Underswap Stories

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..?

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...

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...

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...

A story of a young Ink discovering what it means to be a Protector of Creation, as he finds his place in the Multiverse.

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...

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...

[Previously known as "But He Never Showed It"] Sans has been hiding something lately.. Will Papyrus figure out what's really been going on before it's too late...

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...

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...

chara has reset to many times and someone decides to take action in a way that is.... less than ideal... can you guess who?... no it's not papyrus, guess again

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...

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...

I've seen some Undertale fanfictions where readers and original characters are sucked from our reality and transported in to the reality of Undertale and it's several au...

Ink gives Swap an unsuspecting apple,and in return gave him something in return

Frisk was gone for two years, and two days alone was enough to drive her insane. Wondering, "where, oh where did they go?" she ached to know. But there was no...

Continuation of Mangled Dustberry, a story from my old profile @RoseyRebel . This story also references the events of a crossover from @firehedgehog 's story called Trav...

another au [not finished]

*𝙷𝚎𝚕𝚕𝚘,𝚊𝚗𝚍 𝚠𝚎𝚕𝚌𝚘𝚖𝚎..𝚝𝚘 "𝚃𝚘𝚝𝚊𝚕𝚕𝚢 𝙽𝙾𝚁𝙼𝙰𝙻 𝙱𝚊𝚍-𝚂𝚊𝚗𝚜𝚎𝚜 𝚜𝚝𝚘𝚛𝚢." 𝚃𝚑𝚎 𝚜𝚝𝚘𝚛𝚢 𝚒𝚜 𝚝𝚊𝚕𝚔𝚒𝚗𝚐 𝚊𝚋𝚘𝚞𝚝: 𝙲𝚑�...

(Surface/Multiple AUs) Red and Edge hadn't talked in years. Not since that big fight around 6 years ago. Edge now worked for the police and Red...what was Red doing? For...