Underswap Stories

When made by his father, the god of death, he didn't know his purpose. All he could do was kill things on accident...he didn't mean to kill them, he just wanted a friend...

[Prolong] My name is (Y/N). I have experienced many resets, so many I have lost count. The only people who remember are Sans, Flowey, and me. The monsters down here are...

Bad Time Trio meets BNHA Disclaimer: I do not own BNHA, Or Undertale, or any of the AU or any of the pictures showed

[Undertale Au's x F!Reader] Can be found in my Quotev Account --> @.FanboilingTrash | AO3 --> @.FanboilingWriter | Tumblr --> @.bdudette When Blueberry and Str...

Kinda like discord but with the Undertale Aus this will be very stupid

A picture perfect family hides the fact that your life is filled with manipulation and abuse. When you move away after high school, you encounter more than one skeleton...

this is a story about a girl who finds little bitties who were abandoned and takes them in little does she know that its harder than she thought and that the bittys won'...

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...

Y/N, meets a new coworker that changes her life forever. A monster, doing his best to make a living after moving out of the underground. Sans is this ecstatic, cheerful...

Long ago, two races ruled the Earth: HUMANS and MONSTERS. One day, war broke out between the two races. After a long battle, the humans... wait no, the monsters were vic...

(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...

Completely female readers unless a request asks different. That's...really about it, enjoy!

! Art is by aozukikawasemi on Twitter ! The bunch of skeletons were taken aback once they took in the unexpected appearance of who exactly? You, of course. You were mind...

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...

*Picture credited to rightful owner* One shots include fluff, and maybe lemons *Requests are Open*

Blueberry - Sans of Underswap. But is he so different from Undertale Sans? Find out as we view Blueberry Sans' life in the Underground. I don't know what rating is used...

Error had had enough. He didn't want to feel anymore. Day in and day out it was always the same. He wanted to finally make it all stop. What will Error do if he gets a w...

as Y/N is walking through the city on the way to their friend's house, they find a box with 3 bitties inside, one crying, one curled up sleeping, and one already trying...

Blue is always keeping himself busy, trying to run away from feelings he keeps catching on too. But it will always eat him up. He keeps acting weird and "not himsel...

(New updated cover) Welp, since you all loved the first two books so much, I wanted to make another. NO LEMONS! ONLY FLUFF! Mostly female reader sorry guys. Mostly be...