1 - 20 of 86 Works in Undyne (Undertale) Swears
Navigation
Listing Works
-
Tags
Summary
Toriel teaches Papyrus and Undyne to cook properly, to varying results.
Toby mentioned his awesome fanfic idea on the Undertale 10th Anniversary stream, so I decided to cook something quickly. Enjoy!
-
Someone Really Cares About You. by Meowzerz_Oh_6
Fandoms: Undertale (Video Game), Deltarune (Video Game)
17 Sep 2025
Tags
Summary
Sans Undertale struggles to adapt and move on while integrating on the surface.
The troubles of his past haunt him, the burden of his old home, coming from a different world, being aware of resets, the trauma is all messing with his head.
He’s already fallen into depression and other darker thoughts.
Will he succumb into hopelessness, or will he realize that people care about him in time?
OR
What if Sans Undertale is actually from Deltarune? What will a man with such knowledge and burdens do? Will he stay determined? Or will he succumb into the despair that the universe threw one thing after another at him, as he tries to move on in a permanent happy ending.
-
Tags
Summary
During Genocide Route, Frisk spares Undyne and runs away. Undyne doesn't follow them, instead uses her last powers to reach Alphys' Lab in Hotland.
Feelings get revealed, and other very intense emotions and wants reveal themselves
-
Tags
Summary
Mobtale AU. Since the sudden deaths of her husband and son, Toriel has never been the same. What once was a kindhearted Queen turned into a leader that rules with an iron fist. Distant and changed, Sans worries for his friend. What started as a simple joke lands little orphan Frisk with a troubled past at her doorstep. Being able to love again starts to become a possibility for Toriel.
However, there is always something in the shadows and it will take pure grit and determination to stop it. -
A field left untended - not dead, just resting by SpooksterNuui
Fandoms: Undertale (Video Game)
26 Jul 2025
Tags
Summary
Undyne has given up. There is no point fighting a battle that was never one to begin with. All is pointless, everyone she has known is dead. Leaning against the ruins, she slumps down with somebody else's journals tumbling onto the ground next to her.
- Language:
- English
- Words:
- 1,447
- Chapters:
- 1/?
- Kudos:
- 6
- Hits:
- 30
-
Crash out tale (a joke au) by im4gi_nati0n_fact0ry, Ufpapyruscafe, Wimidicus
Fandoms: Undertale (Video Game)
24 Jun 2025
Tags
Summary
What if someone turned out to have more determination then frisk?
Frisk, after killing again, and again, lost determination, losing resets. Sans took advantage of that and killed frisk, but frisk managed to reset before dying, but then...why did 2 need humans fall down?
Series
- Part 1 of Every universe there's us
-
Tags
Summary
Hush now, little one. I have a story to tell. A story about humans and monsters.
Frisk Estrella lived on the surface, and was just one face in the crowd of thousands within the large city. Buckling under the pressure on his home life and internal forces preying at his mind, the last think Frisk wanted was to end up being on the run from the cops. Unfortunately, some don't get a happy life.
After a confrontation leads the boy wanted for murder, Frisk ends up in the bottom of Mount Ebott, where he discovers a civilization of mongers just below his feet. To anyone, they would be horrified, and would try and venture through to leave.Frisk however, finds himself growing familiar with this place of monsters, and soon enough, thinks about staying. But as he makes friends and allies, hundreds of years of history begin to rear their heads as Frisk must confront enemies that could threaten not just the Underground, or humanity, but the very nature of existence as well.
In order to save his friends, and himself, Frisk must have DETERMINATION to survive.
-
Tags
Summary
A sitcom inspired plot where everyone lives in the same apartment! Wacky adventures ensue, kitchens get burned, and maybe someone dies (well, I guess you saw the tags.)
This is made to start fun and chaotic and slowly get darker. Chapters labeled with * are special in some way.
CHAPTER GUIDE
[SEASON ONE]
Three Kids, Two Keys, One Room (5/21/25)
Welcome Wagon Warfare (5/21/25)
Closet Politics (5/22/25)
Fridge of Theseus (5/26/25)
The Kid With A Thousand Hobbies (5/27/25)
Circuit Glitches (5/29/25)
The Great Laundry Heist (TBA)
* The Bugged Mirror (TBA)
[SEASON TWO]
Heavy Metal, Lo-Fi Ghost (TBA)
* Stranger Things Have Happened (TBA)
Dad Weekend (TBA)
* The Lost and The Found (Mostly Lost) (TBA) -
The Void's Waltz - Dancetale W.D. Gaster x Reader by LilouLaments
Fandoms: Undertale (Video Game)
25 Apr 2025
Tags
Summary
DISCONTINUED!!!!
Being turned into an interactive fiction on itch.io under the same name.Everyone's heard the legends surrounding Mount Ebott.
If you go to the chasm on top of the mountain, make a wish, and throw in a seed from your favorite flower, it will come true once the flower blooms down below.
You reached out your hand, the seed clutched tightly within.
You hold your hand out above the chasm, standing much too close to the edge.
As you let of it, so did the earth beneath you, and
down
you
went.⚐︎☼︎ 💣︎⚐︎☼︎☜︎ ✌︎👍︎👍︎🕆︎☼︎✌︎❄︎☜︎☹︎✡︎📬︎📬︎📬︎
You're a dancer, your SOULmate is Wing Dingbat Gaster—AKA Bats—and you fall into the Underground to end up finding him.
WARNING, he doesn't come up for the first couple chapters!!!! -
Tags
Summary
"why do you smoke anyway?"
"I don't really know how to answer that."
||
„I'm fading away..."
|||
In which a broken skeleton meets a broken human and they both deal with depression, RESETS, and unwanted pasts.
They learn to deal with their confusing and complicated feeling with each other, along with remembering things they shouldn't.
For Ace, smoking is the only way out.
Smoke and ignore the world.
As long as he has his smokes and his new skeletal companion, he seems to do just fine.
Series
- Part 1 of Blue Smoke
-
Tags
Summary
After Frisk and Kid manage to break the Barrier and free the monsters from the Underground, the humans and monsters of Ebott must learn to get along.
Heheheheheh, good luck with that...
Series
- Part 2 of United SOULs
-
Tags
Summary
In Waterfall, in the Neutral and Pacifist runs(more common in Pacifist), most players will rush to help Monster Kid when they trip while on the bridge. But, what would happen if Frisk rushed to help them, but wasn't in time?
This is one possible outcome.
Series
- Part 1 of United SOULs
-
Tags
Summary
Having been born and raised in Ebott city, you’ve developed a passion for ocean-related things. Graduating from Ebott College for marine biology you love being near the ocean and helping out.
However, you haven’t gotten a chance to be hired for bigger jobs as you’ve settled for working at Ebott Aquarium, the 3rd largest Aquarium in America. You love your job and having worked at the aquarium for 2 years now, 3 including the internship, you're very vocal about saving animals especially sea animals dealing with pollution.So what happens if a water-loving person meets the monsters living in Mt. Ebott for centuries and what’ll happen when she meets a fire monster who loves the passion she has in her words and actions?
And what happens when she meets a skeleton monster who also loves how she voices her opinions?
I have no clue if this will have two love interests but I'll try! If not then I'll update this!
-
A Watery Grave (With No Ladder to Save You) by PietroFan420
Fandoms: Undertale (Video Game), The Sims (Video Games)
14 Dec 2024
Tags
Summary
Undyne enlists Papyrus to help her with a really weird videogame that she and Alphys were trying out.
Unfortunately for the two of them, Papyrus is incredibly evil.
-
The Near and the Dear Ones, the Old and the Young by WrittenNovelty
Fandoms: Undertale (Video Game)
10 Dec 2024
Tags
Summary
Day 9: Found Family
An old turtle monster with graying hair settled onto the ground by a low table. He’d pushed the cushioned seats off to the side, finding comfort in the familiar hard stone. He reached forward to grab his teacup, still warm, and breathed a small sigh of relief at the serene silence. The only sound was his breathing and the peaceful waterfalls outside his home.
Thunk, thunk, thunk.
Ah, never mind then.
He smiled wide as he sipped tea and closed his good eye. His home’s door was slammed open, the force knocking much of his cluttered items down. He didn’t bother to see who it was. He already knew.
“Gerson!” She called.
He peeled his eye open and lowered the tea.
He laughed, “Hello, sea urchin!”
. . .
She remained in the open door, pointing at him with a familiar fire in her eyes.
She demanded, “Have you ever heard of Gyftmas?!”Series
- Part 9 of Gyftmas 2024/2025 Advent+
-
Tags
Summary
Undyne is screwed when Gaster possess Sans and Papyrus. You don't get anymore context than that.
- Language:
- English
- Words:
- 340
- Chapters:
- 1/?
- Kudos:
- 7
- Hits:
- 85
-
Tags
Summary
"Fuck, Sans... If you had killed this human the day you found her, we wouldn't be here..." Undyne whispered to him, filled with remorse and guilt.
She passed his hands behind his back, anti-magic handcuffs surrounding them. Checking their placing, she locked them.
Sans could not tell if she was hating him. Perhaps she was blaming herself, too. Perhaps everyone was feeling a little responsible. At least, he hoped so."Why did you do that?" she sighed, rhetorically.
"I did it out of love." Sans simply replied.
"That’s the stupidest excuse you could have chosen..."
•| ⊱❦⊰ |•
Corrupted by the Lust, monsters live a hell everyday, sex and immorality being a daily routine.
Sans is one of the most luxurious of them and then, the one who had always been the most disgusted by all of that. He lost hope. He lost will.One day, while going to this giant purple door, he found a package. A human baby. And strangely, Sans felt... at peace.
Now, Sans has something to protect from this world. And he is not going to give up, even when everyone seems to be against him. But it might be easier than he thought: it seems that this little girl can change hearts...
-
Tags
Summary
You overhear Undyne's true feelings about your fate in the royal guard, and the confrontation goes terribly wrong
-
Tags
Summary
Perhaps Sans should have considered whether there was something more to "Frisk" than meets the eye. Maybe he should have inquired about the reasons behind their countless Genocide Runs. Then perhaps he would have been much more prepared.
(In short, Player is canon and decided to use a mod that gives them the ability to use “Sans” as their main character)
-
Tags
Summary
sans and papyrus go to school :p