1 - 20 of 370 Works in Alphys & Sans (Undertale)
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Summary
Skeletwins Sans' diary.
(Note: I HIGHLY recommend reading the main Skeletwins story before reading this fic. Spoilers for Snowdin Adventures with the Skeletwins ahead.)
Series
- Part 4 of Skeletwins Side Stories
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The whiteness greeted you as you woke up again. It felt almost suffocating, especially when the only other people with you didn't exactly look or act normal. You just wanted them to emote, even a little bit.
All you wanted was to not be alone but no. You were reborn as Ink after you died in a lonely ditch. Now you have to navigate the vast Multiverse with your knoweledge of your last life. As you get friends and foes alike, you notice that not everything you know is trustworthy. Especially when you're a little lost skeleton with questionable ability to feel.
After all, anything could happen in a place this big.
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Cherry Tomatoes (an idea dump) by WingsofFayt
Fandoms: Undertale (Video Game), Friday Night Funkin' (Video Game)
05 Dec 2025
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With no sort of content online (that hits the vibe i want) i decided to make an account to sort of… dump all my ideas of this crack ship I’ve had for a few years. Maybe a yap sesh, loads of exposition, maybe cute, who knows! But this is my crack ship, and i hope whoever reads it enjoys!
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A Former Royal Scientist’s Research of the Space Time Continuum by stitchthelilo
Fandoms: Undertale (Video Game)
04 Dec 2025
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A little bit of rest during her research could definitely hurt, yet her eyes began to shut anyway. The consequences to this were much more dire than Queen Alphys could’ve ever expected, and after an abnormal earthquake she finds herself stuck within the endless Multiverse.
And for some reason Sans is.. everywhere??
OR
Takes place right after the Alphys Neutral Ending, where a freak accident sends Queen Alphys - better yet, just Queen - out on a travel through the Multiverse.
Series
- Part 2 of Longfics
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Papyrus returns from training late one evening, and decides to ask Sans if he wants anything.
Sans is not there.
Papyrus shrugged it off, knowing Sans was probably at Grillby's, eating that disgusting, greasy food again. He was probably safe, drinking ketchup, telling puns and stories...
But Papyrus had a grim feeling that was not the case.
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No update schedule for this what-so-ever, sorry!! I'll try to write as fast as I can, but don't expect it to be too often.
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The human was not gonna back down nor fight, and Sans, if possible, wanted to avoid a violent escalation of the situation as well. Because, despite the souls’ best efforts, his body had not yet recovered from his escape. Every single one of his bones ached, and he was almost certain that the cracks that already covered a majority of his skull had expanded.
However, the stalemate didn’t last long because, as it seemed, the human had an ace up their sleeve. The outline of a black soul manifested on their chest and, soon after, a bright red button with ‘RESET’ written on it appeared in front of them. Sans barely had the time to notice Killer’s eyes go wide and wonder why that was before the human pressed it.
Sans stumbled onto a snowy path with no grace, alone and lost in an unfamiliar frosted forest. Snowflakes slammed harshly against his bones. They looked so delicate and yet he could swear they left a thousand tiny cuts on him. It was torturous… and yet familiar.
That was the power of a human. No. That was the power of an anomaly.
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or, Fresh out of the Void Color stumbles upon Something New. And, in his attempt to help, he perhaps bites off a bit more than he can chew
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What would happen if sans went missing? And if someone named Sam appeared?
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Or I wanted to make a video for this so I wrote it, I’ve had this idea for a while.
The title is song lyrics from “killer” by The Ready Set
THIS IS NOW ABANDONED.
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Frisk Gets Adopted By A Skeleton (UnderAdoption/AdoptionTale) by Cat_On_A_Keyboard, CheerfulForest
Fandoms: Undertale (Video Game)
15 Nov 2025
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Sans lives alone with his baby brother in an old house on the outskirts of New Home. He raises him to the best of his abilities. One day, he hears the doorbell ring. He opens it and finds an abandoned child. A human child. He has no idea how they got there. The only thing left with the child was a note. Sans reads the note and learns the orphan's name. Frisk.
Series
- Part 1 of Frisk Raised In The Underground
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A field filled with dust and dried blood. A field where the last words and cries for help were drowned by the hits of sword blades.
The war between monsters and humans is underway. Started with fear and a feeling of insecurity, and it could end in any way. Both sides having only one goal: to save their home, from people they once called their friends.
Two sides, one winner and no matter the cost.
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What if the King Papyrus ending stuck?
Series
- Part 15 of Skeletwins Side Stories
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Sans is the Bane Of Your Existence. Pranks and Puns haunt your days whenever he is near. Unfortunately, Papyrus is your best friend, and you'd do anything for him. Even if that means taking care of his brother after an experiment gone wrong turns him into a massive, and even lazier, house cat.
Series
- Part 1 of Turned Into An Animal (Sentence Prompts)
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Momento Mori (So Don't Fuck Life Up, You Don't Get A Second Chance.......Normally) by CrossoverAU
Fandoms: Undertale (Video Game)
02 Nov 2025
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Momento Mori- Latin for 'remember, you must die'
What is death, if not the end of one chapter, and the start of the next. Raine is dead. She wanted to be dead. She made her bed. Cleaned her room. Said her goodbyes. And tied the noose. When that didn't work, she slit her wrists. And when that didn't work, she took her grandfather's gun off the wall and shot herself in the head. That time, she finally did something right. Now she could sleep peacefully....
Why was she awake? She was definitely dead this time, why the hell was she awake?! And is that......Sans?! As in, Sans from Undertale?! As in the game that was one of her only reasons for not killing herself in high school?! That Undertale? That Sans? Why was he multiplying? And is that Papyrus?!
Death hurts. It causes pain to those around it even when it isn't attacking them. Then it comes for them next. If she wanted to get out of the Undertale world and back to her hopefully peaceful afterlife, she would need to show some bitches that before they bled out their marrow..... all over her damn floors?! Dammit Mutt, she just cleaned those!
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Where Do Monster Souls Go When They Die? by Just_AliAnne261
Fandoms: Undertale (Video Game)
01 Nov 2025
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"Papyrus felt... strange. Softer. Lighter than ever before.
He could've sworn he was just in his bedroom a minute ago. He remembered his old, cold bones curled up under the sheets, his soul crying out with deep, painful loneliness. He's pretty sure he just fell asleep in that bed with tears running down his face.
He's never been the same since Sans passed away two years ago.
But now he's on a fluffy white cloud, high in the sky. At least, that's where he thinks he is."
Series
- Part 17 of Skeletwins Side Stories
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Shadows Cut From the Soul by CodePlanTB
Fandoms: Undertale (Video Game), Deltarune (Video Game)
30 Oct 2025
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A few days after the end of the pacifist route, Frisk finds a disturbing entity in Waterfall. They bring their friends to investigate, but they find another world cloaked in darkness. They must try to find the true nature of this entity while working to save the world from eternal dark.
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How many runs has it been?
Not even Chara could count them. Over and over again, they saw the Human kill those they had cherished when they were alive. They had wished to do something about it, and had even suggested to the Human to pick another route only to be in vain. However, when an intervention comes from the Man who Speaks in Hands, they are given an opportunity to give one being the memories of the previous routes.
Garden of LOVE(Level of ViolencE) is a three part series and take on the already popular concept of Dusttale. In the series, Sans's memories are given back to him by Chara who aims to stop the Human's genocide routes.
Series
- Part 1 of Garden of LOVE
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When Sans finds himself unwillingly involved with the work of his father; the next human soul comes into play… how is he going to get out of this with him and his brother safe?
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Sans was starting to feel like there was a little too much on his plate.
With everything going on–the monsters living on the surface now, the angry backlash from the human city, some weird creepy dreams he wasn’t going to acknowledge anytime soon, and trying to work on something that would stop the resets entirely, all the while he still kept up with supporting his brother in his work of being a monster mascot–Sans would say he was completely booked. In fact, he was basically a full library at this point.
Oh, and then there were the skeletons that looked disturbingly like him and his brother that started showing up out of nowhere. That was happening too.
And they sure as hell were not as friendly as Sans would’ve liked.
Or,
Sans and the other monsters are on the surface now, when different timelines suddenly begin converging into his and start spewing out alternative versions of him and his brother. The world was apparently ending, but, hey, what else was new?
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Just a summary of my thoughts of before undertale, essentially.
More stuff on sans and Alphys' relationship, and some other stuff.
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ten to one anthology (on hiatus) by theseventhsmilingfriend
Fandoms: Undertale (Video Game)
23 Oct 2025
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“I CAN’T OPEN THIS BLASTED BOX!! IS THIS SOME KIND OF JAPE?! WHY WOULD HUMANS SELL SOMETHING LIKE THIS?!”
The sound of a trombone plays.
“SANS!! WHAT DID I TELL YOU ABOUT PLAGUING MY LIFE WITH INCIDENTAL MUSIC?!”
“that you love it and want me to do it more?”
“SANS, I WILL DUST YOU.”
“pretty sure that’s workplace harassment.”
“IT IS NOT!”
“is too.”
Envy closes her eyes and tunes them out again as their argument devolves into yelling. She just has to get through today, tomorrow, and the rest of her life. That’s not so bad.(AKA, a less-than-pleasant dojo owner who has too many problems of her own to deal with forgets to take down a "help wanted" sign.)
Please read the before-story author's note of the first chapter!
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Papyrus has always been one of the few characters that Flowey never fully understood
Even now that everyone is finally free, Flowey remains curious...Are there any skeletons inside his closet?
OF COURSE NOT! Just Papyrus sometimes.Or...
Papyrus WAS Gaster
The main story is set in the past, years before the events of Undertale, and it will explain what exactly led Gaster to shatter across time and space and how Papyrus came to be!
It will also fluctuate to the present in a post-pacifist timeline where Papyrus is figuring some stuff out.Series
- Part 1 of Forgettable-AU