1 - 20 of 9,496 Works in Sans/Sans (Undertale)
Navigation
Listing Works
-
Tags
Summary
The RougeRiddler's been named! Also there's a weird hole in the sky again! Finally several new enemies have reared their heads!
Warning: This Fanfic is not accurate to Undertale canon as the authors didn’t play Undertale when this was written and were 12. This is Book 8 of 9! This is the last complete book in the series! The next book consists of one complete chapter and one uncomplete.
Series
-
Tags
Summary
While Ink is out for the night in Cross's house, Dream decided to head into his home to see Error to form a secret affair with him that their partners won't have to know about. Or will they? Along with that, Dream makes sure Error is ok with certain stuff going on and stopping if he needs him to.
Series
- Part 1 of Kick The Bucket
- Language:
- English
- Words:
- 1,863
- Chapters:
- 1/1
- Hits:
- 17
-
Tags
Summary
After escaping Nightmare and a tortuously long trial, Killer, Murder, and Horror were released into normal society with no job, connection, or people in this new world. It's okay; as long as they have each other, anything is surmountable, even shitty low-paying jobs or awful roommates.
As long as they have each other, everything will be okay.
-
Tags
Summary
!!!This story contains 18+ content!!!
Red wakes up in an AU that's not his own. After being taken in by Sans, his adventure begins. Drama, violence, silly insults, actual serious moments, romance, and more!
I don't know what tags to use, so tag suggestions are welcome! -
Tags
Summary
A bittybones breeding facility that specializes in parthenogenesis. It takes bitties otherwise lined up for being put down, and receives one of the rarer kinds... it's a nightmare
the focus in here is on big bellies. do not expect real classical sex from this. they do not have genitalia.
Series
- Part 1 of Undertale Puffs
-
Tags
Summary
In this toxic enemies to lovers, Nightmare and his gang keep causing trouble around the Multiverse, and when Dream goes to investigate, he's raped by Killer. Following that, Dream discovers he's pregnant and Killer runs away from Nightmare's castle to be with Dream, reevaluating his life.
Long story short, evil toxic relationship, mpreg, Dream and Killer fall in love, mpreg again, kidnapping happens (multiple times), marriage happens, and children are born. That and a lot of drama and a lot of sex.
Unlikely Lovers updates every other Sunday of the month
*Please read author notes!! Fr tho, please
-
不渡 - DS梦兄弟亲情向 by Blank_T137
Fandoms: Undertale, Undertaleau - Fandom, dreamswap - Fandom
15 Jun 2026
Tags
- Language:
- 中文-普通话 國語
- Words:
- 1,171
- Chapters:
- 1/1
- Hits:
- 13
-
Tags
Summary
Nightmare takes a break from work with his bitty
-
Tags
Summary
Edge and Red go to pick up Papyrus and Sans to stay with them while Grillby is on vacation.
Series
- Part 5 of Sanses are good bois AU
-
Tags
Summary
Days at work were all the same for Reaper: go to a given place, reap the souls, and leave. It wasn't supposed to go a different way, he wasn't supposed to meet a child in the middle of a dead universe, and he definitely wasn't supposed to take him home with him.
But what else could he do ? This kid needed him, he couldn't leave him behind.
-
Tags
Summary
Nightmare knew he was not the best in the Multiverse.
Hell, he was not even good.
He was the God of Negativity, a title that followed him like a curse carved into his very bones, and it made perfect sense that someone like him would end up completely alone.
Or: Nightmare is lonely so he ends up recruiting Killer, Dust and Horror all based on misunderstandings.
With fanart!
Series
- Part 3 of Undertale AU's
-
Tags
Summary
It’s in the title! Also feel free to make suggestions!
-
Tags
Summary
Being a creator themselves they hated the way that XGaster treated his creations but their wasn’t much they could do about it seeing as it wasn’t exactly real, but reincarnating into UnderVerse they were going to use this opportunity to beat some sense back into Ink, and make sure XGaster lost his life privileges and XGaster’s bitchass was going to pay, and his victims would get JUSTICE. But what was JUSTICE? And what was VENGEANCE? Could they make sure not to fall into VENGEANCE or would they even care if they did?
Also if they might be able to help out a pair of lovers along the way and see one of their favorite ships come to fruition, well, no one could blame them~
But can the others at least stop calling them kid!
-
Tags
Summary
After a brutal conflict, tensions rise as Dream and his allies struggle to figure out how to stop an enemy who seems nearly impossible to defeat. Back at his hideout, the pressure of the situation begins to take a toll, and difficult decisions start to feel unavoidable.
Later, alone in the quiet of the night, Dream is forced to face his own doubts and fears. When an unexpected visitor arrives, the conversation that follows pushes him even closer to a choice he may not be ready to make.
-
Tags
Summary
Nightmare is a smoker. Dream tries to help him in his own way.
Series
- Part 35 of swapdream MENTION 🤨⁉️
-
:-:DSC!Drinkmare(?):-: No Way Out [Gore] by Anonymous
Fandoms: Undertale, dreamswap - Fandom, DreamSwap!Cannibalism AU
14 Jun 2026
Tags
Series
- Part 7 of Dreamswap!Cannibalism AU series
- Part 5 of AnonymousA's Dreamswap!Cannibalism AU series
-
A Beginning of Something New by kittyKnockerz
Fandoms: Sans AUs - Fandom, Undertale Multiverse - Fandom, Undertale (Video Game)
14 Jun 2026
Tags
Summary
Killer sans lives a life of sex trafficking. He'd never seen the outside world, he'd never known anything but within those walls. Yet, something new happened..
A new person came, but this time he wasn't afraid. As long as he got to see the stars of the sky, he could die in peace.But, that was only the beginning of his story. A story of a beginning of something new
-
Tags
Summary
I just hate (love) your stupid face.
(Spicyhoney enemies to lovers with a dash of sickfic thrown in)
-
Tags
Summary
capture the stars; tell them you won them.
Or;
Error finds a fuel to a fire he could never start; something to grasp and keep close—a replacement.
It’s not taking it that makes the situation difficult, though.
It’s keeping it.
Series
- Language:
- English
- Words:
- 3,138
- Chapters:
- 2/5
- Hits:
- 37
-
For You I Do Anything (Cross X Dream aka Cream) by Puppy_Chat
Fandoms: Undertale (Video Game), UTMV
13 Jun 2026
Tags
Summary
How Cross and Dream started before becoming a couple
Series
- Part 3 of Our Little Loves, For Good or For Bad