1 - 20 of 8,375 Works in Sans (Undertale)/Reader
Navigation
Listing Works
-
Skeletons, roommates, yea no by UnderTrash
Fandoms: Undertale, Underfell - Fandom, Swapfell - Fandom, underswap, female reader - Fandom, SAN’s x reader, Papyrus x reader - Fandom, bullying - Fandom, Mutt from swapfell, undertale x reader - Fandom, Grillby’s, reader getting bullied, (y/n) - Fandom, Selfharm - Fandom, cheating - Fandom, Mutt x reader - Fandom, Underfell sans Red, Red x reader - Fandom, G sans - Fandom, G pap - Fandom, Mafiatail bros, roommates - Fandom, Fanfic - Fandom, anxious reader - Fandom, Mafiafell bros - Fandom, reader as mantle breakdowns, Killer sans - Fandom, Killer sans is a asshole, Killer x reader - Fandom, mental illness - Fandom, Non-Consent - Fandom, sexual harassment - Fandom, Romance - Fandom, Poly relationship - Fandom, Mafiafell sans - Fandom, Mafiafell Papyrus - Fandom, AsylumTale sans - Fandom, Lusttale sans - Fandom, Lusttale papyrus - Fandom, lustfell sans - Fandom, Lustfell papyrus - Fandom, friends to lovers - Fandom, Y/n just going through trauma, Chubby reader insert - Fandom
27 Oct 2025
Tags
Summary
You’re a bit of a nervous wreck type of girl, chew on ice as you hide into your room. Though no one could blame you, after all you lived with asshole skeletons that makes it their goal to push you around and bully you.
Why you may ask?
ALL BECAUSE A BITCH NAME LILIAN!
——-
They all hate you but if they gave you a chance they might like you…
(Heavily been Edited PLEASE RE-READ ) nov/13/2023 - feb/12/2024
-
Tags
Summary
IT'S THAT TIME OF THE YEAR!
Kinktober time~!So yeh this is basically short drabbles of smut. Some will be longer, some will be shorter but I'm gonna try my best to make them juicy~
--------------------------------------------------------------------------------
-
Tags
Summary
Your day starts off bad, and somehow, food only makes it worse.
Luckily, your boys are there to help pull you out of your slump.
Series
- Part 2 of Falling Forward With You
- Language:
- English
- Words:
- 4,960
- Chapters:
- 1/1
- Kudos:
- 4
- Hits:
- 28
-
Tags
Summary
Months after being on the run, I was finally found and made to stay with a mage. Unfortunately for me, the mage I was stuck with was more evil witch than mage. Not only that, but he's caused the many skeletons that lived on his property to dislike me, too.
As grim as it was, I could manage. At least it was better than death.One month into my stay, however, something changed. Another skeleton appears, one much different than the pairs that the other ten came in. The mage demands that this skeleton be roomed with me in the attic. The attic where all the rest of the forgotten things go.
The rest of the skeletons argue and attempt to find compromise. During all of this, though, this new skeleton meets me.
And he refuses to leave me alone.- Language:
- English
- Words:
- 7,575
- Chapters:
- 1/?
- Kudos:
- 5
- Hits:
- 46
-
After the battle, you look at your hands... why did I became a skeleton? by Quinme
Fandoms: Undertale (Video Game)
27 Oct 2025
Tags
Summary
Your dear friend Reishu was in danger, she suddenly got attacked by a mysterious skeleton in a black and white, who carries a big blade on his back. In this fight you truly did your best to protect her, giving it all your efforts.
After a long battle, you lay on the ground, defeated and hurt, the only thing that's is on your mind is the fact that you managed to buy some time for your friend. That you did good.
The unknown skeleton lean closer to you, saying something, but you hear none of that, refusing to listen the words of the enemy. Despite it feeling like the end, you wish to do something before taking your last breath. You haven't used your magic for the past ten years because of how messed up it got after your father passed away, but now you do not care about messing up. With the last effort, you do your best in attempt to take this guy with you. Reaching for your soul, you use a spell to end this, to take rid of this intruder!
-
Tags
Summary
So, I heard you like skeletons...
Reader insert prompt fills for @skeletonh0e's sans-centric Kinktober challenge on tumblr
-
breaking the confines of platonic ideology by helio_heliohelio
Fandoms: Undertale (Video Game)
27 Oct 2025
Tags
Summary
With the ascension of monsters, there hasn't been a boring day since. Living in a town close to the mountain range had its perks, and things certainly changed when the neighbourhood I lived in starts getting new residents.
The only problem now is finding a better job.
Luckily, a skeleton appears and tells me about a restaurant I can work at. I accept.
And I soon run into a whole bunch of other skeletons that all seem to like me.
Romantically, and I'm afraid of what will happen. -
Tags
Summary
Finding yourself in a whole different multiverse wasn't exactly how you were planning your week to go, but knowing you, it was bound to happen at some point.
But hey! It's not all that bad.. well except for Dreamtale being in utter chaos, not having the squad with you, and being 'kidnapped' a couple times. But then again, this multiverse was already proving to be much better than your previous one. Or at least, there is more opportunities here. And come on, how could you miss the chance to see this many stars?!
Now you just needed to figure out how to get the squad here, hopefully without the stupid chicken.
Nightmare has a bad feeling, your Nightmare. You'll just have to make sure he doesn't go insane with worry.
-
Tags
Summary
He knew that you wanted him, and that your seemingly innocent teasing was an attempt to take charge, to take his control away from him.
His sharp gaze told you that he wasn't going to let that happen so easily.
// Kinktober 2025 – My take on the "sex toys / punishment" -prompt by skeletonh0e
-
Tags
Summary
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!
-
Tags
Summary
my life has always been haunted by misfortune. i thought that by moving more than 1,000 miles away from home, i might be relieved of my dark passenger.
but fate is quite the cruel mistress.
and falling into a pit of monsters?
well...
it's just my luck.
- Language:
- English
- Words:
- 6,219
- Chapters:
- 5/?
- Hits:
- 64
-
Tags
Summary
“YOU LOST IT?!”. Were the three words that echoed through the throne room, shaking the large ebony pillars that lined the walls. “WHAT DO YOU MEAN YOU LOST IT?!” “Well if Cross ha-”. “I don't care who’s fault it was, this was the easiest mission I have EVER tasked you three with!” A heavy grunt escapes Nightmare as he sinks into his seat. Pinching his nasal ridge. His tentacles dripped and swayed furiously. “Cross, seeing as you were the one leading this mission, do you care to explain what happened?”
Cross steps forward and bows down before the big throne. “Well, uhm, you see…”
-
Tags
Summary
Prompt hair pulling with mafia Red and fem reader, a bit of a continuation of the sex work prompt from day 12
Series
- Part 27 of Kinktober 2025
-
Tags
Summary
You'd never expected to be one of those people who bonded with a random stray, and if you did, you never expected it to turn out like this. The tiny... blob of an animal was cute, affectionate, and melted your heart before you'd even named him. Unfortunately, not everything is as it seems. You've met this lovely creature before, and he definitely remembers you...
-
Tags
Summary
You are suddenly pulled into a world where you’re no longer made of flesh and blood, but instead – magic. Confused as you may be, you’re determined to see through what this new universe has to offer you.
AKA you’re a teacher from Deltarune, and Papyrus accidentally pulls you into his AU.
(MONSTER!Reader) -
Tags
Summary
Being the cleric of an inter-dimentional war isn't that bad once you get used to it.
When a skeleton falls from a portal into your bedroom, rambling about things you'd always thought were fake, what would you do with everything he says? When he claims he needs to win a war against his very own brother, his bone and marrow, who are you to turn down his request to be his army's medic? When you realize you're falling ill, who are you to tell him something is wrong?
-
Tags
Summary
Falling into the Underground wasn’t on your to-do list. Falling for two skeletons definitely wasn’t either.
Blue is sunshine bottled in bone—sweet, loud, and determined to make you smile even if it kills him. Rus is quiet, steady, and the kind of person who remembers your favorite tea. Between the two of them, you’re constantly flustered, overfed, and very, very loved.
When both brothers realize they’ve fallen for you, chaos ensues—except it’s the polite, apologetic kind of chaos where no one wants to hurt anyone else. What starts as a tangle of awkward affection becomes something honest and warm: a relationship built on trust, laughter, and a whole lot of skeleton hugs.
“WE CAN SHARE THEM!” Blue insists, bright as ever.
Rus sighs. “That’s not how dating works, bro.” -
Tags
Summary
You are a shapeshifter with the rare ability to turn into an orange fox—a secret you’ve kept hidden, knowing humanity once hunted your kind. Living near Ebott, you slip into the night to run free, though the fear of discovery always lingers. Meanwhile, Sans and Papyrus have unknowingly welcomed a manipulative woman named Kora into their lives.
Behind her sweet facade, Kora is a gold digger using the brothers for wealth, status, and comfort, willing to lie, fake affection, or even blackmail them if needed.Eventually Kora stumbles across your apartments terrible condition, deciding to become “friends” with you and inviting you to stay in the mansion with her and her apparent mates. It started off fine, until she began to spread lies— rumors.. Even blaming you for mistakes, stealing. And god who knows what else.
Maybe you can help these skeletons see past whatever game she’s playing at? (Anti-Harem, That’ll switch into a actual harem..)
As well as machine chaos.
-
Tags
Summary
but blood is rare and sweet as cherry wine
(Michael is in over his head with his abusive girlfriend. Edge has decided this is the final straw.)
-
Tags
Summary
Magic and reality mix together. On one side, there were the most religious humans, those who repudiated the existence of magic itself.
On the other side, the Vikings, a brutal people, in search of ever more important conquests. They exploited every possible opportunity, to win.
And then there were the monsters. Strong enough to defeat any opponent... But with souls not strong enough to take control.
In all this, you are in the middle... What happens when a human with magical powers like you, ends up in the middle of a war, of which you did not want to be a part?
You wanted to stay away from all this... But a pack of very stubborn skeletons will drag you into something much bigger.