1 - 20 of 115 Works in Sans is Having a Bad Time (Undertale)
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Half-Tale: The Fallen by HolmesJaw
Fandoms: Undertale (Video Game), Half-Life (Video Games)
14 Dec 2025
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Summary
Corporal Adrian Shephard, a US Marine Corps soldier assigned to the HECU division, was sent off to Black Mesa for 'cleanup duty'. Despite the hell he went through, the marine somehow manages to escape the dangerous, alien-ridden facility against all odds and, after being 'detained' by the ever elusive G-Man, is then assigned a new mission many years later... to the UNDERGROUND!
Accompanied by Chara Dreemurr, the first fallen human turned apparition, the two journey through the unprecedentedly large Underground for one, very specific goal... but what exactly was it? And is that all there is to it?
In... time, all will be revealed.
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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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You’re young. You marry the wrong man.
You wish you were dead.
Be careful what you wish for, Seven.
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Or, you find yourself Underground surrounded by starving, tortured monsters who know you're the last soul needed to attempt to break the barrier again. You said you wanted to die. Don't back down now.
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- Part 8 of How To Be A Human Being
- Part 9 of I/Me/Myself
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Or: The one where an adult Frisk wakes up after their funeral, back at the beginning of everything. Of course, they know how to navigate all their adventures underground, but... Does anyone want to tell them what kind of sin they committed? After waking up each time, in different timelines, some of which they even know they generated, and others that they themselves didn't commit? Yeah, this isn't going to happen (it happens anyway).
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- Part 3 of Random Writing
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Sans goes through his usual genocide spiral with the kid, but the kid intends on making Sans stand in the middle of the hall until the end of time...
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- Part 10 of Bad Things Happen Bingo
- Language:
- English
- Words:
- 852
- Chapters:
- 1/1
- Kudos:
- 3
- Hits:
- 51
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After Frisk manages to bring W.D Gaster to the Surface, he, Sans and Papyrus are able to continue living as a family.
However, W.D Gaster begins to realise just what his children endured during his 17 year disappearance.Content Warning: Discussion about past trauma, child abuse, underage prostitution, aphobia, coersion, child abandonment, homelessness and child sexual abuse.
Series
- Part 5 of random angst
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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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when you've lived your whole life in the dark, how are you supposed to know to look for the light?
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october 29th : guilt
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- Part 7 of whumptober 2025
- Part 1 of UNDERRAVEL
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Spending Spring Break Underground by 4Trixs_Animations3
Fandoms: Undertale (Video Game), 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
29 Oct 2025
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Once upon a time many centuries ago, the world was ruled by two species: Humans and Monsters. Both of these creatures thrived together using their special talents to help one another. That was until the humans declared war on the monsters out of the blue. This led to the monsters to be banished beneath a mountain.
But rest well when I say the humans suffered their karma. Without monsters they soon lost their magic, along with their way of life. They developed their own powers called quirks, with this power came the raise of heroes and villains. Quirks were quick to spread until only 20% lacked them.
It wasn’t long before magic and monsters were reduced to legend. This led many to climb the mountain to see if the legends were true, only to never return. This was because of the heartbroken monster king who put a bounty on every human who fell.
When the last human fell, the monsters were ecstatic. Finally they’ll be free to wander the surface and feel the sun and the rain again! But unbeknownst to them, they have become even more trapped than they had before. With each reset the monsters were forced to live the same day over and over without anyone knowing ... .Well, almost everyone.
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Those Handplates Aren't Coming Off Anytime Soon by marcoandtheskeletoncargo
Fandoms: Undertale (Video Game), Handplates- Undertale (Video Game)
14 Oct 2025
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I took a scene from Handplates (by Zarla) and added some extra depression seasoning onto it.
It's the reconcile scene, but Gaster gets in the feels and then Sans has a moment after where he *almost* makes a bad decision.
i wrote this high on drugs of the medical hospital kind so sorry if the grammar isnt great or if there are errors. wrote this in one sitting lolVenting a lot of my own feelings through this fic so enjoy the angst
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- Part 4 of random angst
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Some random thingy I wrote in the middle of the night- :P
Series
- Part 1 of Undertale/Undertale AU oneshots :>
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Same You, Different Font by radskull69
Fandoms: Undertale (Video Game), Deltarune (Video Game)
09 Oct 2025
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Ah yes. The classic ‘’Heather’ convinces the skeletons you’re an evil human so now it’s a EVIL reverse harem’. Right?
Oh? But what’s this? A TWIST?
Sans couldn’t live with himself after what happened to you, going near insane after you’re gone. So behind the others back he uses the machine to undo what he did, except it didn’t. He can still feel his sins crawling on his back.
Oh well, it’ll all be worth it once he has you back in his cold hands again. Screw the other skeletons.
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The king has fallen.
In the devastation left in the human's wake, a new king is needed. Papyrus steps up to the challenge, assisted by his brother.
Sans is sworn to obey the crown, bound by the Delta Rune. Regardless of who wears it.
But when dark alternates show up and threaten war, Papyrus has to make the hardest decision of his life, and Sans finds out the chains that bind him might not be as secure as he'd like.
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He was a bad brother. He knew that. He didn’t need all of this shit to happen for him to acknowledge that.
...Whatever it is that’s happening at this point.
Or
Papyrus made a stupid mistake and now sans is gone.
[THIS WILL BE REMADE]
Series
- Part 1 of Multiple scraps/unfinished works
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It's been a while since Frisk abandoned the underground, leaving the residents sulk into their misery, drained of hope or the courage to live life to their fullest, hurt by the betrayal.
Sans didn't expect Papyrus to be like the other residents.
...
The idea is inspired by the song "Comedy", more specifically, by the lyrics "If you wake up in a house that's full of smoke, Don't panic. Call me, and I'll tell you a joke."
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And so the rotted pits stared into the frozen beyond
Distantly remembering being frustrated, proud, angry.
Devastated.
But they were too tired for any of that now.They turned back to the deceptively welcoming house.
Still there, even after everything.
It shouldn't be
A house is only as good as the people in it.ORRRRR
Sans is handling things AWESOME after everyone he loved has kicked the bucket
Yessiree no negative feelings here
Insert Steve Griffin Death Pose -
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Summary
Unfinished (occasionally dubiously-canon) snippets, deleted scenes, alt povs, pre- and post-canon junk, and some AUs within the universe of Gossip Merchant.
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- Part 3 of Gossip Merchant
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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. -
Fatal Obsession: The Collapse of Nagito Komaeda by TheMightyNooters
Fandoms: Undertale (Video Game), Super Dangan Ronpa 2, Dangan Ronpa Series
20 Jun 2025
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Nagito exploads bc he is so inlove with Sans11!!!111!!!!!!!!1
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How Do You Kill a Time Traveler by ZJFoster (toxicnuts69)
Fandoms: Undertale (Video Game)
15 Jun 2025
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Summary
let me describe to you a hypothetical situation. you are a time traveler. you work in the business of space and time and whatever distortion that may be caused by any such anomaly. timelines jumping left and right and the space-time continuum would be bursting at the seams if this loop wasn’t trapped in its own bubble, making your job of discerning who being positioned where in time in space irrelevant and admittedly— a lot easier. your job is to do whatever it takes and whatever you can to shut this down, even at the risk of your own life. you just wish he wasn’t here with you. even though he needed to be. couldn’t he have taken the day off? you can’t help but wonder how many times you’ve stepped out that door.