Underfalls Stories

A young human runs out of the ruins desperate to get to safety. She runs into the Skeleton brothers Sans and Papyrus. Before she can know what's happening her world is c...

[Disclaimer that this book is very old nd poorly written, please keep that in mind!] You were shy. You were small. You were picked on. You were told you weren't tall eno...

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...

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...

[Completed] [[Lemon and Swear Warning]] [2019 Jan Note: This book dates back to 2017, where my grammar and spelling checks weren't efficient due to me being lazy. So I a...

A girl who has never seen the world outside of the lab sees it for the first time only to fall down into the underground. What will she find down there?

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...

Y/n was half human and half bird. She had a dark tone of s/c due to her 'disease'. Raven wings was a part of this 'disease', along with interesting eye colors. This caus...

(DISCONTINUED) 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...

Instead of kidnapping the Sans from Underswap, what if Error kidnapped the Sans from Underfell instead? Error x Red You know how Error steals stuff and leaves his garb...

This is a story before the last human fell around the time Chara was still alive and well. Humans were not being hunted till the adopted prince's passing, however with a...

{Yan! Ut! Various x Fell! Reader} [reader is Gender Neutral] [College! AU] [tw: yandere themes, obsessive and posessive mindsets. read at your own risk. i do not condone...

(m / n) (L / n) is a 19 year old boy and he is frisk's cousin, (m / n) always looks after frisk like his own sibling because since childhood frisk has always been treate...

• discontinued • One day an abused skeleton appears out of nowhere. He looked like he needed help... He looked like he needed...love...caring.... The tall skeleton notic...

Underfell Papyrus is viewed as one of the most ruthless monsters in the underground but what is really under that tough persona? Thanks to Tamqul on Deviantart for letti...

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...

One clumsy moment and a broken leg are all it takes to leave you at the mercy of the very edgy and very hostile monsters of the underground. Thanks to your knowledge as...

What if someone is reborn as Error? What if they aren't so bad? What if they're suffering in silence and keeping their job a secret for fear of hate? How will Ink react...

I found this pictures on deviantart,pinterest,google and Frans Amino

So harem book of Charas and Frisks x male reader but real description is below this. The only one of his person in all universes is part of Undertale with an OP powers b...