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Undertale/Undertale Au's oneshots | by LittleMissCalamity
Fandoms: Undertale (Video Game)
21 Feb 2026
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I won't write for underage characters, or write incest. I can do characters x character, or character x reader. If you'd like me to write about a specific character in a specific way you can ask me in the comments. :)
Edit like 3 years or so later...hiiii!! this is gonna have angst cause I feel like it now...I'm older so hopefully my writing is better :p
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Borrowing Time from Tomorrow (Undertale Reverse Harem x Reader) by Anonymous
Fandoms: Undertale (Video Game), underswap, Underfell - Fandom, Swapfell - Fandom
20 Feb 2026
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Papyrus thinks he’s being kind. He thinks that by ending your brief, beautiful "situationship," he’s sparing you from the wreckage of his own guarded soul and the threat of Chara's power. He’s trying to prevent a loss that hasn't happened yet.
Now, with three other timelines crashing into theirs, the Underswap brothers are no longer the only ones in the house. As the air grows thick with magic and protective instincts, Papyrus realizes that "letting you go" was a lie he told himself to survive, but when he's ready to take you back it might just be too late. -
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Continuation of "Pretty Like A Car Crash"
Crumble must prove to the facility that she can handle whatever is thrown at her, except sometimes the problems come from the skeletons that are supposed to help her.
It's up to her to prove everyone wrong.
Series
- Part 2 of Crumble and her Crumbling Life
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Doomsday prep has always been necessary in my opinion. If not for your time, then for another's time. So I got married young, to a much older, much richer man, waited a few years for him to die (cancer, so sad), and collected that money like candy at a parade. Then I picked out a nice place for a bunker, and had that thing built in another few years. When Monsters busted out of the mountain nearby, turning some Humans into Monsters, I was only slightly surprised the government's decision was to fucking nuke them all. Now I'm closing the door, and I see people in the distance waving their arms, yelling. I should just close the door, I don't know them, but I don't think it's fair to leave them out to die.
Author's notes, kinda:
Gonna be just Horror, Fell, and Fell/Swap variants.
Characters like Sans, Toriel, Asgore, Frisk, and others are really only mentioned, except Horror Sans.
Papyrus variants are more like different people in this, than variants of the same person.
Also, I don't really like Swapfell Pap (Purple) so sorry, but he might only be there for drama, not for a relationship -
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There are a number of little ideas within my head—or strikes of inspiration from fellow Undertale creators—that I'd love to write about! But they need a home...
Welcome to Reader x Everyone in the Multiverse!
I don't have a schedule, but I try to post often! I hope you enjoy these stories :3c
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NSFW Epilogue of my main fic ''The Reluctant Crown''
It follows the plot after the main fic and then time skips a bit. Can be read by its own I suppose but I highly suggest reading the main fic first!
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- Part 2 of The Reluctant Chronicles
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Trying to survive in an economy where monsters have emerged years ago, it even made your survival harder. To make it worse, A sudden snowstorm is coming. you couldn't stay in dark alleyways anymore due to violent people and monsters mostly creeping there, the streets were dangerous as well, it's too self explanatory.
Having no choice, you decided to break into abandoned houses- or you assume so. You've been doing this for months now, and it has been the worst thing to do ever, but surviving and safety comes first. The owners would kick you out every time, but atleast one day of sleeping comfortably was worth the trouble.
What happens when a human breaks inside an empty lodge, not knowing some skeletons are arriving home to rest their bones?
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Meet Grace a young bar owner with secret she holds tight but what happens when she meets a certain skeleton monster with a big 'family' Will her secrets stay hidden or will the world know.
(I am bad at tagging sorry.)
All the aus here are undertale, underfell, underswap, Swapfell purple, Swapfell red, Fellswap gold, Mafiatale, Mafiafell, Mafiaswap, the gaster brothers, horrortale lusttale, and lustfell. -
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To think, it all started because you found a skeleton in the woods. Not the strangest thing you've found, but definitely one of the best.
Sans is just thankful that you were understanding of his situation when you offered him and his 'family' a place to stay.
Do dogs like bones? Of course they do! But you're about to find out just how much a wolf likes bones.
As of Feb 2026, Ch 1-3 have been updated/redone.
Series
- Part 1 of Wolfish Wonder
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You've been friends with the skeletons since they moved in a few months ago. You consider them all to be your friends, best friends even. You decided to invite your twin over to meet them after they moved in with you.
For some reason all the skeletons seem to have fallen for your twin and they ask you for advice. You're fine with it since your twin likes them too!
But then why does it hurt so much?
(rating has been bumped due to one of the jobs the reader has)
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Your vision is blurry.
Your body hurts.
You are bleeding.
You don’t remember much.
But you are alive.
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An Undertale AU that is a mix of Horrortale, Beasttale, and Underlust. Everyone is horny, and you are the first human to fall in years.The reader is described as chubby and AFAB, but anyone can read.
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You're an engineer who works for Ebott's best research facility in one of the labs; your lifelong dream after finding a journal on Mount Ebott when you were a kid. When you aren't in the lab being smart, you're gathering materials at the abandoned doll factory for the machine you're trying to build.
But one night, you meet a skeleton at the factory. Naturally, you lie about why you're there and say you're there to hunt ghosts. You befriend him and try to find a way to gather the materials while keeping up with that lie. But those lies catch up to you when you start to meet all the other skeletons.
Edit: As of Chapter 29, all chapters have been edited and fixed slightly!
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It’s fun being dead.
Or undead, rather, as your sister likes to correct you. Your dear sister is the kind of person who took her dark arts very seriously. Or, her necromancy, rather. You’ll be the first to admit, you don’t know a lot about her school of magic. She doesn’t know much about yours either, but it’s always enjoyable to discuss magical theory with her. She says it’s not her specialty, but she tends to under credit herself.
Or: A remixed spinoff story of this_is_my_alt's The Sacrificial Skeleton and the Labyrinth of the Gods <3
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A misunderstanding lands you in a meeting of monsters and fetishists. From the chaos you find yourself in the dynamic company of a kinky Mutt, gasterblaster! Sans, and a cat-ear wearing Axe.
Deals are made. Boundaries are broken. You become thoroughly entangled in this group of horny skeletons with very unhealthy coping mechanisms. Even with your PATIENCE, and the comfort of your cute rescue collie, there’s some skeletons that are better left in the closet… -
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You’re a 23 year old who’s been living in a mansion you inherited from your Grandmother for a couple of years now. Your days consist mostly of chain smoking, drinking, sleeping, and scrolling. The house is huge, dark, and lonely. One day, out of pure boredom (and NOT loneliness) you post an ad looking for roommates.
ROOMS AVAILABLE— BIG ASS MANSION (no creeps)
What could possibly go wrong?
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PANDEMONIUM by Hysterically_Gone
Fandoms: Undertale (Video Game), Deltarune (Video Game)
16 Feb 2026
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What causes an uproar in the crowds. 𝗥𝗲𝘁𝗮𝗹𝗶𝗮𝘁𝗶𝗼𝗻? The revenge of those who live in poverty? 𝗙𝗲𝗮𝗿?
𝗜𝘁'𝘀 𝗬𝗼𝘂, a princess. The only human princess in all the lands. The humans plead for forgiveness, begging the King and Queen to not take their only hope. Their saviour.
They obligated.
In return she is to be betrothed to one of the Skeleton lords.
* 𝗬𝗼𝘂 𝗳𝗲𝗲𝗹 𝗲𝘆𝗲𝘀 𝘀𝘁𝗮𝗿𝗶𝗻𝗴 𝗮𝘁 𝘆𝗼𝘂 𝗶𝗻 𝘆𝗼𝘂𝗿 𝘀𝗹𝗲𝗲𝗽
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I swear I tried to end it all. This world is far too harsh and after everything, I saw no point. Now these guys around me are saying they love me, but I don't know them. They are monsters as well, and I don't remember any monsters being here. So who are these guys? Where did they come from?
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As you walked you failed to hear the screams of terror of a bus going over 100 miles per hour and the sounds of it starting to bust down- it speeds near the sidewalk—the people in it shriek. Their blood curling screams didn’t occur to you, your headphone quality being way too good. Your shoulders relaxed as you stretched your limbs; very much unaware of the danger and pain that would very much make your life way more miserable. You should move out the way. But- likewise, you are unaware. Of death flickering and time excited to cut your strings.
The bus is almost out of energy- and has been stopped.
Or so people thought.
It began to tilt- right where you were very much slowly walking. Andddddddddd—
It didn’t crush you to death.
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N-N-N-NSFW HEADCANONS....ehehehehe by chargrmain_x
Fandoms: Homestuck, Undertale (Video Game), Deltarune (Video Game), ULTRAKILL (Video Game), Splatoon (Video Games), Portal (Valve Video Games)
15 Feb 2026
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the sex ensues: THE SERIES
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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..."