1 - 20 of 39,967 Works in Sans (Undertale)
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Summary
The nightmare gets into Au without its powers. Even the author doesn't know what will happen.
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Expendable at door 30!! by PaintcoveredSeal
Fandoms: Pressure (Roblox), Undertale (Video Game)
16 Jul 2025
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Summary
What happens when an experiment gets sent out of their own universe away from the two people they considered family and right into a group of skeletons and their annoying girlfriend that hates the silly sea.
Bad summary I’m aware.
I’m aware that the title is bad, no I’m not changing it. -
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Summary
Monsters can get pregnant obviously, that's how they're there. But what happens if a male monster gets pregnant? More importantly, how is Sans able to get pregnant? And how will he tell Grillby?
Series
- Part 2 of Undertale Life
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Summary
What if the player never existed?
What if instead of Kris, Noelle fell into that dark fountain with Susie?
What if Kris has no association with the Knight and knows nothing of the dark worlds?
What if the soul that was desperately needed to seal fountains was Kris's and Kris's alone, yet the human is blissfully unaware of how desperately they are needed? Of the leadership fated for them?
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Kris watched as Noelle walked out of the classroom with Susie, sighing softly.
Whatever. Honestly...they knew they should care more but...Susie never bullied Noelle anyway....
However...for some reason after that, Noelle and Susie completely disappeared for the rest of the fucking day!?!?! And for some goddamn reason when they came back Noelle is randomly seeking them out and Susie is acting weird as fuck, and they're somehow a lot closer??? And for another unknown goddamn reason Susie WILLINGLY asked to do their project.
What the fuck is going on??????
Whatever. They don't need to be a part of this bullshit. At least Berdly is just as confused as to what the hell is going on with their project partners.
Series
- Part 1 of Deltarune Fanfiction
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Summary
You're an SSS ranked hunter who fights demonic beasts for a living and hangs with their cool roommates in their free time.
Sans was just trying to figure out how to stop dungeon bursts from wreaking havoc on the city when he landed you, Papyrus and himself in an alternate universe. But there's still room for things to get stranger in the house of mirrors you start to call home.
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UnderTime by WalrusSilverfish
Fandoms: UnderTime (by WalrusSilverfish), Undertale (Video Game)
16 Jul 2025
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Summary
The first story of the series. Follows our protagonist through his rebirth and until he (re)enters the Multiverse.
In case you couldn't tell I suck at summaries, I'll get better eventually, probably.The Major Character Death Warning is temporary and happens multiple times btw, it is a little confusing at first but you will understand as the story continues.
Prologue: Rootverse's Collapse (1)
Arc 1: Rebirth (2-7)
Arc 2: Meeting Familiar Faces (8-?)
Sub Arc 2.1: The Teeth Incident (20-41)
Sub Arc 2.2: The Magic Incident (42-50)
Sub Arc 2.3: Time For Shopping (51-59)
Intermission: 1st Major Time Skip (60-62)
Sub Arc 2.4: The First Human (63-?)Series
- Part 1 of Miseries of Metempsychosis
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Wrong Warp by Hideyoshi Faz (FreddyFazbutt)
Fandoms: Deltarune (Video Game), Undertale (Video Game)
16 Jul 2025
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A fic in which Frisk dies in undertale and is reincarnated as Ralsei's little sibling in the closet dark world. How will the prophecy be affected by the addition of Frisk?
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Movie night part 2, the squeakqual. Kris and Susie end up in a "definitely just friends nothing else going on here nope" position, but really they're just unconventionally cuddling.
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Crash Landing Into A Whole Other Reality: Skeletons Edition by Hyacinthyl
Fandoms: Undertale (Video Game), Minecraft (Video Game)
16 Jul 2025
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Summary
This story takes the trope where Monsters have been on the surface for about four, going five years. Then, of course, a skeleton tinkered a bit 𝘵𝘰𝘰 much and brought in several versions of him and his brother. Then not even a year after that, he tinkered with it 𝘢𝘨𝘢𝘪𝘯. But instead of bringing (Y/N) into their world, 𝘵𝘩𝘦𝘺 got transported into 𝘩𝘦𝘳 world.
A world where Humans, some sentient Mobs species 𝘢𝘯𝘥 hybrids roam the many biomes in this strange place. Co-existing not so peacefully; wars tend to happen often, and who's to blame them? Sabotage and betrayal happen, whether it be intentional or unintentional. Nevermind the fact that instincts between species collide with each other. But it helps keep you alive and hey! Most only live thrice!
A story where Reader is a sentient skeleton, is the head chief of a small village, finding out about a jumble of skeletons, goes to skeletons, befriends them, and not so subtly coaxes them into joining her village, and tries to help them get used to her world. Keyword, 𝘵𝘳𝘪𝘦𝘴 𝘵𝘰. Can't these boneheads recognize the 𝘐𝘕𝘛𝘌𝘎𝘙𝘐𝘛𝘠 in her actions? Its not like she's got ulterior motive- or seeking a datemate- well, not yet anyways... Wait what?
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Summary
Rather than the selectively mute child who let things flow without any thought of disturbing the pre-established script, it was the mafia boss (in training) who descended to the UNDERGROUND instead.
And Sawada Tsunayoshi never like it when someone tried to chain his will down like a mere puppet.
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Killer’s always been good at laughing off the things that should scare him. The liquid hate burning in his sockets? Just part of the deal. The endless missions for Nightmare? Just another day. But lately, something’s wrong. The world blurs at the edges, shapes smear and double, and no matter how hard he tries to clear it, the darkness keeps creeping in.
He can’t let the others see. He can’t slow down. But as his vision fades, so does the fragile line between control and collapse, and in a world built on violence and survival, there’s no room for weakness.
Tags and warnings will be updated as the story develops.
Series
- Part 41 of Undertale Fics
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Instead of dancing alone, I should be dancing with you by xpswag
Fandoms: Undertale (Video Game)
15 Jul 2025
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Summary
Last year of high-school; exams, friends, recess. Cross shouldn't be nervous, but this year was the year a new person will enter his life: Killer. Between home, struggles and a lot of gossips (mostly gossips), Cross will have to work on himself. But with this new boy invading his thoughts, it won't always be easy to focus...
Especially when , after some mistakes, he will have to repair things like he can.
Aka Cross and Killer are two cringe teenagers (probably) falling in love with each other.(high school and human au as well)
Series
- Part 1 of UTMV HighSchool/Modern AU
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A raid on a supposed monster traficing facility leads to a lab filled with monsters and a strang new anomaly, a pale translucent being that seems to have once been human no longer fits the description. Fallow her story as she rediscovers her new self and builds a life with the help of those around her.
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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)
15 Jul 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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Frisk has always been clingy when it came to Sans. At first, it was adorable, but as Frisk has grown up and developed curves, it’s become harder and harder for Sans to ignore.
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Distant Souls by Kaboom91
Fandoms: Undertale Yellow, Undertale (Video Game), Deltarune (Video Game), OneShot (Video Game), Heartbound (Video Game), Ib (Video Game)
15 Jul 2025
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Summary
The soul is an important part of a persons identity, the accumulation of a person's being. But different worlds play by different rules, so when a force trapped between worlds starts tampering with those worlds, things start to come apart. It'll take the help of a Fun Gang, a Savior, a young girl, a boy looking for his dog, a small cowboy seeking justice, and an incredibly determined human to save all their worlds from the ever looming darkness.
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Beyond the Void by Ophidio
Fandoms: Undertale (Video Game), Five Kingdoms - Brandon Mull, Wings of Fire - Tui T. Sutherland, How to Train Your Dragon (Movies), Stray (Video Game)
15 Jul 2025
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Summary
The multiverse has never been safe.
The Undertale multiverse. Quite the phenomenon, yes? Yet, there's something wrong. A rogue deity is messing up the multiverse. Another rogue deity is trying to screw the first over. Error, the destroyer, goes missing. And it seems he started a chain reaction as more Sanses are unfortunate enough to fall into the Void. Plans go awry, and friends must be separated for the sake of survival and the sake of salvation.
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Not a single character is canon. I make my own interpretation based on how things could be, not how they are.
This is loosely based on the *forced god of destruction* concept, but it's in the background.
The entire point of this fic was that I wanted to throw Sans AUs into as many fandoms that I have not/rarely seen it in as possible.
Tags will be added as the story progresses. -
Corrupted Rebirth by SoothingEpione for BookwyrmFinallyGotAnAccount
Fandoms: Undertale (Video Game)
15 Jul 2025
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Killer's just chilling in his dead world when suddenly there's a grumpy, goopy child in his face demanding his negativity and just refusing to leave him alone. Who's he gotta kill to get some peace and quiet around here, seriously?
a request done for my beloved Bookwyrm
Series
- Part 1 of BBverse
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Summary
If you haven't seen my TADC or Murder Drones ones, quotes from the Perchance generator or my last braincell depending on how I'm feeling lol.