
18 Oct 2025
Tags
Summary
Just some ideas I want to see in fan fiction more, might make a book of one shots for these ideas next.
If you wanna use an idea then let me know, and if I say you can, Please credit me.
Series
- Part 1 of Rando Ideas I Have
-
Tags
Summary
I'm gonna fill this with oneshot! or some scramble, or soon to be fanfic muah
Chapter: 1. Remembering you (ut sans/reader)
Chapter: 2. A meeting with you is sweet… more sweet than the dessert (swap sans/reader)
Chapter: 3. How far? Another universe, baby. (fell sans/reader)
Chapter: 4. The way to the hospital (HT sans/reader)
Chapter: 5. shit ghost?! Bitch! You’re a skeleton! (Dust/ (ghost) reader)
Chapter: 6.- -
Tags
Summary
We're back with another year of Inkwhumptobertale!
And this year, we have another twist: another list! That's right: every day, I'll be facing the challenge of eight different unrelated prompts, and I'll have to do my best to cram them all into the story, somehow. Admittedly, there is a low chance of me actually doing that, but I am obligated to use at least three prompts each day, and I'll add more if possible. I'd like to do at least one day fitting all eight prompts into the story at some point in the month, though. So..prepare for chaos!
These characters are not mine!
Series
- Part 4 of Writing Prompts
-
Tags
Summary
Kamari333's Kinktober shorts, following the prompts set along HERE.
Another year of Kamari333 doing their best to celebrate Kinkplay and the fun of erotica <3
Individual tags in the chapter summaries and notes.
Functional Table of Contents (with tags and warnings) included!
Series
- Part 9 of Kamari333 Kinktober Archive
-
Kidnapping the Boss and giving him the happy childhood that he deserves by catdemonakatsukigirl
Fandoms: Undertale (Video Game)
18 Oct 2025
Tags
Summary
When Killer decided to bring some unknown science experiment into the castle, the last thing they expected was time travel. But hey now they have the most adorable baby bones ever, their boss Nightmare who doesn't know who they are and oh yeah is also 5.
-
Tags
Summary
A sweet little series set in a world where monsters had been captured from the beginning instead of shoved underground.
Eventually, as the years and generations pass, both humans and monsters slowly forget the monsters were ever free.
We follow the story of an aging little zoo hoping to expand and take in a few monster pups. And the stories of several monsters who find themselves being transferred to the place.
-
Tags
Summary
You and your family are just enjoying a nice day at the park, when a life changing event happens that ruins everything.
You get taken away to a facility to be tested on...
Life doesn't feel as peaceful as it once did, you hated your new life.
"I wish I could just go into those story books I used to read..."
-
the big kinktober 2025 special by ohitsthatguy for YeeSans
Fandoms: Undertale (Video Game)
18 Oct 2025
Tags
Summary
so uh
i am writing and dedicating all these works to a very very special friend of mine, pookie when you read this, hi ily <3be aware i have no shame so a few of the chapters are on the really weird side of things, so please read over individual tags and warnings provided
happy gooning and spooky month for you all <3
-
Tags
Summary
You my dear reader are transported in your own au as sans then when you have just come into accepting life your comfort was washed away by one tiny mistake
You have transported to one of the fanfics or at least inspired by it you have read almost daily it was the typical ani harem fanfic were a human called Y/n is a very broke collage student
And then when they get an offer from their childhood friend to live with their numerous roommates that are more like actual boyfriends then roommates
the childhood friend will most likely spread rumors about Y/n which will cause the skeletons to dislike them then end up loving them in the end
But with you there things will change maybe help Y/n along the way or sabatoge her or maybe even matchmake her to another person!
Read and find out what happens to our dear reader
-
The Tales of Kháos: A Reapertale Re-Take by Palito266
Fandoms: Undertale (Video Game), UTMV
17 Oct 2025
Tags
Summary
A sequel to the previous three stories: "Tales of Infinity," "Tales of Pragmatism and Fabulism," and "Zero Tales."
Follow the gods: a brand new species that had been given consciousness by a mysterious form and a body as well. Explore how these deities accustom not only to their existence but also to the world around them that they must protect.Reapertale was created and is owned by Renrink. Inktale was created and is owned by Comyet. Dreamtale was created and is owned by Jokublogs. Errortale and Fresh Sans were created and are owned by Crayon Queen.
(English is not my main language, so there may be some grammar issues.)
Series
- Part 4 of Markings of the Cosmos
-
Tags
Summary
Killer had his babybones, Crescent, very recently. This seemed to have just amplified his own selves instincts up to 100.
But,when Dream eats a negative apple,band becomes shattered..
Nightmare had changed too..
Passive didn't remember him. Passive was never him.
He attempts to join shattered, to keep his child safe. But shattered didn't want to risk killer's life.
So he advised killer to leave this multiverse, and find a safer one. For his and his child's sake.
He travels and finds many, many multiverses that wouldn't take him..or his child.
But, when he accidentally falls into a portal, leading to a nightmare variants home...
Will he find himself a home there?
Or will he and his child have to keep looking?
Series
- Part 1 of Multiversal chaos:)
-
Tags
Summary
"Yeah? You want me to thank you?"
Between the exhaustion sat something unstable. Mania, sharp and wet in his tone.
"I want ya to think about what it’d be like if Killer or Dust were the ones taking care of you," Horror said, grin widening slow enough to show too many teeth. "They wouldn’t be half as gentle."
-
Tags
Summary
First kinktober ever, list isn't complete but trust it will be done by Halloween.
Dedicating this fic to my very very special friend of mine. Pookie, if you see this, ily <3
Uh yeah, hope y'all enjoy ^^
-
Tags
Summary
My first Kinktober attempts :)
Series
- Part 1 of Cactus’ Kinktober 2025
-
Tags
Summary
Ink insists on making everyone’s Halloween costumes this year.
It goes exactly as well as you’d expect.
The results are a masterpiece of chaos, but… maybe that’s exactly what makes it perfect.[Flufftober - Day 17: Making or Buying a Costume]
Series
- Part 58 of Undertale Fics
- Part 68 of One-Shots / Two-Shots
- Part 6 of Prompt Fics
-
Tags
Summary
A mix of fluff, angst, and crack! Universe and genre used will be in each chapter's author note, along with chapter specific warnings.
-
Tags
Summary
A little bit of one Ink's days, 300 years after Dream was lost.
- Language:
- English
- Words:
- 1,130
- Chapters:
- 1/1
- Kudos:
- 5
- Hits:
- 52