1 - 20 of 67 Works in Underswap Alphys (Undertale)
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After falling into the Underground, you find that you don't have what it takes to break the barrier. You and everyone else are thoroughly disappointed. Things are rough at first, but you slowly adjust and accept that your new life will be among Monster-folk. You work through your trials and tribulations in the Underground, make new friends, even land yourself a job, and... fall in love with a certain skeleton? How charming.
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Sorry for the really vague description, this is my first fanfic 3
So.. I hope it's bearable and that maybe someone will enjoy it ! -
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Waking up buried in snow, alone, and with no memories but basic common sense?
Check.
Seeing numbers, words, and broken text floating around every object and surface?
Also check.
Who is he.
He doesn’t know what happened.
And most importantly...
He doesn’t know why everything feels like he shouldn't be alive.Note from the Me:
This is my take on Fatal Error—a much more none canon, wandering version of him. He’s not fully canon-compliant in terms of power and has a different origin and personality. It’s a reimagining: glitchy, lonely, and filled with questions, bad puns, power and some more puns. -
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this is the story of one of Dr fell Gaster's most loyal followers, France the Underswap Sans, currently the youngest employee under Dr Fell Gaster, and it will explore the actions that made him into the (real life) monster he is today.
(this story is connected to the Raising Ink 'series' and some parts of this story is set between the events of chapter 25 - 28 and may not make sense if you're reading without context)
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Trying to impress your crush by following WikiHow articles? This will not end well! Or will it?
Only one way to find out.
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Sporadic updates. -
How do you forget your own birthday??? by Th3L_ghtSpr_t3
Fandoms: Undertale (Video Game)
17 Apr 2025
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Blue thinks it's a perfectly normal day. The weather is nice, there's fun things to do, he gets to hang out with all of his friends...
Friends who are acting very strange! They keep halting conversations whenever he steps into the room, giggling behind his back, and trying to change the subject when he brings up their oddities!
He had checked his calendar, nothing is amiss, right? Right???
Series
- Part 8 of Destroyer Blue
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“So what you’re saying is, I’m too ‘sans’ for the Star Sanses.”
The blue clad skeleton looked over at the two guardians, eye sockets blank as if he were pondering his next words. He gently gripped the mug in his hands, the bitter smell of coffee permeating the air. He brought it up to his mouth, taking a long, drawn out sip as the two others spluttered. He brought down his mug once more, setting it down at the glass table in front of him.
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The Snow Is Falling and Friends Are Calling by WrittenNovelty
Fandoms: Undertale (Video Game)
03 Dec 2024
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Day 2: Underswap Sledding
They had begged the brothers to take them sledding in the morning, just after they’d unpacked their belongings into the skeletons’ home after dinner. A temporary stay for the Holidays, one they had likewise begged their mother for. It wasn’t hard, as she and Sans were already close friends. What was difficult was getting the two skeletons to agree to the activity.
Chara had pleaded and whined despite Sans having put his foot down. Then they mentioned that they’d never been before in their entire life and everything changed. The next morning, Chara found themselves atop a large trashcan lid with some regrets. The brothers reassured them multiple times that it was perfectly safe, something the two had done since they were babybones.Series
- Part 2 of Gyftmas 2024/2025 Advent+
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Blue had ever planned on anything like this.
You were his and his brother's mistress, but now. Thanks to that damned machine, he has to share you with so many others... Can everyone keep it a secret? Though, Mistress doesn't like secrets, but they have many of their own. -
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Dream knows that his brother is still in there somewhere.
Hidden under layer upon layers of corruption.
Dream still believes the brother he loved and cared for could come back to him.
Maybe this small box he obtained after another one of their fights held the key.
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Idk this was labeled as chicken pox in my google docs but it's Underswap meeting Dream kinda but it's dreamberry and amazing by Always_Sleeepy_Headd
Fandoms: Undertale (Video Game)
27 May 2024
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Basically Underswap accidentally meets Dream at an unconventional time and also Swap being not mentally well a little bit.
Dream too.
Plus, they are engaged by the end!! (It's really stupid and cracky dude Idk what I was thinking when I wrote this.)
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Love In A Warzone (ErrorBerry) [A rewrite of a rewrite] by Always_Sleeepy_Headd
Fandoms: Undertale (Video Game)
01 May 2024
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This is a rewritten version of Love and War (An ErrorBerry Story) from my Wattpad
Underswap is under attack by the God of Destruction! Yet Swap has many other problems to work out at the same time...
Specifically his pronouns.
And dealing with his autism. -
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Sans decides to go on patrol on his day off and finds himself in a dire situation. Will the others be able to help him before the snow is littered in his own dust?
This is a rewrite of my other fic "Under the Bridge"
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For a mission, Cross replaces Swap in an pacifist timeline. With no idea why, he struggles to play along with the plan, causing drama amongst the main characters in Underswap. Could he fix the problem before it gets out of hand? That's for you to find out :) (CANCELED) im so sorry but im to tired of sans stories unless its him just being silly, if anyone would like to take this idea from me i'd be happy to see what you would do with it!
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Blue and Stretch are falling apart until they end up in Underfell. Sometimes something unexpected can bring people together.
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- Part 1 of Underswap #832
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Maybe Ink will never love him, and maybe he's still sore from the rejection. maybe its giving him a cold,
but there's something thrilling about the notes that he's finding in the antivoid.
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Ink rejects Error, can his spirits be lifted by an overenthusiastic Sans who has a knack for baking and kicking ass?
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Papyrus resigned himself as life's punching bag, but that doesn't always prepared him being kick now and then. Like open the door to his house, to his hated enemy Error, or finding out his brother, and his two friends turn into kids. Now he somehow he have to take care of himself and find a cure for his brother and brother's teammates (Star Sans). Luckily he have backing Snowdin and friends...unfortunately something always lurking to knock him down.
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Or Swap Papyrus have to take of the Stars Sans that got turn into Babybones and get help along the way.
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Electric Yellow, Dark Blue, and Deep Magenta by yastaghr
Fandoms: Undertale (Video Game)
05 Oct 2022
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Blue and Alphys negotiate a scene in which Alphys and Undyne fuck Blue together.
Kinktober 2022 Prompts: Double Penetration and Sex Toys
Series
- Part 18 of Underswap #832
- Part 4 of Blue, Kinktober 2022 isn't just about you!
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The Swapfell skeleton brothers are searching the multiverse for Omegas to save their dying species. They end up in Underswap#832. Appalled by the conditions there, they set their souls on saving the Omegas and bringing them home.
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- Part 11 of Underswap #832
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Lap of Luxury by yastaghr for freshywritescrap (freshiewrites)
Fandoms: Undertale (Video Game)
03 Sep 2022
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Swap Alphys has only ever been in love with two people, her Undyne and her Blue. When Undyne dies after Alphys takes the throne, Alphys seeks out Blue. Eventual Swap Salphyne.
Series
- Part 10 of Underswap #832
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Everyone has a soulmate tattoo, yours had to be the one thing every jerk would say. “Hello gorgeous” was written on your shin. Half the time they knew and wanted to be an ass about it, or they did it unintentionally. Annoyed and after holding hope, it’s slipping as you fear as you may never find your soulmate. Little did you know that it had to be someone close and near since monsters surfaced. Let’s see how this interaction lasts, and see how they interact. Thankfully Isabella is there for you and will knock an ass out if needed.