1 - 20 of 277 Works in Alternate Universe - Undertail (Undertale)
Navigation
Listing Works
-
Undertale/Undertail:Love and Loss by FazclairesMusicMaamSimp888
Fandoms: Undertale (Video Game), Undertail - Fandom
12 Dec 2025
Tags
Summary
Another human falls, another fool to bite the dust. To survive in a world tainted by the actions of his kind, for better or for worse. Luckily for him this seems to be one of the more fun worlds.~ Friends, foes, and every other situationship inbetween are bound to be found.
-
Tags
Summary
Your name is unimportant. Your job is nonexistent, really. And your (ex)roommate just kicked you out in the middle of a surprisingly cold November night. But whatever. You don't care. You'll be fine.
Keep telling yourself that as you freeze to death, idiot.
But you'll be fine, for one reason! Two, actually. Two people - monsters really - who just so happen to have the same names as some fonts you know of? You stay with them instead, just to get back on your feet, and a single question rises to your mind.
What the hell is keeping you here?
(Explicit chapters marked with ***. Explicit chapter count: 2)
Book One: The Answer (Chapters 1 to 60)
Book Two: The Question (Chapters 61 to Present)Series
- Part 1 of The Sans x Reader Trilogy and Extras
-
Tags
Summary
Velva never had any contact with any other skeletons until she met Sans and Papyrus, who seem a bit more knowledgeable about their species. In an effort to learn more about themselves, Velva decided to experiment with sans.
...
This is a story where you, yes, YOU, the reader, get to decide what these two characters do.
Just by commenting your favorite kink, position, or prompt on this Fic, excluding anything that falls under Age play or something that may be
considered a felony!This collection will feature mini-comics ranging from 1 to 10 pages (depending on my motivation) once a month.
-
Tastes like Honey - Underswap Papyrus x Reader by Jellyyy_05
Fandoms: Undertale (Video Game), Underswap AU - Fandom
26 May 2025
Tags
Summary
You're the type of girl that things never seem to work out for. That is until you run into mysterious skeleton with rugged good looks and surprising charm. Maybe things are starting to look up for you. This is a reader-insert. Reader is female. This Fanfiction contains skippable smut. This is my first Fanfiction so any feedback is appreciated. Happy Reading! ~ J
-
Tags
Summary
A series of SFW + NSFW drabbles/oneshots relating to the Bad Sans Gang being gay and in love with each other.
THIS CONTAINS MATURE ADULT CONTENT
-
Tags
Summary
Wake up, go to work, head home, go to sleep, rinse and repeat. That's how he did it, that's how it always worked out for him. Working paid the bills, and bills always kept his hands busy.
...But one day, that all changed, when death came for him, not by a skeleton in a robe, not by dying of old age, but by simply taking a bullet to the face, wrong place-wrong time.
Yet death didn't keep him down...
-
Collect all works by Heartbreaker2022
Fandoms: Sanders Sides (Web Series), Undertale (Video Game)
22 Mar 2025
Tags
Summary
This was a one shot book that I am moving over from Wattpad. As I no longer am on that platform very often I’m moving my work to AO3 so I can permanently move off of Wattpad.
- Language:
- English
- Words:
- 1,873
- Chapters:
- 5/5
- Hits:
- 35
-
Killer's mouth being put to good use...for once. by asheiskindafunny
Fandoms: Undertale (Video Game)
10 Mar 2025
Tags
Summary
Dust never thought he'd say this, but Killer is REALLY fucking good with his mouth....when he's not running it and annoying the shit out of him, that is.
-
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
Cross is not okay.
-
Tags
Summary
Sans and reader are having gooooddddd tiiimmeee!
-
Tags
Series
- Part 1 of Doctor, Doctor!
- Language:
- English
- Words:
- 1,530
- Chapters:
- 1/1
- Kudos:
- 3
- Hits:
- 123
-
Tags
Series
- Part 3 of Vampire Gaster
- Language:
- English
- Words:
- 1,420
- Chapters:
- 1/1
- Hits:
- 62
-
Tags
Series
- Part 2 of Vampire Gaster
- Language:
- English
- Words:
- 1,309
- Chapters:
- 1/1
- Hits:
- 36
-
Tags
Series
- Part 1 of Vampire Gaster
- Language:
- English
- Words:
- 1,283
- Chapters:
- 1/1
- Hits:
- 38
-
Tags
-
Tags
Summary
cum drinking = pregnancy
-
Tags
Summary
Cross is the new recruit. He doesn’t talk, he’s not social, he seems cold. Chia felt like he didn’t like her at all but interesting events happen
-
Under Dreaming by Cerys_Delaney for thelovelyskelesisters
Fandoms: Undertale (Video Game)
14 Nov 2023
Tags
Summary
Dr. Gaster is searching for souls through dreams, but he finds one whose sexuality brings out the kink in every creature of the underworld.
No one seems safe from this girl's perseverance to be able to take just about anything. And it's driving Gaster wild with curiosity... and desire.
*Warning: plot is adorned with a shameless amount of sex.
*Tags updated as new kinks, pairs, and experiments are explored.
*Chapter Titles updated with pairings for those who want to skip past the plot and read specific pairings. I aim to please. Leave me a comment if I succeed ;-) -
Indolent Inclinations by CloudyintheCloset for dustsanses
Fandoms: Undertale (Video Game)
07 Oct 2023
Tags
Summary
Dust forces Cross to take a nap, Cross thanks him.
For @dustingrayves.
Dust/Cross with rough romantic fuck, praise, marking/biting, rimming, and anal.Check out my Twitter for more writing info!