1 - 20 of 33 Works in Siblings Papyrus and Sans (Undertale)
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Error of Parallax by marcoandtheskeletoncargo
Fandoms: Deltarune (Video Game), Undertale (Video Game)
04 Nov 2025
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Summary
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. -
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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Summary
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
Series
- Part 4 of random angst
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Horror reaches the surface. Unfortunately, this doesn't come without strings. And annoying ass people.
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Frisk is your baby and you’d do absolutely anything for them. Every bit of money you make from your three jobs goes to them. Then, after a messy encounter with their father, they go missing.
You never expected to see them emerge from mount ebott with a whole new race of people. With monsters.
Once again, you’d do anything for Frisk, even if that meant abandoning your apartment and living with monsters. But hey, maybe it’d be good for you to make new friends, form new relationships. It had been awhile.
And you find a certain skeleton very funny.
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finally coming back to writing after a while, ill update as much as I can, feel free to comment any suggestions or correct me on anything!!!
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"TommyInnit Has a Bad Time (Video Blogging RPF)"... bad time, you say? by InsignificantArtist
Fandoms: Video Blogging RPF, Undertale (Video Game)
21 Jul 2025
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Summary
TommyInnit Has a Bad Time, as the tag and title suggests. (Ft. Sans Undertale)
Series
- Part 4 of cross-fandom crossovers
- Language:
- English
- Words:
- 1,146
- Chapters:
- 1/1
- Kudos:
- 4
- Hits:
- 33
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Summary
Sans stared at him. Didn’t blink.
“You sure?” he asked, voice low. “’cause you’ve been pretty good at pretending you care about your test subjects when it gets you results.”
The room went colder.
Gaster’s expression didn’t change. But his hands were shaking — just slightly, almost imperceptibly.
Series
- Part 3 of mercyplates
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(Hiatus!) Patiencetale || A vision gone wrong. by solemn_solace
Fandoms: Undertale (Video Game)
09 Feb 2025
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Summary
Patiencetale is my Undertale, taking inspiration from both aus of Dusttale and Outertale. Still stuck underground, the monsters suddenly get gifted with finding books about the great outer space in the Waterfall trash dump. The books immediately fall into royal scientist, Dr.Gaster's hands for him to study and dissect before releasing them to general monster public. The monsters, thrilled to learn about such beautiful sights above the surface, begin creating any form of media they can around anything space related. The underground made what is seemingly a follow around the stars, looking to Gaster for knowledge about the things they now based their lives off of. Crystals in the ceilings of Waterfall and Hotland quickly were made into jewelry pieces. No one could walk an inch in the underground without seeing stars, artificial ones.
This au follows Sans, Dr.Gaster's son. A boy who is deemed so ill and fragile he is too be watched and not touched by a single soul, but his father of course. Gaster dreams of seeing the stars one day, after breaking the barrier, and he will do everything in his power to do so. Whether that means exploiting his son for pity, or stealing human souls to extract magic from.
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Meet the skeleton brothers from the multiverse by DKperson
Fandoms: Undertale (Video Game)
15 Jan 2025
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Summary
An unknown time ago, a human was reincarnated as Sans in the Au he created. He managed to adapt well and survive with his Papyrus in the 'hell' he created. Things were slowly settling down…
Until fate decided to send this Sans and Papyrus to an Undertale multiverse with other versions of themselves.
Meeting skeleton brothers from another multiverse and what kind of chaos will they cause?
Time will answer everything...
.
.
.
Series
- Part 1 of Astraytale
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"Wow, you guys get along so well! I wish I had a sibling!"
"It's so cute that you two live together! It must be that brotherly bond, right? Still going strong?"
"You get along so well! You're so kind and considerate towards each other, surely there must be nothing but love in your household!"
Yeah... Right...
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- Part 11 of Skeletwins Side Stories
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Temporal Fenestra by aenor_llelo, Alderous, ConcoctionsFromHell, CryptkeeperKain, izziel_galaxy, Jaybird314, translunaryAnimus
Fandoms: Undertale (Video Game)
16 Nov 2024
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Temporal
1. relating to worldly as opposed to spiritual affairs; secular.
2. relating to time.
3. of or situated in the temples of the head.Fenestra
1. a small natural hole or opening, especially in a bone.
2. an artificial opening.Temporal Fenestra
1. openings in the temporal region of the skull of some amniotes, behind the orbit (eye socket).
2. artificial time windows.By complete accident, Sans discovers he's in a time loop. Entirely on purpose, he tells some guy named Papyrus. Despite himself, Papyrus wakes up every morning to meet a stranger named Sans for the first time.
Series
- Part 1 of Echtratale
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Summary
You overhear Undyne's true feelings about your fate in the royal guard, and the confrontation goes terribly wrong
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The Mother Of Dragons「 Sans & Papyrus Au's x Reader 」 by GoneToSleep
Fandoms: Undertale (Video Game)
14 May 2024
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❝ Long Ago, There Lived Monsters, Humans, Mages, and Dragons. All living in peace, till the human's decided Monsters, and dragons weren't meant to thrive in peace, causing war. Most mages going corrupted and fighting alongside the humans, monsters losing while dragons were known to be wiped away by mages, they are to be mythed of still living in the dark shadows of Ebbott's forest where monsters were sealed in the mountain, neither were seen again. Mages were casted out by humans, most killed by humanity. ❞
You've heard this tale many times, you chuckled as your eyes glowed up at the four dragons that bestowed you as their mother, other dragons visiting you sometimes. A mother of dragons. That was the title you were given, and you accepted it with great gratitude, caring for these mythical creatures that were known as beasts, even if they were tens of times larger than you.
But. When monsters were re-founded to the surface. It caused problems for you and your giant family. Especially the skeleton cousins living in that large mansion in the woods. Who knew you would create a larger family and disaster with them around. | The Mother Of Dragons「 Sans & Papyrus Au's x Mage Reader 」
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a little blue journal (should you be reading this?) by RattlesIsHere
Fandoms: Undertale (Video Game)
12 Apr 2024
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Summary
Sans has been in a mental (and physical) funk, so his doctor told him to start keeping a daily journal.
All the emotional moments... every day.
..even the ones he doesn't wanna talk about.
........
But, maybe he won't talk about it after all. -
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"Monsters could never artificially create their own kind. Science is not life, life is not science. The process of giving birth to offspring is only purely possible from love and the natural process of magic merging the energy of two monsters' souls. From love and magic, various hybrids can be born, giving rise to new and unknown species in the dungeon. The power of such monsters is amazing, combining several types of magic in themselves. This is how the core of a child, just born in the mother's body, will remain directly connected to its soul until the moment of birth. The young soul, which is just beginning to form, will immediately turn into a pile of dust if the procedure of separation from the mother is carried out too early. Losing its child, the monster loses a part of its own soul. Children are..."
The Unknown closed the book without even finishing the page. The process of creating their species was too complicated. Where was the research? The facts? Not just words written down by unknown Chudovskians. Is science not life? If there had been no science, the monsters would have died after the war, destitute under the mountain. Hungry, cold, in the eternal darkness of a new life. -
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" Монстри ніколи не могли штучно створити собі подібних. Наука - це не життя, життя - не наука. Процес народження потомства є лише суто можливим від любові та природнього процесу магії злиття енергії двох душ монстрів. Від кохання і магії можуть народжуватися різні гібриди, породжуючи нові та не відомі види підземеллю. Сила таких чудовиськ вражає, поєднуючи декілька видів магії в собі. Саме таким чином, ядро дитини, щойно зароджене в материнському тілі, до моменту народження залишатиметься пов'язаним на пряму саме з її душею. Молода душа, яка тільки починає формуватися, одразу ж перетвориться на купу пилу, якщо провести процедуру відокремлення від матері занадто рано. Втрачаючи своє дитя, монстр втрачає частину власної душі. Не надто велику, щоб померти, але й не надто малу, щоб не залишити маленьких тріщин у душі почвари. Діти це.."
Невідомий закрив книгу, навіть не дочитавши сторінку. Процес створення їхнього виду був надто складним. Де були дослідження? Факти? Не просто слова, записані незнаними чудовськами. Наука не життя? Не було б науки, монстри загинули б ще після війни, знедолені під горою. В голоді, холоді у вічній темряві нового життя. -
THE GREAT PAPYRUS' JOURNAL (no boys or girls allowed) by zaru
Fandoms: Undertale (Video Game)
10 Mar 2024
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Papyrus has not been having the best of times. What better to do other than write all your feelings out in a journal every single day? Surely nothing would go wrong here.
He was certain.
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After their handplates have been removed, Gaster, Sans and Papyrus are ever closer to fresh, new beginnings as they move into Snowdin. Leaving their past behind, they are ready to start a new chapter in their life... but everything may not be as simple as it seems.
Series
- Part 3 of Handplates Determination
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Idly my bones lay by (an Undertale AU Fanfic) by AfterArtist
Fandoms: Undertale (Video Game)
15 Mar 2023
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Overpopulation has been robbing the Underground of resources and bleeding their farms dry, with only six human souls the king worries they won’t be able to escape the underground before it’s too late.
Charging the Royal Scientist with creating an artificial Human soul before their timer runs out.
However creating a Human from nothing in near impossible, the soul needing a vessel to grow and exist in. Luckily, Dr. Gaster has two subjects from previous attempts that could aid under such circumstances.2LDR:
Gaster is horrible and Sans, Papyrus and Undyne suffer for it
Please read the tags and TW’s before each chapter and be aware this is heavily influenced by the comic HandPlates -
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Summary
Gaster marvels over his two sleeping newborn sons, Sans and Papyrus, reflecting about becoming a father and processing all the emotions filling his Soul.
Series
- Part 8 of Fate Drift
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Gender-Switching Scapulas (Sans TG Story) by ComicalFont
Fandoms: Undertale (Video Game)
27 Jan 2023
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When Dr. Alphys has a new solution she's created at her lab on the surface to help trans people outwardly change their gender for a day, her friends, Sans and Papyrus, are delighted to come see her work and congratulate her on it. Surely, once it's released to the public, it'll help people all over the world feel like how they're truly meant to be seen! What neither her or the skeletons could expect, however, was that the sandwich she'd managed to infuse the medicine into for her lab tests looked strikingly close to the one Sans had brought along with him for lunch, and after the two get mixed up, Sans has the, well, unexpected experience of being a woman for a day, *sans* the effort.