1 - 20 of 41,211 Works in Sans (Undertale)
Navigation
Listing Works
-
Tags
Summary
10. "Well why don't you just kill me?"
...
Fell sans fell sans fell sans angst ahahahahahahahahahahahahahhaugh. Hm. I mean what. Fell sans and frisk but he's lowkey suicidal.Series
- Part 10 of Melting_Alliums' Whumptober 2025
-
Tags
Summary
I ran out of tag room, so it’s being split up! Hope you enjoy nonetheless!
Series
- Part 2 of Cactus’ Kinktober 2025
-
Tags
Summary
Nightmare can't hide it anymore... Killer remembers their first kiss and the next big step is on the way
Series
- Part 2 of Our Little Loves, For Good or For Bad
- Language:
- English
- Words:
- 3,229
- Chapters:
- 1/?
- Kudos:
- 4
- Hits:
- 15
-
Tags
Summary
Sans, in accumulated rage from all the tests, pushes Gaster off a platform in the core. Rather than in the original Handplates, Gaster falls onto another platform, dying almost instantly. Betrayal between brothers, angst, sadness, and possibly a crack in a seemingly unbreakable bond to follow. (If I finish this) the brothers will begin to learn about their mysterious captor and who he was, after he was gone.
This work has gotten many good beta read critiques, and may someday be finished. -
Tags
Summary
Frisk and Leo (the Bravery SOUL human) have been friends forever, since they were babies. Now, the two 10-year-old children are drunk, chubby and currently at the bottom of a mountain in an underground civilization of monsters...but a True Reset says that this will be a first for both of them, so it's up to two drunk kids to guide themselves back home - without dying, that is.
(DISCLAIMER: DUE TO LACK OF INFORMATION ON THE OTHER FALLEN HUMANS, MOST STUFF LISTED HERE ABOUT THE BRAVERY SOUL HUMAN, WHO I'M CALLING LEO, WILL BE MY PERSONAL INTERPRETATION. DO NOT TAKE ANYTHING LISTED HERE AS FACTUAL INFORMATION ON THE BRAVERY SOUL HUMAN).
CW: Drunk Children, Fantasy Violence, Partial Nudity (not shown or described), Minor Weight Gain Elements.
Series
- Part 1 of Undertale: Partners AU
-
Tags
Summary
IT'S THAT TIME OF THE YEAR!
Kinktober time~!So yeh this is basically short drabbles of smut. Some will be longer, some will be shorter but I'm gonna try my best to make them juicy~
--------------------------------------------------------------------------------
-
UDY on the Surface by CommanderBullet
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
25 Oct 2025
Tags
Summary
It's been a few years since Monsters returned to the Surface and lots of things have changed... Accompany your favorite characters from Undertale, Undertale Yellow and Deltarune as they try to manage their everyday responsibilities and go through a few wacky adventures while at it in this slice-of-life crossover AU.
-
Another Ending by Zekyn
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
25 Oct 2025
Tags
Summary
What if one pivotal moment had gone differently? Chara and Asriel find themselves facing the aftermath of choices that could have ended them both.
- Language:
- English
- Words:
- 9,322
- Chapters:
- 1/1
- Hits:
- 12
-
Tags
Summary
Ink has never been a good sleeper. He rolls around and sneaks out of bed and is constantly staring into space with wide eyelights, all while he should be sleeping like a normal monster. So, Error, being the good boyfriend he is, takes him to Sci to get meds. Little does he know, Ink is about to screw everything up and put him through the consequences.
-
Tags
Summary
Dream, un prince de quinze ans.
Killer, un tueur de quinze ans.
Un amour dit interdit.! warning! âmes sensible s'abstenir, se ne sera pas un happy ending.
_______
Écrit pour le concours de AmiraAmie0 (wattpad)- Language:
- Français
- Words:
- 3,545
- Chapters:
- 4/4
- Hits:
- 23
-
The Darkness of Creation: Can't Be Erased by Mysterie
Fandoms: Undertale, Disney - Fandom, Marvel, Teenage Mutant Ninja Turtles, Cuphead - Fandom, Dick Tracy - Fandom, Halloween (Movies), The Legend of Spyro (Video Games 2006-2009), Spyro the Dragon (Video Games 1998-2005), Pokemon - Fandom, Deltarune, Bendy and the Ink Machine
25 Oct 2025
Tags
Summary
Halloween gives rise to something the whole of Earth is not ready to face...
-
Tags
Summary
In the timeline with the happiest possible ending, the heroes of the Delta Rune get to live the rest of their lives in peace and harmony!
Or at least they would if they, and the rest of Hometown, weren’t a load of weirdos. These are just some episodes in the irregular and sometimes stupid lives of the heroes of prophecy and their families! -
Tags
Summary
The thing about soulmates is, no matter what pries them apart, they always...always find a way back together
Chapters 1-3: Prologue
Chapters 4+: Main Story
*This is a rewrite of I Have The Power of Gaster AND Anime On My Side. Same concept, with a bit of a serious feel.*
**Please be aware that this is not like my usual reader-inserts!! This story is in 3rd person pov, very vague description of a female reader. Unnamed (Pet names only). No use of y/n, y/e/c etc.**
-
Tags
Summary
So, I heard you like skeletons...
Reader insert prompt fills for @skeletonh0e's sans-centric Kinktober challenge on tumblr
-
Tags
Summary
Eh, this year Undertale has gained a bit of popularity again, thanks to Deltarune Chapter 3–4 and the 10th anniversary. So here’s my personal AU.
Series
- Part 1 of My au situation
- Language:
- English
- Words:
- 852
- Chapters:
- 1/1
- Hits:
- 10
-
Tags
Summary
Long ago, deep in the quiet woods of the Underground, Grillby sought only solitude. He never expected to find a fallen human woman-wounded, frightened, and far from home. Against his better judgment, he took her in. At first, it was duty that kept her hidden and safe from the Royal Guard. But when her laughter began to fill the spaces between his silences, protection became something deeper.
When word of her existence spread, Grillby made a dangerous choice: he marked her under his protection, binding her fate to his flame. Their bond grew-slowly, tenderly-but like the flowers she loved, her life bloomed briefly. And then it ended, leaving only memories and ash.
Centuries later, on the Surface, Grillby runs a quiet bar and tells himself he’s content. That is, until a new regular walks through the door - a woman with the same gentle voice, the same curious eyes. There’s something achingly familiar about her, like a dream half-remembered. His flame stirs, warmer than it’s been in ages.
But can love reignite across lifetimes? -
Tags
Summary
You had been playing an immersive VR game: The World Of Aspenheim. However, after 10 years, the servers were about to close and to give your last farewells, you decided to stay online until the servers kicked you out. In the end, you fell asleep on the golden throne...
Only to wake up still logged into the game!? And why couldn't you log out!? And who was the one knocking on the door!?
"YOUR HIGHNESS? ARE YOU AWAKE?"
-
Tags
Summary
You, the reader, in this case Bea, are obsessed with Undertale, and a short skeleton. But once the monsters break the barrier and publicity spreads of their arrival, it's suddenly pertinent to keep the monsters from ever finding out that their lives were a video game. You still play the game avidly, despite the unknown effects; however, when a certain pair of skeletons become your roommates, you discover pretty disturbing things about the game you're playing. However, will you keep playing the game under wraps in hopes Sans will never find out? Or will you be forced to give it up?
-
Tags
Summary
Sans has seen it all. Every reset, every route, every ending. The world keeps turning back on itself, and he's the only one who remembers. While others laugh, dream, and fight like it's the first time, he carries the burden of knowing it isn't the first time.
With each familiar face and every repeated moment, he begins to wonder if only this time would be different. His hope keeps growing and shrinking every time. Maybe the human chooses kindness. Maybe his brother's smile will stay safe. Or maybe it's just another game he's destined to lose. Still, he keeps going, for his brother, for the chance that maybe, just maybe, this path leades somewhere else.
-
Tags
Summary
Life is monotonous and dull, but it’s okay. You’re fine.
Assignment after assignment, test after test, meaningless conversation after meaningless conversation. It fills the void like a flitting firefly in the smoggy night sky, a brief flash of light— followed by an endless expanse of nothingness.
That’s okay. You’ve grown accustomed to it like a goldfish stuck in a glass bowl. You swim, back and forth, over and over and over again until you can’t anymore. It keeps you occupied, distracts you from your lonely, miserable existence.
Until you meet someone who simultaneously fills the void, and drags you so much deeper into it.
—————————————————————————-
Underfell Sans x ReaderA story about the woes of young adulthood. Includes themes of abusive relationships, inappropriate age gaps, mental illness, and substance abuse.
- Language:
- English
- Words:
- 11,051
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 33