1 - 20 of 224 Works in Alternate Universe - Aftertale (Undertale)
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Paper Jam makes a horrible life decision, and is now stuck sharing a body with his idiot parents.
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System Error: Accidental Acquisition of Children by Frikisbits231
Fandoms: Undertale (Video Game)
05 Sep 2025
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Error slid down, glued to the tree, his back to the ground, into the lush green grass on the ground. Later, he'd take a look at his current situation and possibly eliminate the place without a problem. Meanwhile, Error was resting, leaning against this comfortable, curvy tree, closing his eyes to feel something, something of the place.
Feel... the familiar ambient magic?
Still no monsters, humans, or standard souls around. Well, no one could hurt him if he got some rest, right?
This time, he mentally prepared himself and repeated the safety tests he felt like a mantra so he could get some rest.
He fell asleep shortly after.
…
Sweetness with hints of security, calm, and the tranquility of dawning rest captured his senses. Something... familiar. Like... like chocolate melting on his tongue. He didn't know how he recognized that either. Still, he pulled the tongue out of his space, to capture it. He caught the sensations, almost becoming overwhelmed by them.
(O: The one where Error acquires an abandoned baby bone, which is, of course, his offspring too, yay...)
Series
- Part 3 of Glitches & Errors Fics
- Part 2 of Random Writing
- Part 1 of ❤️🩹💞 Caring for Babybones 💞🥰
- Part 1 of Oh, look at a fanfic with one of the fanchilds!
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Geno and Error were just good friends, nothing more but Fate decided that maybe things can go more interesting, afterall the balance is in the line, but they seem to be perfect to use.
Geno's life gets fucking ruined
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do you like me better underneath the sunlight? by MaddieMare
Fandoms: Undertale (Video Game)
23 Jul 2025
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With monsters freed from the Underground and Geno rescued from his imprisonment in the Save Screen, it should have been everyone’s happy ending. However, Geno's been having some noticeable trouble adjusting to life on the Surface. It’s almost like he’s waiting for something… or someone.
Thankfully, an “old friend” seems to have reintroduced themselves back into Geno’s life - and for the better!
Now, if only he would properly introduce this mysterious companion. Everyone is just dying to meet them!
Series
- Part 1 of three years after...
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Settling into a new world is a lot easier in theory. Some people are much better at it than others.
Series
- Part 2 of Gathering loose threads
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The World of Era v2.0 by SapphireMoondancer
Fandoms: Original Work, Undertale (Video Game)
24 Jun 2025
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They say every action can cause rippling effects on the world at large. So what does this mean for a prophecy of peace? Is it really that simple or is it something more? Let's not forget the multiverse is larger then one thinks. After all a blue bird may rest in any tree she wishes, not just the tree of paradise.
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- Part 1 of Overworld
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Unwilling to follow Geno's plan, Sans is thrown into another Genoside run by him, to "See his perspective" to "Save everyone" but as the hours pass, and the player' becomes more unpredictable, creating a way out himself seems more tempting. But his methods of doing so slowly become more deranged by the second.
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Geno can't get Sans to listen to his plan, Sans is so stubborn and determined to not end up like Geno, he accidentally ends up pulling a Dusttale on his AU.
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Considering both his brothers needed glasses since they were very young. Fresh can’t believe he just realized he needs them too.
Series
- Part 33 of UTMV Oneshots
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Error had always assumed in one way or another Fresh would be a constant in his life, Just as their brother Geno is for both of them. but Fresh never picks up the phone if he's the one on the line.
Series
- Part 32 of UTMV Oneshots
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I seek the stars above the world to be the guides by heckinghecc
Fandoms: Undertale (Video Game)
24 May 2025
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“Too much built up in his gut. His fingers were tingling; Error needed to go. Where would he go? He didn’t know, but he didn’t care as long as he left. His magic itched for release, for destruction.
The Destroyer blindly ripped a portal open, hurtling through without a second thought.”
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Error, in a manic haze, stumbles into Outertale, tunnelvisioned purely on its destruction. When he looks up, though, he freezes in place. His mind abruptly goes quiet, overtaken by the awe of what he sees.
Rather than firing his blasters, he sits and watches the stars.
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Discover the new (and improved) Tales of Infinity with a fresh Error Sans retake never seen before.
This re-take directly takes the askerrorsans comics and replaces Error Sans with a brand new Error, designed by me. Uncover the mysteries of Infinity Error, the purge of all glitches, and the omega of reality. Will Blueberry and company be able to defend, or will they fall under his treacherous strings of misery?
This story is the first part of three other stories, being a prequel to "Tales of Pragmatism and Fabulism," "Zero Tales," and "Kháos Reapertale."Error Sans is owned by loverofpiggies or Crayon Queen. Also inspired by Forced God of Destruction Error.
(English is not my main language, so there may be some grammar issues.)
Series
- Part 1 of Markings of the Cosmos
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Cosas que quiero escribir ya, pero por la narrativa no puedo aún: Ya aquí by Frikisbits231
Fandoms: Undertale (Video Game)
18 Apr 2025
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¡Hola!
Esta nueva obra me servirá para poder escribir–lo que dice el título– y agregar dibujos que se me ocurrieron al momento, para mi serie de "Desplazamientos (forzados) en el multiverso" y en general los fanfics qué hay en ellas.
- Genocidio perdido en el multiverso.
- Las (Des)Aventuras de (After)–"Sans".
- Gemelo negativo: Lejos del árbol de mamá.
- Código espacial estrellado (Aka: Outer sin Tale)
- (y probablemente más, fanfics que todavía no escribo).¿Actualizaciones? Todavía no tengo días fijos.
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Reaper gives Geno some flowers
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It’s Snowing | (Dance!Sans x Geno!Sans Oneshot) by marismedley
Fandoms: Undertale (Video Game)
05 Apr 2025
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A little hypothetical where Dance helped Geno, who has now escaped the save screen. The loop has finally stopped, and for the first time, Geno gets to experience some form of peace.
This was a commission I got! Feel free to check my tumblr of the same username if you’d like to get your own!
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Where I'll put any fic inspired by Megalosomnia, as well as my own AUs about it.
Check out the creator (I don't know if this even needs to be said but please be 18+, same goes for all my works) :
tumblr : https://megalommi. /
pillowfort : https://www.pillowfort.social/mmishame
twitter : https:// /megalommi
Series
- Part 5 of Undertail hypnosis series
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One Shots Mixtos (Sanscest / Sansby / Sanscest + Grillby / +18) by jack12frost
Fandoms: Undertale (Video Game)
20 Mar 2025
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One shots diversos de estás relaciones
Tenemos:Dreammare
Kustrad
Dustberry
Horrorlust
Crosskiller
Sansby
Y más
Series
- Part 3 of Sansby/Sanscest Multiverse
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A collection of inane nonsense (ranging from Error being reincarnated as Palette to Dust finding a new love for the color pink) circling around the many AUs and Multiverses of the Undertale world. Some stories will be connected; Others will be random one-shots.
Stop by and see what treasures, or horrors, you can find.
Series
- Part 1 of Collection of Oddities
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A story about how Reaper met Geno
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It all started with an overheard conversation, then an idea that was carried all the way to you.
You had built these walls for a reason (both emotionally and physically) to keep those you loved safe.
However, walls don’t stay up forever and can break before crashing down and that’s exactly what you feared because it meant facing everything that you kept outside.
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A Sans no le habría importado mucho ser confundido con su contraparte alterno, no, de hecho, Sans lo tomaría usualmente con gracia. Si… Bueno, eso no es algo que pueda aplicar a esta misma extraña situación en la que se metió “accidentalmente”.
Series
- Part 1 of Glitches & Errors Fics