61 - 80 of 8,412 Works in Sans (Undertale)/Reader
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Why does he know so much about me?
Everywhere I turn, he's there
Anywhere I go, he's with me
I cant even think without him being in my thoughts
How does he know so much about me . . . .
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You're a hermit. Meaning you basically never leave your home unless necessary.
One day, you come home from your bi-weekly shopping trip, when your neighbour tells you some exciting, yet worrying news:
Monsters are real?
Certainly they wouldn't come near you.Eventually, you find therapy, meaning you have to leave your home more.
But it's much to the delight of a certain skeleton who's laid his eyes on YOU. -
An octopus is calling you “Moonbeam”, go figure. by Vin_cant_sea
Fandoms: Undertale (Video Game), Five Nights at Freddy's
10 Nov 2025
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Reader is a time-traveler, a universe-hopper, whatever you want to say. They often wake up with a need to explore consuming them, so they do what they do best, go off into random universes and multiverse, and well, fuck around. Problem is: now they’ve caught the eye of a certain God, who looks a bit too much like a slime covered octopus for you to take them seriously. Said octopus has decided that they’ll die before they let you out of sight and is now chasing you through the multiverse.
Basically: You’re a literal chaos incarnation, and you’ve caught Nightmare’s eye. We don’t know if he wants you dead, or if he just wants you—but you fucked around, and now you’ll probably find out.
Series
- Part 1 of Universe-hopping
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After playing undertale late at night and being sucked through your computer to that universe, you and your bone brigade have to figure out what it's like to live in a new world. And maybe try to get you home. If there's time.
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A collection of One shots featuring character I want to work with but don't necessarily want to write a whole story about, or just random ideas I wanted to write out.
I'll be adding more as I go.
Probably lots of fluff and good stuff. -
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All you had wanted to do was explore the empty Undergrounds a few months after monsters emerged. And where had that gotten you? Kidnapped and locked in some psycho skeleton's basement.
Luckily for you, you're "rescued" by other skeletons. Who all more or less look the same. Except you still can't go home, because you know about too much of something you're not suppose to know anything about.
So now you're stuck in the Undergrounds with a creepy murderous looking Axe, a perverted Red who can't keep his hands to himself, a loud and obnoxious brat named Blackberry, a dog like Pup that won't control his instincts, and a carefree Sans.
At least Blueberry is normal.... r-right?
Series
- Part 1 of Unpleasant SANSation
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Como hermana mayor te preocupas constantemente de Molly, tu hermana menor, asi que no dudas en aceptar ir a verla en su nueva cabaña en medio de la nada. Claro, no esperabas encontrarte una pequeña comunidad de esqueletos con ella.
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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.
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I'm Never Gonna Know You Now, But I'm Gonna Love You Anyhow by sweet_bellyache
Fandoms: Undertale (Video Game)
10 Nov 2025
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A decade ago, your quaint town fell prey to the greedy hands of violent gangsters, and life as you knew it went to shit. Your area became dangerous, depressing, terrifying, especially at night. All you have is the pizza place you inherited from your father. Your future seems bleak.
One fateful night, a monster walks into your establishment, not ten minutes before closing time. Something about that night… you wonder if holding onto a semblance of hope might be worth it this time.
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Side stories or one-shots depending.
Each chapter will be labeled appropriately.Series
- Part 2 of RuinFell
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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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Papyrus buys a game, but it's so weird...
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You’re not sure how you fell into the anti-void, but all you want to do is go home. Can you find it in a multiverse of infinite realities? Do you still belong there?
Maybe accepting help from this group of weird skeletons was a bad idea.
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When you were ten years old, your parents sent you to stay with a relative of yours from Ebott. Their villa was situated up on the mountainside, and you loved to explore the forestry. One day the ground gave out and you fell Underground, and faced terrors beyond your imagination. You were missing for weeks.
After you managed to miraculously return to the surface, your parents were relieved - but deeply troubled by your 'delusional ramblings'. They were convinced you were 'crazy', and feared how that would reflect on their reputation. Your doctors advised sending you to an in-patient psychiatric facility, which is where you spent the next few years in intensive therapy and counseling.
15 years later, you're a young adult with a somewhat manageable grip on life. You keep your head down, attend the social events that are expected of you, and try to be as unnoticeable as possible. Your parents arranged a suitor for you, and you're to be wed within the next year.
That is, until, those monsters your parents and doctors tried to convince you weren't real suddenly crawled out from the Underground. And they're a lot different from what you remember.
[[Underfell!verse.]]
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Three years into college and of course shit hit the fan. Thankfully for you, your good friends Sans and Papyrus are able to help you and offer you a room in their house when things go sideways for you. The catch? You get to meet all of their family and join in on the chaos that is the Serif family.
What could possibly go wrong?
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After endless resets and what feels like an eternity spent waiting, Sans no longer remembers how long he’s been alone or how many times he’s painted the Underground in dust.
The dust that never leaves his hands. The echoing voices that never stop.
When another human finally falls into the Underground, Sans expects the game to continue. But this one is different. Against his better judgment, he hesitates.
Mercy is a mistake he can’t afford.
Yet... -
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Peace has finally settled over the Underground, and New Snowdin celebrates its first festival of freedom. The air buzzes with laughter, lights, and the promise of new beginnings. At the heart of it all stands you — the host with a voice that lifts spirits and a smile that draws crowds together.
You turn every moment into joy, every word into music — and somewhere on the edge of the celebration, a quiet skeleton in a blue jacket watches with a grin that doesn’t quite hide his curiosity. Sans doesn’t dance, doesn’t perform, doesn’t chase the spotlight. But as your laughter drifts through the falling snow, even he feels the rhythm stir something in his bones.
Two opposites meet — the one who moves the crowd, and the one who never moves at all.
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You and Blue decided to have a little fun in the bedroom.
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Trapped on a savage island. Hunted by monsters made of magic and bone. Claimed by five who refuse to let her go.
﹏﹏﹏﹏﹏﹏𓊝﹏﹏﹏﹏﹏𓂁﹏﹏﹏
It started off as a fun day on the beach, until you ended up ship wrecked on an island in the middle of the ocean. But you are not alone, massive skeleton monsters seem to have taken a liking to you. they've taken too much of a liking to you, now you find yourself in the middle of a territorial war.
Series
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The world changed when the barrier broke. Monsters now walk the surface, and with them came an influx of new diseases that defy human biology and are barely understood. You, a brilliant young scientist, have been called upon to work with monsterkind to help treat these strange new conditions.
Unfortunately, your new supervisor just so happens to be a deeply cynical skeleton whose apathy clashes violently with your desperate need for productivity and some semblance of control. Your professional partnership dissolves into a heated academic rivalry where lingering eye contact is definitely - definitely - just anger.
Featuring: excessive caffeine intake, attempts at professionalism (and cooking), desperate hunts to understand magic, and two people so smart they circle right back to dumbassery.