Undertail Stories

You've lived your life without ever knowing your parents. Despite that you dream big because you don't have much; aiming to become a famous singer and prove anyone who h...

Not mine from mark_my_words they're deleting it Soooooo yeah. This is a very long, detailed, vulgar story so BEWARE!

Nightmare, The King of Negativity, known for being cruel and torturing people. But oddly enough he feels lonely, I mean it must be hard when his only friend Error is alw...

Not for kids lmao

It's almost the end of highschool for Killer, an 19 year old student at a human and monster school on the surface. Killer isn't ready to leave the highschool yet as he's...

A skeleton named Sans falls in love with the only thing that makes him happy, that made him feel complete... his brother Papyrus. But when sans suspects papyrus of falli...

This is like my other one shot story except with lemons/smut/sin/sex or whatever else you want to call it. It might/will include boy x boy, girl x girl, boy x girl, and...

As requested by my readers. This book contains explicit content. Stories that follow with your deepest fantasies about the characters of undertale. I take suggestions dr...

Plz give me suggestions of what to do next and if I don't upload for a while it's because I have important things like school homework and I'm probably thinking about wh...

Yep, art not by me by the way, there will be inappropriate references in here

I'm doing the 30 day OTP challenge This will be Error x Blueberry aka ErrorBerry

Hello! Here is a fanfic that I will write for you people who wanted this but couldn't find any.

The art for the title cover is by Pencil_loves_mm on Twitter! Creation and Destruction able to find a balance and keep peace? ...maybe.

Error and Fresh make some lemonade if ya know what I mean. ( ͡° ͜ʖ ͡°) (Very NSFW. Mature audiences only. Have fun reading about two skeletons doing the horizontal tango...

credit to the artist of the cover (I found it on google) ink Omorashi if you don't like Omorashi don't read you have been warned!

" why dont you just take a swan dive off a building and hope that in your next life you get a quirk " was the greatest advice given to the quirkless boy izuku...

Cross discovers his feelings new found feelings for nightmare. I don't own any of the cars in this doc so yea also its gonna have some nsfw/lemon later on so yea, But th...

Just a book about other AU's like ink, sans. fresh error in lt any other AU's and also open for ask and also dare's what ever you like and you can tell me to add other p...

Ah here we go first time writing h a h. Anyways. Lil quick warning there will be -Smut -Fluff -Angst -And some kinks (For example size difference) If you do not enjoy a...

Want to be in a one-shot with the sans of your choice? Well you came to the right place!!! Just comment down below in one of the one-shots!!! Enjoy!!!!