Underswap Stories

1.2K Stories

UnderTale Oneshots (FINISHED) by TheGrinningKitten
#1
UnderTale Oneshots (FINISHED)by TheGrinningKitten
(I DO NOT WRITE ABOUT UNDERTALE ANYMORE SO PLEASE DON'T REQUEST ON MY CHAPTERS) (AND FOR THE LOVE OF GOD STOP COMMENTING ABOUT MY GRAMMAR, I AM SWEDISH AND I HAD A HARD...
I love you a skeleTON ( sans x chubby reader) (discontinued! Sorry!) by SierraColor
#2
I love you a skeleTON ( sans x chu...by Sierra Color
Mainly what the title says. Lots of Sans, ton of SANS, Undertale sans, undefell sans, ALL THE SANS. BUT WITH A CHUBBY READER. WHHHAAAAT I KNOOOOW. READ FOR THE FLUFF...
Sans AUs x Reader: Boyfriend Scenarios by GameGeek03
#3
Sans AUs x Reader: Boyfriend Scena...by Lune Moore
Sanses included will be...Classic, Swap, Fell, Swapfell, Ink, Error, Dream, Nightmare, Dust, Killer, Lust, Horror, and Fresh. Please be aware that the pronouns used for...
Naturetale : reborn as lavender  by KarmaAkabane425
#4
Naturetale : reborn as lavender by Karma Akabane
(As far as I know, no one has made a story about naturetale like this so..and the only reason why I writing one like this is because of fatal error part 5? Or part 4, go...
The Christmas Party [Undertale Au's x F!Reader] by _Sansational_Sans_
#5
The Christmas Party [Undertale Au'...by Pᴜɴɴʏ Sᴀɴs
[Undertale Au's x F!Reader] Can be found in my Quotev Account --> @.FanboilingTrash | AO3 --> @.FanboilingWriter | Tumblr --> @.bdudette When Blueberry and Str...
Bone of Contention (Underswap Papyrus X Reader) by TheIndianaCrew
#6
Bone of Contention (Underswap Papy...by Indie
Humanity is divided over one thing---the Monsters' reappearance. Some believe that they should stay aboveground, and others think that they should be sent back to where...
Voodoo (Errorberry) by SpiritWolfNura
#7
Voodoo (Errorberry)by Kyran Wolfe
After Blue's "kidnapping" Blue is returned with an Error doll. Everyone thinks it's creepy, but what happens if it's taken away or destroyed? Then there's a wh...
Unexpected Helper (Nightberry) by SpiritWolfNura
#8
Unexpected Helper (Nightberry)by Kyran Wolfe
Blue is sick of being treated like a child by his friends and family. He shoves down his negativity in order to stay 'happy' like they want though. Nightmare has had eno...
Completed
[You're Not Alone] Underverse Cross Sans X Reader by Kim__chan
#9
[You're Not Alone] Underverse Cros...by Kim
You were a kind human who has a brother named Frisk. You and Frisk always get along until both of you climbed up a mountain. very curious if the legend was true or not...
Bitter Berries by PonchoBow
#10
Bitter Berriesby 𝕂𝕒𝕔𝕙𝕠𝕨
Note to self: Never make jokes about getting reincarnated into a video game character because it'll actually happen. Welp too late to go back now, considering I'm alread...
I'm...swap gaster? by KarmaAkabane425
#11
I'm...swap gaster?by Karma Akabane
Yeah sorry gained an idea on if someone became swap Gaster Also they may be apathetic or just confused on their feelings and MAYBE Autistic, I may be a bit wrong on ap...
A Skele-Ton of Problems (Papyrus/Sans AUS x Reader) by PeachiaKeen
#12
A Skele-Ton of Problems (Papyrus/S...by PeachiaKeen
It was your normal, average day. You were staying at a friend's place while she was away on some adventure in Europe. Next thing you know, some uninvited guests show up...
Becoming an error by KarmaAkabane425
#13
Becoming an errorby Karma Akabane
What if someone from our world became error and didn't destroy au's and left that for nightmare and his gang and claims au's? ( different things including personalities
Undertale Au's x reader 5 by Broken-fnaf-fan
#14
Undertale Au's x reader 5by Artsy is bored.
Yes, here it is the fifth book! I went ahead and decided to make the fifth one now, new book, new ideas! Anyway, request are open, but give me some time to catch up wit...
the unamused captive by Fandomfrenzy625
#15
the unamused captiveby Fandomfrenzy625
being pulled away from your home while your simply enjoying some alone time can be annoying and to make it worse you have no say in the matter as 2 teams keep throwing...
Karmatic Trio (Bad time trio x BNHA)  by DontAskImN0body
#16
Karmatic Trio (Bad time trio x BNH...by ImN0body
This story takes place after the player vanishes from their fight with the bad time trio aka Sans, Shift, Stretch. The three got stuck there for a very long time until a...
Reborn as the tree of feelings by KarmaAkabane425
#17
Reborn as the tree of feelingsby Karma Akabane
What if someone died and became the tree of feelings from dreamtale? Well things won't stay the same, that's for sure. (Different everything etc, different personalities...
Sans Aus x Reader Oneshots (Infrequent Updates) by good_night51
#18
Sans Aus x Reader Oneshots (Infreq...by ᶜʰᵃʳˡᵒᵗᵗᵉ
If you can't tell what this is from the title idk what to tell you... I will do requests and they can be as detailed or as vague as you want. I will do OCs if you want. ...
The One Thing That They Care About (Sans AU x Reader x Papyrus AU) by TheiChronos
#19
The One Thing That They Care About...by 𝐜𝐡𝐫𝐨𝐧𝐨𝐬, 𝐭. 𝐯.
Y/n L/n. A special human with a special SOUL. Yes, her Soul Trait is something new. But other than her SOUL trait she has another secret. One day, while she was at the...
Completed
Becoming papyrus from underswap  by KarmaAkabane425
#20
Becoming papyrus from underswap by Karma Akabane
What if someone became papyrus from underswap? What if they gave their brother more freedom? What if they were the one that error kidnapped instead of sans? (Things wil...