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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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Summary
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.
P.S: Chapters will most likely be short, but to make up for that, updates will be as frequent as I can manage.
Series
- Part 2 of Longfics
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When exploring the underground with Toriel, she and you encountered a monster never seen before. She tries fighting off the monster for you, but it was too quick to be damaged. It uses its hypnosis eyes to make Toriel completely hypnotized by the effects. The monster fled the scene, leaving you with Toriel still hypnotized and submissive…
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After Frisk killed Agore and left the underground, the kingdom was left to fend for itself and Mettaton took over despite Undyne still being around, which she clearly stands against. And there will be bloodshed in the process...
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The past was once so beautiful. . .what happened?
Once upon a time, a human entered the Underground, killing monsters seemingly at random. But once the carnage had unfolded, it was found that the human had destroyed almost all of the pillars that kept the Underground in order. . . all except one.
Five years later, another human fell into the underground, but this one was different.
This one was missing something. . .
- Language:
- English
- Words:
- 3,266
- Chapters:
- 1/?
- Hits:
- 4
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In the wake of the human's devastation, Papyrus was made king, and his brother Sans was made to suffer the consequences of his own inaction. Papyrus has a lot to live up to, and as time goes on he is forced to face the past and make a grave decision for his people's future. (Speculative story about the King Papyrus neutral ending)
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An Undertale au where it takes place after neutral ending with King Papyrus ending while Toriel, Undyne and Mettaton are alive which is not supposed happen to get this ending. However... This experiment let's see what else will change?
- Language:
- English
- Words:
- 2,134
- Chapters:
- 1/?
- Comments:
- 1
- Hits:
- 7
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Summary
This takes place in a post Underfell King Papyrus ending.
Struck by under population, King Papyrus makes it law that all monsters left alive by the murderous little human have to procreate. This leaves Fell!Sans and The King himself in a tight spot. There are no female skeletons left in the whole Underground and both skeletons are sure they are the last of their species. Fell!Sans proposes something. With the help of the first Royal Scientist's machine to travel to other universes, he will find mates for breeding purposes.
Tale!Sans is having his first sub heat as a female. This happens when there are only males left and the strongest one undergoes a gender swap. He knows this means Papyrus will have to be his mate.
That won't do. They are brothers, for the Angel's sake! So he does what he does best, HE RUNS.
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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).
Series
- Part 3 of Random Writing
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Mettaton and Muffet become the king and queen of the Underground after Asgore's tragic death. Will they do a good job or is the power getting to their heads?
This was originally supposed to be an AU so if it doesn't follow the timeline perfectly or characters act different, that's why.
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What if the King Papyrus ending stuck?
Series
- Part 15 of Skeletwins Side Stories
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“Since you left…Things have gotten really strange.”
Papyrus is cracking under the pressure of being king, and Sans is busy reminiscing of how much better things could have been.
The aftermath of the King Papyrus neutral ending.
- Language:
- English
- Words:
- 1,471
- Chapters:
- 1/1
- Kudos:
- 8
- Hits:
- 62
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Summary
After Asgore died, bygone king handed over his kingdom to young, inexperienced replacement, in face of his close friend, Mettaton, who, as it would be expected from young, completely uneducated in politics and economics person, who thinks, that being a king is just being richest and coolest let the kingdom down in total corruption, unemployment, poverty and hunger, which, obviously, didn’t make citizens happy about it, so the decided to rise up against him.
[spoilers ahead]
Seeing such disrespect and disobedience from his people, Mettaton takes dark turn and to punish rebels, he leads kingdom from unruled by anyone kingdom to land of dictatorship, making everyone regret.
Still, as being a poor little creature himself, even after doing bad and cruel things, he doubts in his actions, still being scared of the responsibility, but after being convinced otherwise losing his mind turning into money grabbing control freak, who shows no mercy to anyone. Literally anyone.
Yet now, kingdom of disaster and despair waits for a strong person to stand up against cruel dictator.- Language:
- English
- Words:
- 3,705
- Chapters:
- 1/1
- Bookmarks:
- 1
- Hits:
- 12
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What Dreams May Come by runicmagitek
Fandoms: Undertale (Video Game), Deltarune (Video Game)
30 Oct 2025
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Summary
Each night, he awaited his king’s return. Mettaton always came back, always retreated to his bedroom after a tedious day of ruling the Underground. Tenna wrung his hands and bounced on his heels, eager to begin. No need to rush anything, though. Be calm, take it easy. Mettaton would let him know when he was ready. So Tenna waited as he shrugged off his royal garb. Definitely never tired of that show.
“Alright, handsome,” he said upon settling into bed. “What do you have for me tonight?”
Tenna watches the one who saved him rise to fame, then power. The least he can do in return is keep the king thoroughly entertained.
Series
- Part 8 of Mettatenna for Kinktober 2025
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For now, things are okay... right?
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But Hope Remained by theriveroflight
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
08 Oct 2025
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Summary
What remained after Pandora's Box was opened? What stays behind when everything else is lost?
In an Underground where almost everything was lost, one thing remains: the fusion between the SOULs of Kanako Ketsukane and one fallen human.
But Ceroba is trying to learn from her past mistakes, and has some apprehensions about Kanako being used as just a tool.
Alphys, now queen, is trying to learn as well -- to be more open about things, even when they scare her.
But how much is "trying" really worth when compared to the harm inflicted?
Series
- Part 1 of pandora & hope
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Welcome to My Seap. by WhatamIDoing_GoodQuestion
Fandoms: Undertale (Video Game), Deltarune (Video Game)
08 Oct 2025
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Summary
Frisk notices they're low on healing items before they face Undyne and are confused as to why the weird thing controlling them didn't get any more. Having realized that said thing is absent, or at least not actively controlling them right now, they make the choice to go and check out a path in Waterfall, they had noticed beforehand that the thing hadn't. Maybe they'd find a shop or something there, or maybe it would just satiate their curiosity.
However, while they explore this new area, they meet a new monster they had never seen before.
Series
- Part 2 of Darkners? How About Monsters!
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After the events of an Undertale neutral-pacifist ending, Napstablook reaches out to Shyren in hopes of rekindling their friendship. Things go somewhat well.
- Language:
- English
- Words:
- 504
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 17
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Summary
Toriel shows Sans a bedroom.
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Starlo's trying his best to hold onto hope. Not that there's much of it left these days.
(Starlo POV of events from "But Hope Remained", with some connective tissue between them.)
Series
- Part 2 of pandora & hope
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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.