1 - 20 of 448 Works in Sans (Undertale) Has Issues
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Summary
The thing about soulmates is, no matter what pries them apart, they always...always find a way back together
Chapters 1-3: Prologue
Chapters 4+: Main Story
*This story has LONG chapters. I’m not sorry**This is a rewrite of I Have The Power of Gaster AND Anime On My Side. Same concept, with a bit of a serious feel.*
**Please be aware that this is not like my usual reader-inserts!! This story is in 3rd person pov, very vague description of a female reader. Unnamed (Pet names only). No use of y/n, y/e/c etc.**
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Error of Parallax by marcoandtheskeletoncargo
Fandoms: Deltarune (Video Game), Undertale (Video Game)
04 Nov 2025
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He danced with her in the living room as he sheltered in her house from the rain. However, unbeknownst to Sans, the roof was sheltering him from something far more detrimental- a horrible fate that was fast approaching. Soon enough, he'd realise that he danced for too long, left her house too soon and neglected to confess the truth to Toriel before it was too late.
Soon after she was snatched from his reach, she was replaced with something else.
It wore her face. Her laugh.
It stole her jokes. Her warmth.
And that wasn't all it took. -
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There was no hope.
There was no way out of this place. Sans knew that from the depths of his soul- he couldn't escape on his own. But without any way to contact anyone and no knowledge of where he's trapped, all he could do was try to survive... or maybe just hope for death.
No more resets, after all.
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Happiness is a choice. It is as simple as shutting your eyes.
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Is he really doing this? Does he need to know the time that badly? Is there another solution that he can think of?
He takes a deep breath and closes his sockets.
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Sans has an idea.
Series
- Part 2 of Hackertale Musings
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Unfinished (occasionally dubiously-canon) snippets, deleted scenes, alt povs, pre- and post-canon junk, and some AUs within the universe of Gossip Merchant.
Series
- Part 3 of Gossip Merchant
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Chara lives a lonelly and boring life in her farm near Mount Ebott. Its peacefull but nothing really hapens.
One night after a weird dream, she finds herself climbing the moutain for reasons not even she knows, and there on the ground, she finds something that will totally change her life.
A slow burn fic focused on the daily life of the characters and their relationships, plot may take some time to appearOr alternative title - Im still stuck on 2016 and couldn't find any CharaXSans fanfic i liked, so i made my own
Hope you guys like ituptades slow! Usually once a month!
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That little shindig Tori and Fluffybuns planned is going pretty well.
Sans is having less fun than he probably ought to be having.
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- Part 3 of hole
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The way of a Glutton is a non-canon Reader insert story that takes place in the story of Red Mass, a self AU of Undertale.
You are getting a new job in the City of Paradise, the City of which Sans (Dee) and Frisk built.
Although you want to work in the city laboratory and also fulfill your dream of studying magic, you also get to know more monsters that you have ever seen in your life. And maybe your dorky skeleton boss asks you out on a date?
This story will contain lots of drama, blood and tears.
So be excited for it!
Series
- Part 1 of The Way of a Glutton
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He was gone. No warning, no alert, only taken.
Red is scared, Sans feels the darkness closing in.
It's done nothing but rain since he went missing.
Series
- Part 15 of Typeface: sans-serif
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A strange infection has broken out across the Underground.
Echo flowers have become strangely hostile and aggressive, attacking and infecting monsters and taking over their bodies.
Most of the Underground has become completely overgrown by these dangerous plants, and only a few safe zones remain.
Sans, the Royal Scientist, must figure out a cure with the help of his assistant Alphys, before everyone he loves becomes infected by the echo flowers.
When a human falls into the Underground, Sans must figure out if they're the key to saving everyone, or the harbinger of doom for his friends and family. -
An Unexpected understanding by Ari_Artzzz404
Fandoms: Undertale (Video Game), Underfell (AU)
30 Jul 2025
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when the monsters finally were freed from the underground, the humans were outraged, though that was to be expected, humans tend to be afraid and disgusted by things the don't understand, and they didn't know the whole story, And the monsters were wary and cold towards humans due to this.
therefore, the tension between humans and monster remained at a constant high.
Y/N was a human who wanted to understand. At first they were wary of monsters, they didn't hate them, they knew that at a lot of the things humans say about them are probably wrong, but they never really knew or not, so they were overly anxious around them, especially with a SOUL defect already making them anxious. until an event with a monster makes it clear to them that human bias is true sin, and that it was time to be open their mind and change.
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At first, it felt like déjà vu.
Funny, really, that he couldn’t remember when exactly he started remembering. Things in Snowdin didn’t vary much, but it became unsettling when they stopped varying at all.
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Sans wasn't planning on getting himself a slave. There were just too many mysteries surrounding the human to just let them go. Sans was going to find every little secret of theirs if it killed him. Make no mistake, it was likely to kill him. If only the human would stop sucking up to his brother.
Or in which, the author is sick of people using slave fics to make reader a broken/submissive doll and Sans a dom butthead, so author makes their own story and gleefully tramples over some cliches.
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Take me high and I'll sing (you make everything okay) by Thunder_child
Fandoms: Undertale (Video Game)
04 Jul 2025
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Frisk is turning 18. She'd rather have no one know, but maybe Papyrus knowing won't be so bad.
This is a very self-indulgent fic I wrote for myself at midnight as I was turning 18. If you want to know why the writing is a little all over the place, I was half-asleep when writing. So there. The title is from My Demons by STARSET.
Series
- Part 3 of Undertale Works
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After doing everything the right way in the first timeline, Frisk was compelled to do the genocide route for what they felt were "good" reasons. In doing so, they have broken utterly and become something new. Something absolutely devoted to Sans, and not remotely sane. Now they are striving to fix everything and find their path forward. What the hell is Sans supposed to do now?
(This is not an erotica story - it's a drama / sort-of-romance that eventually gets really spicy)
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Sans Tumbles Through the Multiverse Headfirst by PapilioVolens
Fandoms: Undertale (Video Game)
22 Jun 2025
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Sans has finally managed to fix the reset issue. It only required the deletion of a vital character. The barrier is broken, and time finally begins to move again. Recovery is slow, but Sans finds solace in his dreams. By the time he realizes his dreams of other universes are real, he has already grown attached to their residents. And then he's attacked at home and is thrust into the multiverse proper. He finds things very different from how he expected. His old friends don't recognize him, and some of them appear suspiciously older.
It doesn't take long before Sans starts to suspect that he may have a larger role in the multiverse than he predicted.
I wanted more Classic adventures through the multiverse, so here's my contribution. And cause I'm me, I can't help but try to make a saga out of it.
Features Classic being Classic, strange multiversal mechanics, and a sleep-deprived author who 100% knows what they are doing
Important note: NOT on hiatus, just slow and life being a bitch XD
Series
- Part 1 of STTMH
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When the Kusted Rots, will the recipe stay the same. by MangaanadAnima for silverryu25
Fandoms: Undertale (Video Game)
21 Jun 2025
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Undertale and Underfell meet when most of the Aus gather together let see what happens when they meet after the system goes down.
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A while ago, around... September, 2024. (Feels longer, lol) I posted a few chapters of a fic called Threeplates. I'm trying that AU again.
Comic Sans and Papyrus, and their sibling, Bodoni Ornaments, find a small human child and figure things out about themselves and the world.
EDIT: 10-17-25; I reread this and realized i did grillby's and fuku's voices wrong and it made everything fubar, i fixed it and made some tweaks.
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Another World by Ami_Dinh
Fandoms: Undertale (Video Game), Doki Doki Literature Club! (Visual Novel)
21 May 2025
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Sans realizes he goes through the same events over and over again but doesn't care, right?