1 - 20 of 222 Works in Alternate Universe - Mobtale (Undertale)
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Summary
What happens when everything changes? Everything is the same but it isn't.
An entity from the stars descends to earth and disguised themselves as human. They witness history in this new era of monsters and humans, while also dealing with the demons that dare dirty the earth with their presence.
What happens when you step into the battleground from one universe, only to win and come out into another parallel world, except you’re the protagonist?
You weren’t one for the spotlight. You loved your sister, even if she wasn’t one by blood. You only wished for her well-being and happiness. Except here… she’s gone. And now you have to take her place and stand under the limelight as you walked your path in her place - the protagonist.
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I DON’T CONDONE MY WORKS TO BE TRANSLATED, REPOSTED AND/OR FED TO AI.
9/1/25 — thank you for 600+ hits!
Series
- Part 2 of Still As Stone AU
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ArcaneFell: Under His Protection by Witch_of_Ragnarok
Fandoms: Undertale (Video Game), Mafiafell - Fandom, ArcaneFell
30 Aug 2025
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ArcaneFell is a Mafiafell fanfic set in the brutal, pre-industrial underworld of the 1860s. When Sheriff Marrow finds a wounded human slave in the snow, his quiet world of law and loyalty begins to fracture. He names her Garnet. She becomes his reason to question everything. Bound by silence and shaped by survival, their growing bond defies a world built on obedience and blood. As Garnet’s lost magic resurfaces, she becomes both weapon and witness to the dark games of Don Gaster. In ArcaneFell, protection is power—and love may be the deadliest risk of all.
Series
- Part 2 of ArcaneFell
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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. -
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When invertos, people turned into monsters by their own innate magic, come about, they're herded into a facility to await True Monsters to host them, so the they can better learn to understand their new magic. That was seven years ago, and now it's just me in the facility. I've got some visitors now, and I think they're monsters hosting me out. Will I finally get out of here or is it just a false hope?
Fluff galore. Hurt Reader. Overprotective skele bois. It’s gonna be a bumpy ride. Luckily though, MC has been wrapped in blankets and pillows and bubble wrap!!
Read the comments if you’re up to it! I try my best to respond to every single one and you can find hints to future chapters and plot lines in them!!
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Doin' It Right (ON-HOLD. Will resume on October 2025!) by vidrioborroso
Fandoms: Undertale (Video Game)
31 Jul 2025
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Summary
Monsters are free, and Frisk is safe and sound at home.
It feels like fairy tales are real, though a rough break-up after eight years of marriage quickly sobers that thinking.
With the break-up follows a proposal straight out of a steamy novel: share a room with a man you've just met, while you get back on your feet and work on the process of finding a new place to move into.
Turns out, the guy who smells like grease and beer from how often he visits Grillby's is a lot less romantic than you would think.
And it's precisely living together what gets you to know all the icky things about him.
Until you end up falling for him with each nice little thing he does, and suddenly...
It feels like all those icky things start to matter less and less.
More so, when things take a sharp turn and you're in the middle of a gang fight, helping him however you can despite not knowing what you're signing up for.
Overlooking details like bloody clothing, chipped teeth, and reports of missing people on the telly make seeing him drinking straight from the milk carton a much more tolerable offense.
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You spend your days reading and making deliveries for your carrier job, life is pretty normal. Weeeell, that's until you meet some well dressed skeleton brothers under..... uncomfortable circumstances. But that's alright! You'll work hard to make up for past mistakes. Relationships may grow although, someone might get a little "handsy" in the future. Welcome to my very first fan fic, but certainly not the last ;3
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You and your family are just enjoying a nice day at the park, when a life changing event happens that ruins everything.
You get taken away to a facility to be tested on...
Life doesn't feel as peaceful as it once did, you hated your new life.
"I wish I could just go into those story books I used to read..."
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Once known as one of the best scientists of the Royal Guard, Sans lives on logic and logic only.
He's rejected the idea of soulmates being real, too stubborn to picture it as something remotely plausible.
So, when he starts to gain glimpses of a thin red string tied to his only other human friend besides Frisk, Sans ignores that for an entire year.
Unable to accept his new reality, he drinks himself to near intoxication, and then his drunken self wanders into Grillby's, searching for the woman responsible for making him feel this way.
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Three High Ranking Members of the Mafia and a Serial Killer Walk Into a Bar... by Larry_your_waiter
Fandoms: Undertale (Video Game)
11 Jul 2025
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Sans has his own share of secrets, as the family will soon discover.
a series of non-chronological scenes in this AU of an AU because I can.
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After his fifth overtime shift in a row, Sans is as tired as he is tense.
Good thing he has a secretary to help him with that.
Series
- Part 2 of Smutty Sans/Reader One Shots
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ArcaneFell: Prologue by Witch_of_Ragnarok
Fandoms: Undertale (Video Game), Mafiafell - Fandom, ArcaneFell
24 May 2025
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Summary
The prologue is a short story that offers a first glimpse into the world of ArcaneFell.
Meet the Rookie—a young feline grunt trying to survive his first day in the mafia, working under the looming shadow of Don Gaster. Assigned to accompany Stonehand, a battle-hardened beetle monster with a long history in the black market, the Rookie is thrown into the depths of Dreamland City's criminal underworld.
Their mission: infiltrate the Golden Vault—the country's most notorious underground auction house—and secure a high-value item, no matter the cost.
But what begins as a simple assignment soon spirals into something much darker.
For the Rookie, this isn't just about bidding wars or underworld politics. It's a brutal lesson in what it truly means to serve the Family—where loyalty is a weapon, betrayal has a price, and one wrong move could get you buried beneath the marble.Series
- Part 1 of ArcaneFell
- Language:
- English
- Words:
- 3,037
- Chapters:
- 1/1
- Kudos:
- 1
- Hits:
- 17
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"Sooner Or Later You're Gonna Be Mine" As Seen On TV - Now With Added Ending! by And_So_The_World_Went_Quiet for All you LOVELY people!
Fandoms: Undertale (Video Game)
07 Apr 2025
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You heard right, folks! I've taken it upon myself to rewrite the INFAMOUS "Sooner Or Later You're Gonna Be Mine" Fanfic by Staringback!*
Come one, come all, to see An Ending of this miraculous Fan-Fiction! come for the ending, stay for the rewrite, as I intend to do my best to make it not only easy to recap, but with added content and editing that’s enjoyable for the whole family!
... or, at least most ages over 18!I WILL complete this fic, I'm still working on it, I just don't have a schedule anymore because I'm adjusting to a second job. Do not lose hope.
*please read the author's note in the first chapter and all applicable tags, thank you
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Bare Bones (Undertale Mafiatale/Mafiafell/Mobtale Sans and Reader Enemies to Lovers Romance) by aleppost
Fandoms: Undertale (Video Game)
26 Mar 2025
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After your mother (the last person that cared about you) passes away and you lose your job, you decide that you are going to move out of Ebott City to start a new life. On your last day in Ebbott City you make a wish into a fountain, and end up falling in. When you get out of the fountain however you find yourself face to face with a pair of skeleton brothers, and for some reason its now the 1930's???? It turns out that the Skeleton brothers are the head of the Mafia that runs your side of the city, and you now live in their district. Papyrus seems to be nice, Sans however is skeptical of you and your intentions and makes it known pretty quickly. Reader has to navigate living in a different time and figure out what their life will look like moving forward, and she wants these strange skeletons to be a part of it.
This is a slow-burn romance where Sans doesn't want to like you, but cannot seem to stay away. Enjoy!
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Set in the 1920's, this fic was heavily inspired by the Mob/Gangster AU's for Undertale.
Frisk and Chara live a struggling and complicated life on the city streets, having ran away from the orphanage just to survive. With Frisk being the optimistic younger friend, Chara is the brains of their dynamic duo as well as pessimistic, and willing to do whatever it takes to help them survive. The two manage to get by, but it’s on a fateful day that a promise is made, and suddenly the two are separated… by a mobster group known as the Underground, resulting in not just a fight to save their friendship, but a fight to save each other’s lives.
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no matter what form, no matter what world, and no matter how many times, you'll fall back into familiarity with him as he will you.
(or one shots i've written from ambitious ideas for multi-chaptered fics i've had, most if not all tooth-rotting fluff with a slice-of-life touch to it. almost. mayhaps. perhaps a little bit of hurt/comfort sprinkled in.)
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Companion fic to "Gilding a Song Thrush"
Sans is just as sneaky as his older brother, and just as weak to his hearts whims as his younger. It’s always been a sore spot of his, somehow being a combination of his brothers’ worst traits. Yet, he can’t complain too much when it benefits him.
In one back alley, behind some falling-apart dive, he heard it. Sans had never believed in the story of the Angel, but he’d be damned if he didn’t just hear one crooning.
Series
- Part 2 of Fog and Rain
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They call me the Antagonist, but I prefer Anti-hero by JustAnotherWriter21
Fandoms: Undertale (Video Game)
21 Feb 2025
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(Y/n) gets super concerned over the disappearance of her best friend, Ashlyn. Ashlyn had gone insane after she downloaded a shady game. (Y/n) is told by the game(?) to go to Ashlyn's apartment, revealing that Ashlyn has been sucked into the game. The sensible thing to do is look for outside intervention, but (Y/n) isn't known for her good decision-making skills.
The game "Beautiful Soul Redemption" is a dating sim where the hero romances many Skeletons. Sadly, (Y/n) is not the protagonist; she's the antagonist. That doesn't mean that she can't smooch skeletons if she wants to; it just means that every little thing will be TEN TIMES HARDER. But that won't stop (Y/n). Because if she stops, that means she dies in the real world too.
Yay, Ultimatums!
To escape, she has to redeem the souls already trapped in the game. The more souls she saves, the more her soul gets redeemed too. Her actions affect everyone, yet it feels like everything is out of her control. A conflicting feeling, isn't it?
Beautiful Soul player 1: the Redeeming Blossom
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Don Dew by sovlstrr
Fandoms: Mafiafell - Fandom, Undertale (Video Game), Mobfell - Fandom, Mobtale
16 Feb 2025
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Summary
Then he smiled, slow and easy, with an almost gentle expression. Letting his eyes crinkle with his hand moving to his pocket, the simple position focused on his hip.
"Sweet dreams, dollface.”
“Goodnight, Red.”
She smiled at him. To him.
A soft one, made along the curve of her lips... being enough to drive a lesser man insane.
The very sound of that coy voice reverberated in Sans mind. Desiring nothing more than to simply snag and grasp it tightly.Instead, he gave her a cocky grin, a familiar smirk that belied his whims. He took a final step back and with that he had sent his little lady off, taking his own departure soon as he had arrived.
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You have more than a few bad habits you can't seem to kick and all those bad habits seem to lead you straight to them. They don't seem to mind one bit though.
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You and Sans have spent the last five years toiling in the lab on your magnum opus: a looking glass into alternate timelines. But when you test it one late night in the lab, the impossible happens and you are taken into a world much more violent and crueler than your own. Needing to survive until you're rescued, you will have to use all your wits, charm, and determination to convince three paranoid skeletons you aren't insane or a spy. Good luck, doll.