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December 9th - "Where did all of this mistletoe come from?" by kitkat_fic13
Fandoms: Undertale (Video Game), Deltarune (Video Game)
10 Dec 2025
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Prompt 10: "Where did all of this mistletoe come from?"
Sans is using his telekinesis to repeatedly teleport mistletoe above the two of you. (˶˃ ᵕ ˂˶)
I don't care if this isn't how it works TvT, it's the only way I could think of making this prompt work...
Plot: pacifist run, but for some reason the monsters haven't left the Underground yet. Listen, I didn't think this far ahead...
Sorry if it's ooc!
DISCLAIMER: These prompts are from a tumblr prompt list linked here.
Series
- Part 9 of 25 Days of Christmas 2025
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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 you got woken up in the middle of the night by your new neighbors... no biggie! You're sure they're just excited to be in a new (cheap) apartment. So you decide to introduce yourself to them when they get settled in.
But to your surprise, your new neighbor just so happens to be a skeleton!
"Oh!" You say, surprised by your neighbor's appearance, "Uh hey! Welcome to the unit, I'm your neighbor"
"oh! hey i'm sans" He smiles, lazily copying your initial reaction.You hold your hand out to shake, he looks at your hand for a moment before accepting it.
when all of a sudden...
PPPPPPRRRT!
Was that a... whoopie cushion in his hand?
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A creative slump sends you searching for inspiration in the wilderness, but one misstep lands you under a mountain instead of on top of it. As you navigate a world filled with puzzles, quirky monsters, and an unsettling sense of déjà vu, a certain skeleton keeps popping up—startling you with his sharp wit and toothy grin. There’s something about him, though… something your heart can’t ignore, as if it was always meant to lead you here.
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(Abandoned fic prototype - see second work in this series for more recent version)
For years, you've worked at a Hillside Savings bank as an advisor. You've answered calls from customers trying to help them out as best you can. And even when the monsters came out of the mountain the town over, you advised them the best you can with their new lives aboveground. And you've been doing an okay job so far, you think.
But then your boss puts you on an outside contract, helping a certain monster superstar reach fame with humans, as well as be wise enough with his money to stay afloat.
On paper, your resume says you've got the skills to make it work. But there's more than numbers and charts to deal with in showbusiness, especially with an eccentric individual like Mettaton. And not everyone is friendly towards the new monster population.
Series
- Part 1 of Spreadsheets and Stagelights
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A short work around Frisks' personal torment being stuck within the resets. Reader is not meant to be Frisk despite my use of 'you', moreso meant to be narrated by Chara.
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If Angels Have Halos Do Skeletons Do To? by Tiddlywinks9
Fandoms: Undertale (Video Game)
07 Dec 2025
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After three years of dating you find yourself pregnant with Sans' child. You find yourself alone as Sans dumps you not believing the child is his. Managing single motherhood and a job at the flower shop you find love once again with another skeleton in a orange hoodie who strangely looks like your Ex's brother
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For as long as you remember, you've only known nothing but cold and the feeling of worthlessness. You once had a source of light in the dark but it no longer exists. Will you find it again with your clouded thoughts and memories? Or will you succumb to the rising waters and drown?
In which, you are an AU sans with severe depression, self worth issues and hazy memories of yourself—just wanting to go home…
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Alternative Title: I Found Myself In An Isekai Styled Game Of A Game I Barely Know
How’d I get so lost that I found myself in a different dimensional plane?
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“why is it… every time i see you, your flavor text is always written as ‘confused’.”
“… It’s my default….”
“i find it funny how you sound both confident and confused with just that.”
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Basically you fell in the middle of the Underground and you just remembered this is a game you played once and never thought about it again. No amount of isekai mangas, reincarnation manhwas, and magical manhuas could ever prepare you for what you should do in situations like these. Because honestly, the fact that you know absolutely nothing outside of playing the neutral route was already a disadvantage.However, you can’t remember if there was an element to the game that included the enslavement of the whole monster race after they got out of the Underground.
Nor can you remember that there was any sort of color to the status windows that keep randomly popping up out of nowhere. Not that you were complaining since these status windows are what keep you alive from this… chaos…
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You're a hardworking girl that has gone through some shit, maybe too hardworking. Okay, maybe your overworked with no time for yourself. But thats okay! At least you have your cozy bed to go to and-- you're not home. Why are there three skeletons chasing you? Whats with the sludgey tentacled one?
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Demon Hunting is practically the family business.
When you were a child, a demon killed your entire family. You were taken in by the same guild your parents worked for. The last demon hunter of your family, you want to prove that you can succeed in the legacy. You trained your entire life to take vengeance on the creatures that ruined your life.
You finally got your chance when your initiation exam was scheduled. Fate decides that you will change history in a slightly different way than you had thought. You never could have anticipated running into the Seven Deadly Sins themselves on your first night out.
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It was hard to leave your old home, the only one you had for so long.
But since you fell, you're life has only been better. People rely on you, people care about you.
Some maybe a little more than others.
You just hope no one blabs to the queen. -
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How did Crossbones become Crossbones? I have wondered this myself
This is based on Canon facts though mixed with headcanons
(I will eventually turn this into a comic)Taking place Post Pacifist Route, in the Starlight Isles after the hangout with sans.
Chara wonders why sans became crossbones, well, why did he?- Language:
- English
- Words:
- 1,903
- Chapters:
- 1/10
- Kudos:
- 3
- Hits:
- 33
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Persephone (Undertale AU) by Get8008
Fandoms: Undertale (Video Game), Multiverse-Fandom, Sans Aus- Fandom
02 Dec 2025
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(Y/N) or Persephone for her Alternates, was created in a lab. Her mother being the reason of her sad existence, and one day everything changed (Y/n)'s universe was just an empty void. Then a familiar old friend came to her rescue, but he changed but so did she. She has to put up with the others who live with him and follow him, while she tries to find herself and her new 'freedom'.
Her past mistakes could be her downfall or help the monster she used to love.(This is an Au where you are the only variant of yourself, but your mother is like Sans that she has many variants and mommy issues come to play XD)
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After your friend annoys you into a hike on Mt. Ebbot against your better judgement, you get lost and fall into the underground.
There is no way for you to make it back home... Or is there?
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The taste is what drives you. The smell motivates you. The feel of dust between your fingers, the sound of screams and begs echoing in your ears, watching them dissolve right before your eyes.
The sensation of LOVE filling your body.
You had long grown used to the feeling of gaining level after level, over and over all for your entertainment.
When it was all ripped away from you, the emptiness was too agonizing for you to truly focus on your newfound lack of flesh and the magic seeping from your bones.
Kill first, ask questions later.
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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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You were just walking home. A tear in reality split open underneath your feet and suddenly you were falling.
Falling
FallingThen you fell up and onto the tiled floor of a basement lab.
Now all of a sudden you're in another world and surrounded by 6 strange skeletons (plus one's brother).
Being terrified of all things horror and monsters, what are you to do?*Will contain mature themes but no smut*
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You're a grad student at a house party. How many skeletons are you running into there? At least one you didn't expect.
(This explains nothing. Please read if you like Sans/Reader romance slice of life with plot, character relationships, fluff and eventual smut. Underfell headcannon is being used.)
(Time for a second note to reemphasize PLOT. Drowning in plot. Plot for days. Send help.)
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It's been roughly a year since monsterkind has been freed from Mt. Ebbott.
You mind your own business, glance at the news every so often, and keep moving forward. You have your own problems to deal with; monsters are not one of them.
That is, until you bump into the King of Monsters himself, completely on accident.