1 - 20 of 8,376 Works in Sans (Undertale)/Reader
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All you wanted was some ramen after a long night of catching up on your school work. Imagine your surprise when a colorful skeleton falls through your ceiling with nowhere else to go.
Feeling compelled to help the poor monster, you allow him sanctuary within your cozy little apartment while he figures out a way home.
You never would have imagined how that decision would change your life forever.
For better...
... and for worse.
(Or, Ink crashes through you ceiling and makes your life a living hell.)
(Updates at least once a month!)
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You're a Stud, Babe! - Halloween Special by KittyCatPaw11 for PumpkinPancakes
Fandoms: Undertale (Video Game)
31 Oct 2025
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This is your first time Trick-or-Treating with Dust since establishing a relationship with him last year, but he's running like... an hour late. Bro?
- Language:
- English
- Words:
- 5,700
- Chapters:
- 1/1
- Hits:
- 0
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Here Comes the Bride by FandomWorld9728
Fandoms: Undertale (Video Game), Underfell - Fandom, Underswap - Fandom, Swapfell red - Fandom, Fellswap Gold - Fandom, Horrortale - Fandom, Underlust - Fandom
31 Oct 2025
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You were so excited to finally get married to your long time fiancé, only for him to leave you for another girl with nothing but a note. Lucky for you, your two best friends were there to help you through this rough patch of your life.
Series
- Part 12 of Undertales Across the Multiverse
- Part 8 of Papyrus/Reader Fics
- Part 8 of Sans/Reader Fics
- Part 1 of Here Comes the Bride
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In which your teacher decides to assign a social experiment project and lets you do whatever you want as long as you dontc harm anyone. You decide a Confession booth would be nice and see how many people and Monsters add confessions into the jar, whether they be sad, happy, crude, or awkward, you would happily accept them all.
So, you happily set up the booth with a few sharpies, notecards, a jar, sign, camera, and the not, 'Leave a Confession. You came back after your class and low and behold your confession booth was a success.
What you couldn't expect was that later that night while reading and reviewing the footage of the day you would catch a specifical skeleton acquaintance leaving a confession that would whole heartedly screw your night up. And get his family involved because who doesn't like having a gaggle of skeletons breathing down their neck.
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You had been playing an immersive VR game: The World Of Aspenheim. However, after 10 years, the servers were about to close and to give your last farewells, you decided to stay online until the servers kicked you out. In the end, you fell asleep on the golden throne...
Only to wake up still logged into the game!? And why couldn't you log out!? And who was the one knocking on the door!?
"YOUR HIGHNESS? ARE YOU AWAKE?"
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You should’ve never agree to go cave exploring with your group of friends. Yet you did, and look at where you are now! Way underground, trapped in a place with hungry bloodthirsty monsters. Thankfully your three best friends have your back.
However, there’s not much they can do when you somehow catch the eye socket of two very dangerous and very deranged skeletons.
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lets make it quick
You're a mage, one of the 7 great mages. You and the 6 other mages helped your kind during the war, and you all won. You trapped the monster inside the mountain of E-bott. After the war, everything was perfect, peace everywhere, and the mages ruled the world. But something bad happened, and all of a sudden, you were the only one to survive; the other 6... they died, or at least 5 of them. One of them was never heard from again.Being immortal and being hated by your own kind, what a hellish life, isn't it?
Hiding away from society for decades, until finally, the time comes and you return to society to be a normal human being.
But you're not a normal human, so you need to change your appearance to look older and older over the years.
Then you fake your death
and change your appearance again to become yourself… then repeat.
You decide to open an orphanage to cure your loneliness, and it works! And then you start a business.
Over the years, you become one of the richest women in history.
Everything was perfect
and then fate seems to like you too much and starts saying, "Hey, let's break the barrier and give this mage some life!"good luck!
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They say life is full of surprises, but [Name] never expected to end up in an entirely different universe, one filled with monsters, souls, and magic. But this isn’t some happy fairytale; it’s reality. And reality bites.
Adapting to this strange new universe feels impossible, especially when the skeletal monsters causing you trouble also happen to be your roommates. And 'passive-aggressive' doesn’t even begin to cover it. Still, no matter how lost or out of place you feel, you refuse to let go of hope.
After all, if life can surprise you once... who’s to say it won’t surprise you again?
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So, I heard you like skeletons...
Reader insert prompt fills for @skeletonh0e's sans-centric Kinktober challenge on tumblr
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Sans and papyrus are missioned to go undercover, to try and get close to and figure out things about a spy called y/n l/n
They do an amazing job- Language:
- English
- Words:
- 594
- Chapters:
- 1/?
- Kudos:
- 7
- Hits:
- 39
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Monsters have come to the surface, and with that a lot of probelms have been caused, so maybe a marriage between two people from the two races might help?
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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~
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Here we are again! Another series of Undertale one-shots following the Fictober prompts and featuring the skeleton brothers as love interests to either my nameless or named girlies.
Just like the past two years, if you'd like any of these to be turned into fics, then please let me know in the comments! If enough people show they're interested, then it'll be added to my list of future fanfics! Five requests are what's needed for them to be added.
And if you choose to wait till the end of the month to read, that's okay! Requests can be made up until November 7th, when I post the list of the lucky winners!
Hope you all enjoy!
Series
- Part 3 of Fictober
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An ill-thought through party in the woods leads to you getting lost with a dead phone and no way to know where you're going. When all seems lost you stumble across a cabin hidden in the dark depths of the surrounding trees. In classic horror movie hero fashion you find yourself entering the creepy house to find more than you bargained for; including quite a few skeletons unearthed from the closet.
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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.” -
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It's been six months since monsters left Mt. Ebott. In that short amount of time they'd manage to blend into society as best they could, save for the heart of the city. Anti Monster gangs run those streets, scaring many of monsters away. These gangs forced monsters to stay on the outskirts of the city, close to the mountain. Then one day, the university that you work at dared to break social norms and hire a couple of monsters. Nothing could prepare you for what would happen next.
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The Chemistry of Love - Remastered! by MischievousManiac
Fandoms: Undertale (Video Game), Undertale
29 Oct 2025
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It’s been nearly six months since monsters broke the barrier and moved out from under the mountain and alongside humans. There was a lot of panic when they first surfaced. Suddenly, these beings of myth were no longer just myth: they were living, sentient beings that want to be given a chance to live and grow just like everyone else.
Maybe it was their calm demeanor that kept most humans from lashing out violently at them. Or maybe it was because they surfaced with a human child that wasn’t afraid of them. Either way, monsters slowly started working their way into the city. The neighborhoods and shops near Mt. Ebott were the first to accept monsters rather than turn them away.
Since you lived a little closer to the heart of the city, your life wasn’t altered all that much by their appearance. Every so often you would hear hushed whispers that some monsters tried coming further in only to be driven back by the Anti Monster gangs that started to plague the city, but you had never seen one. Certainly, never dreamed of working alongside one, only to fall in love with him, either. But fate is a mysterious thing.
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Etiquette of Possession by Pipsqueak (Skyhon)
Fandoms: Undertale (Video Game), Deltarune (Video Game)
29 Oct 2025
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You raise your eyebrows and gesture towards the back. “By all means. You’ve not introduced yourself to the others here… although I suppose that makes sense, given your mission.”
“i think that mission is a lost cause, to be honest. kris is sorta impossible to find a match for.”
“Well,” you say, “at least there’s wine, then.”
“exactly.”
There’s a pause in which you both lock eyes and blatantly stare at each other, but this time there is not a hint of hostility. It must last nearly a full minute. Somehow, this experience is not at all uncomfortable or weird. Paradoxically, the fact that it isn’t weird makes it weird.
“care to join me?” he finally asks.
And who are you to say no?
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Or: Sans is the Judge, and you... you are something else. Something that's been sleeping for hundreds of years, under the Deltarune Palace. Something he’s needed, and finally has.
Unfortunately, being possessed by a spirit of violent judgement kinda has its own quirks, and Sans is really fucking stubborn.
Fortunately, so are you.
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When life gives you a gun, you're gonna shoot. by Quinme
Fandoms: Undertale (Video Game)
29 Oct 2025
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One moment you were on the call with your friend, the next you are in a shady dark alley, pressed by... a crocodile with fedora?
Life is confusing, and you have no damn idea where you even are and what will come next.
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Undyne thought it would be fun to summon a demon, others didn't believe it would happen but agreed, and they end up summoning you