Swapfell Stories

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...

When (Y/N)'s grandma passes away, she moves in her grandma's beach house in Oahu with her ukulele. But what happens when she plays that ukulele by the sea and a "po...

What if someone from our world died knowing a lot from the undertale and their multiverse/underverse? What if that person also knew about the balance and didn't creat to...

Nightmare found a young child a long time ago. When they fell into a coma it sent him over the edge. several hundred years later the child wakes up in a castle of darkne...

(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...

Moved from AO3 because of reasons! "You are the only maid (or worker in general) that serves for the Skeletal Household. It's a skele-ton of work, but you manage by...

(Y/N) was a normal girl but she was homeless since her parents kicked her out a month ago. But that all changed when Nightmare saw how negative she was. But what happens...

Sans and Papyrus were your best friends until randomly they just cut off all contact with you. This went for everyone else in your life so it didn't really hurt that muc...

Cover artist: punny-puntasy ! (TOLD IN YOU/YOUR) A reaper, a few gods, and a bunch of skeletons. The life of a reaper wasn't boring to her, everyday she would gather s...

(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...

Kyra falls into the underground, while there she finds that her connection to the monster realm goes deeper then she thought. Cover by @rykosen Undertale belongs to Toby...

You are a introvert who loves undertale and multiverse and loves to play video games and listin to music. What will happen if one day you meet the skele-bros of differ...

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...

Somehow...I've become a sans...and not just any sans.. I'm classic!? What the flip is going on!? Wait why are different sans and papyrus's showing up at my home? I didn'...

The reader has died and has been reborn as a killer sans but pregnant He has to learn how to use his powers and learn about himself first ------------------------------ ...

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...

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...

Reader insert. What if W.D Gaster didn't just get split between time and space, but actually ended up in your world in an abandoned hospital you called home? Your were a...

You are drinking hot chocolate in your room, but suddenly a loud noise comes out of the kitchen. What is going to happend next? (Pic not mine and unlike the picture, the...

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...