1 - 20 of 26 Works in Sans Has Secrets (Undertale)
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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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A year has passed since Frisk has freed the Underground, and their desire to learn more about their friends hasn't stopped there. After asking Asgore about the lack of skeleton monsters and realizing that the mystery behind Sans and Papyrus goes much further than they thought, they set out to find answers. What started as one question quickly spirals, and they and their friends stumble into something bigger than they ever could have imagined.
Summary to be redone as the story goes on.
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Without History (maybe some things should stay forgotten) by Human_with_no_life
Fandoms: Undertale (Video Game)
21 Oct 2025
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After the barrier breaks, Monsters and Humans have learnt to live together on the surface, there is still many mysteries hidden in the underground. Most of them will stay forgotten or buried forever.
Until a ‘promise’ Sans made with Frisk leads to him telling a long and complicated story. His story, well not exactly 'his', but with as many questions as it answers, it seems to raise more. One thing is for sure; this tale will change everything.
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Sans was expecting a lot of things when he and his brother faceplanted into a familiar-but-not carpet.
His brother finding his soulmate was not one of them.
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Sans has put in the bone work.
For fifteen years, he's raised Papyrus.
Not even counting the time loop.
And now some pretentious ancient bones want to have a say?
Oh hell no.
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Said "ancient bones" are mortified.
How were they supposed to know the short depressed skeleton was barely two decades old?!
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It's been four months since the whole world tilted and spun out under Sans, dropping him into the snow in front of a very tall skeleton.
Four months, as it turns out, is a very long time.
Series
- Part 2 of no way off the hamster wheel
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The Stars have become worried for this timeline and left one last gift.
A merging of timelines, all options for the future based on the resets.
How will the underground handle it? And how will Sans cope when the timelines merge for HIM alone? After all, not all monsters are looked at by the Stars, and not all have the Determination to handle their gifts.
Or, Snas has to deal with AU's of him in his head, Pap's notices something is off, Chara learns to like puns, and Frisk gets confused.
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Diamonds in the Sky (Dragons in Your Eye) by Xx_Aconite_xX
Fandoms: Undertale (Video Game)
23 Sep 2024
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Sans was nothing more than a sickly skeleton, confined to the castle for his health while the world passed by around him. He had resigned himself to living like that forever- until, suddenly, he's been sent on a death mission, to slay the most fearsome beast of all- a dragon.
Nothing ever goes to plan, however, and soon Sans finds himself caught in a situation beyond his wildest imagination. Unable to return home, will he submit to the dragon or take matters into his own hands?
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Papyrus had been planning this for a while.
For as long as he could remember, Sans had been taking care of him, had been wearing himself thin and giving up everything for his sake.
He’d tried everything to help. This wasn’t his first resort, or his second, or even his tenth. He’d never wanted to have to do this.
But it was all for Sans’ own good.
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So, I watched a video titled loser, PAPY by Garbage Chocolate on YouTube and decided that the ideas were cool enough to be its own mini-AU.
Over time, Sans realized days were repetitive in more than the day to day or deja-vu. The day was literally reverting back and he seemed to be the only one who knew. It was only after the second genocide run that he realized why.
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Secrets are often kept in an effort to protect the ones you care about. But what happens if the ones your trying to protect are the ones who discover the secret. And what happens if the secret is there's an entire multiverse with multiple versions of you you hang out with daily.
How the fuck do you explain that.
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Aka I haven't written in years but had a idea that was eating me alive, so hopefully this will be at least decent. Also please check notes for two headcanons important to the story.
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He’d first attributed the sudden shift in personality to the rather large hole in the back of Papyrus’ skull, filled with sickly yellow petals that had since bloomed into a golden halo. Not at all helped by Flowey’s injection into his brothers mind, causing both to be constantly in flux, fighting over control of the host body. While distressing and no doubt frustrating for his brother, Sans was at least comforted by the clear distinction between the two. The dissonance gave him a chance to see Papyrus’ old self on occasion.
But now the changes were beginning to settle, meaning all semblance of a chance at normality were rapidly fading away. His brother may now look more like his old self, but he was left living with a stranger, and he couldn’t take it anymore.
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Sans can’t adjust to the changes Papyrus went through after the incident and seeks out Alphy’s help in trying to save what remains of his brother.Series
- Part 2 of Flowey Fusion AU
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After a few resets, Sans and his group are finally on the surface. The kid hasn't made a move to do it again which is great. Sometimes random bouts of pain pop up but he'll be fine.
Well except for the nightmares and the weird shadows he has been seeing around the kid and that flower that is. With all this nausea he doesn't think he can 'stomach' this all-!
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The Strange Crossover Of Dr. Sans and Mr. Latch by orphan_account
Fandoms: Undertale (Video Game), The Strange Case of Dr. Jekyll and Mr. Hyde - Robert Louis Stevenson
21 Nov 2023
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Sans has recently created a potion and decides to try it out on himself for the first time, but things soon go awry, and he creates a new being of sorts, who calls himself Latch. Papyrus, who is unaware the two are the same person, tries to figure out what's wrong with his brother and who "Latch" really is.
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Sans hid so many things from everyone around him. He had gotten used to having the RESETs to undo it when he slipped up, but Frisk had stopped resetting, and that meant that if Sans happened to slip up, he had to face actual consequences.
Like, for example, accidentally admitting his jacket was from a family member while his little brother was in the room under the impression that they only family they had were each other.
TL;DR, Sans fucks up and Papyrus wants answers.
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So It’s mainly based off a little blurb I found somewhere on tumblr about how Undyne has determination like Sans and so she can remember resets, but it starts later, and builds slowly. Sorta like just Deja Vu at first.
“Wait… Haven’t we had this conversation before? I remember talking to you about this yesterday.”
“What are you talking about, ‘dyne? I didn’t even see you yesterday.” -
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You're sitting at a bar, listening to the radio music and reflecting on memories of a relationship that went horribly wrong, despite the best of intentions.
Series
- Part 6 of Sansgust 2022
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Sans loves you. Almost too much. He has played the timelines with you enough that he knows how it ends. His only goal this time is to get that happy ending he knows exists. After all, it's not everyday someone falls in love with you. It's also not every day that someone has a soul trait so rare that it's only spoken about in legends of old - a soul that reflects someone else’s in every shape and form when they become close enough. But what if that soul decides that a certain skeleton is the only one that it wants?
Act 1 - Joker - Ch 1 - ???
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sans and alphys had been friends for forever, and through lab internships, deaths of friends, mental breakdowns, and questionable experiments, they will always have each others backs.
(sans and alphys centric but ill focus on all characters as much as i can.)
Series
- Part 1 of Skewed Realities
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Surface World by orphan_account
Fandoms: Undertale (Video Game), Underfell - Fandom, underswap, More AU's of Undertale
04 May 2019
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Summary
This is a story of the monsters going to the human world.