Underswap Stories

1.5K Stories

What Happened..? (Dustberror) by SpiritWolfNura
What Happened..? (Dustberror)by Kyran Wolfe
Once upon a time ago Blueberry had a husband, kids, a family. A life. Then someone took that from him, changed him, gave him a different name and purpose. But Blueberror...
Completed
Triple the Threat by funniman2
Triple the Threatby funniman
Shitty BTT fic. Do not read this. This is the first time I am ever writing ANYTHING for ANYONE.
If I die before I wake by TheYarnWitch
If I die before I wakeby ♡♡♡
Ink has lots of people who care about him. Friends, family, random strangers even. But all this gets challenged when tragedy strikes.
Vulnerability by VibeSimpsAlot
Vulnerabilityby VuwV
[Original! Sans x Sans AUs] [ Humanverse ] The lazy excuse of a man somehow ended up outside his world, meeting up with other versions of himself he never knew existed...
All That Remains by TheAngstQueen14
All That Remainsby TheAngstQueen14
A story of a young Ink discovering what it means to be a Protector of Creation, as he finds his place in the Multiverse.
Reborn as sans from UnderSoul  by KarmaAkabane425
Reborn as sans from UnderSoul by Karma Akabane
I was reborn as sans from my own made up au. How did that happen? I have no idea. Luckily I was still a kid so I didn't have to act like how I made sans to act like but...
Becoming an error by KarmaAkabane425
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
Reincarnated Into The UT Multiverse!? Take 2! by Rai_4_Life_4_Fun
Reincarnated Into The UT Multivers...by Rai_4_Life
I don't have much planned for this, I literally am making the chapters in my notes app. Not terribly sorry, but ya know. it might be bad. It's probably bad. Sorry. I'm t...
A Miscalculation In Space by Readern111
A Miscalculation In Spaceby Readern111
He knows he'll be dooming them if he falls, but he's tired, his body is breaking apart, held together on a higher being's whim only. He wonders if there'll be another to...
pregnant horror sans by Moonwolf_230
pregnant horror sansby darkmoon_sans23 [ DARKLIGHTVE...
horror the youngest siblings in nightmare family horror was 15 when he got pregnant by his boyfriend bule by accident when horror and bule were in the heat. horror and b...
"Why Do I Love You?" Fell X Swap Sans!!  by freakypoptart
"Why Do I Love You?" Fell X Swap S...by tart :3
this is one of my first fanfics so i hope its good!!! it'll have no lemon, only fluff and romantic stuff >:3 and maybe some angst but I'm not sure every chapter will...
Dustprint (Reboot) by adamabyss12
Dustprint (Reboot)by adamabyss12
This is just a reboot of a previous version of Dustprint I deleted due to how stuck it made me. Unlike before, where he kills his own father to stop the human, he is bor...
DUSTTRUST HYSTERIA by XxSilverShroudxX
DUSTTRUST HYSTERIAby XxSilverShroudxX
After countless runs, of many run differentiations, from Sans and Papyrus.... Genocide after Genocide...... Nothing seems to change, although these two hold little to no...
The secret-Killer Sans(Killermare) by _Ghost_o_o
The secret-Killer Sans(Killermare)by Tobie
HELLO EVERYBODY this is a new story! this story will be a killermare story but during the process of it there will be other ships with killer and in the end I'll end up...
A Star Sanses Side Gig by PrismarinePalace
A Star Sanses Side Gigby ShinyCrow
Despite how grateful Blue is to be on the Star Sanses, it doesn't pay well (or at all). But when an opening for a waitress job is posted to the community hub, Blue canno...
Reincarnation 0 Undertale Ink Sans by Lordgrimm15
Reincarnation 0 Undertale Ink Sansby Jin Emiya Mori Hyoudou Parker...
0 História Da Minha Série Reincarnation Undertale Focada No Protagonista Que Reencarna Como Ink Sans
Everybody Loves My Kids by SpiritWolfNura
Everybody Loves My Kidsby Kyran Wolfe
Blue Nightmare Ink Killer Dream Horror Dust Error has seven mates and nine kids. How? Well, it had all started with a potion... Sequel to Everybody... Loves Me..?
🌼❤️ ⊹ . ݁˖ . ݁ 𝙐𝙣𝙙𝙚𝙧𝙩𝙖𝙡𝙚 + 𝘼𝙐 𝙃𝙚𝙖𝙙𝙘𝙖𝙣𝙤𝙣𝙨 ୭ ˚. ᵎᵎ by P1ZZ4_M4N
🌼❤️ ⊹ . ݁˖ . ݁ 𝙐𝙣𝙙𝙚𝙧𝙩𝙖𝙡𝙚...by 𖦹 ׂ 𓈒 🪓 / ⋆ ۪𝐇𝐨𝐫𝐫𝐨𝐫...
✦ ─ ✦ ─ ✦ ─ ✦ ˚ ༘ 𝙐𝙣𝙙𝙚𝙧𝙩𝙖𝙡𝙚 + 𝘼𝙐 𝙃𝙚𝙖𝙙𝙘𝙖𝙣𝙤𝙣 𝘽𝙤𝙤𝙠 ೀ⋆。˚ 𓏵‧₊˚ ┊ 𝘼𝙡𝙡 𝙘𝙝𝙖𝙧𝙖𝙘𝙩𝙚𝙧𝙨 𝙗𝙚𝙡𝙤𝙣𝙜 𝙩𝙤 𝙏𝙤𝙗𝙮 𝙁𝙤𝙭 𝙤𝙧 𝙩𝙝𝙚 𝙐𝙣𝙙...
Human Error by calciom
Human Errorby Calcium_Water
Errors boredom extends his narrows sights once more, not content with sitting idle he tries to toy with the multiverse again. However this time, something changes, has r...
Soulkeeper by Sparki0322
Soulkeeperby Sparki0322
This story is a What If scenario based on the Ask Error unfinished Ask Blog. The question is, what if Blue(Swap!Sans), actually chose to absorb the red soul(aka Swap!Cha...