Red Mask
- Reads 310
- Votes 35
- Parts 9
Ongoing26m
Last published Fri, Jun 19, 2026
Underfell is a dark and dangerous place filled with murder in violence, and Sans and Papyrus are the pinochle of it all.
So nobody would ever suspect Sans to come back after a lost bet.
Maybe you haven't seen all of what's under Red's mask, huh?
Request for Icecream_Shipper
All Rights Reserved
#752
guitarist
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Home (bad sanses x child reader)
You were an average kid, somewhat having a older mind than most of your classmates. you had always been into the undertale fandom, and even knew almost everything about the aus and soul colors. while what seemed like a normal day at school quickly turned around after a huge bang struck the class room next door. in this story y/n is nonbinary and 12-16 years old. But more interpreted as 14 I post a new chapter every 3 day and 5 days at the maximum. WARNING: this story will mention some forms of slight emotional harm. And Sexual abuse. Readers be safe. Please if you are in any danger, contact someone. You are not alone. With that aside enjoy the story . This story is finished as of September 1 2022, I encourage you to read my other story "Our Disturbing Love" And in the next month or couple weeks I plan on creating another bad sanses x reader.Complete
Not Just Evil (Underfell Papyrus X Reader)
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 letting me use their awesome artwork as the cover!Complete
Fight or Mercy | Underfell x Abused! Reader
[2nd book] ((COMPLETED)) {Undertale AU - Underfell} [WARNING:ENDING AND PLOT IS VERY CRINGEY] "Long ago, two races ruled the earth, the Humans and the Monsters. One day, war broke between the two races. Many have fallen to serve their kind. Years later, the humans were victorious. With their magic, seven of their strongest wizards sealed all the monsters underground with a magical barrier. Only a human soul could pass. Mt. Ebott 201X, they say those daring enough to climb up the mountain.... never return. " "Leave them, Y/N! Run! " ___________________________________________ I'm a Undertale addict. I freaking love the story line and characters! One of my favorite AUs is Underfell so I'm finally making an X reader. Also, if there are wrong spelling or grammar, please tell me. I'm using GoKeyboard. Enjoy my Crappy 2nd book!Complete
Reset (Underfell Brothers)
Papyrus was doing his normal schedule, waking up in the morning, shouting at his brother to wake up, and if he is late, you know who is getting the beatings. Usually, Sans would be terrified however, lately Sans has been different. He woke up on time, never sleeps at the sentry and frequently does mistakes. When he does, he would often gave an apologetic smile, never once he be upset or scared or angry at Papyrus. What really happened to his Sans? - Not a Fellcest- All Characters belong to Undertale except for Captain Rogers.Complete
Write A Note (Sans x Female!Reader)
It's only been a few years since monsters have been released from their underground prison. In some towns, monsters are welcomed with open arms. Others? Not so much. Y/N is a 22 year old girl that lives a pretty simple life. Sleep, eat, work, relax at her daily cafe, go home, sleep. Then the routine starts again. However, her routine is thrown off when she keeps running into a skeleton, supposedly named Sans. She would like to get to know him more herself, but there's one problem.. He doesn't talk. Of course, Undertale belongs to Toby Fox, not me lolComplete
Your Fault ~ Underfell Fanfiction
{COMPLETED} Sans' life isn't easy, and living in an Underground society filled with torture, rape, and murder doesn't make it any better. Every single day is a struggle, and Sans tries so hard to fit in with other monsters and live up to his brother's standards, but sometimes it's just too much. Will Sans be able to pull through, or will the darkening thoughts that are engulfing his mind and Soul take control, and swallow him up into a void too deep and dark to ever imagine? DISCLAIMER: UNDERTALE is owned by Toby Fox. UNDERFELL belongs to the AU Community. COVER IMAGE edited by me. I do not own the original image. PLOT/STORYLINE belongs to me. The events in this story are not canon and are simply for the entertainment of myself and my readers. Any OCs mentioned in this story also belong to me. MATURE CONTENT WARNING: The events in this story contain mature content that some readers may find triggering and/or disturbing. Read at your own discretion. Thanks!!Complete
Silently Sleeping (Underswap!Papyrus x Reader)
Underswap!Papyrus x Reader And some Fresh!Sans x Reader -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- It isn't hard to slip into a dream. You're happy with what your mind makes up and you stick with it until you wake up. Nightmares are hard to sink into. Death, tears, bloodlust, screams of terror and agony. You eventually wake up crying and wondering why your head would come up with something so sadistic. You're not in a dream. You never were. It's always been a nightmare. Always. -_-_-_-_-_-_-_-_-_-_-_-_-_- "My heart fills so... empty." "Please don't do this, (Y/n)!" "I'm sorry I caused so much pain... but we both don't have to suffer anymore."Complete
My Fault - Underfell Fanfiction (Sequel to Your Fault)
{COMPLETED} It has been just two weeks since the event that changed Papyrus' life forever. Too late, it seems, he realized what he had. And now that it is gone, he has fallen to pieces. How, or if, he will be able to cope, he truly does not know. And as if that wasn't enough, there are countless mysteries in store for this burdened skeleton-- coming from people he thought he could trust, and in places he thought that he knew. Will Papyrus ever be able to solve the mystery behind this devastating chain of events? Or will he, too, fall prey to the ever-expanding void that is engulfing the souls of himself and everyone around him? PLEASE NOTE: This book is the second in its series. It contains major spoilers to the first book, as well as this book may not make much sense without having read it first. So, if you want to keep the excitement of the first book without any major spoilers, I HIGHLY suggest going and reading that first. It is titled Your Fault. DISCLAIMER: UNDERTALE is owned by Toby Fox. UNDERFELL belongs to the AU Community. COVER IMAGE edited by me. I do not own the original image. PLOT/STORYLINE belongs to me. The events in this story are not canon and are simply for the entertainment of myself and my readers. Any OCs mentioned in this story also belong to me. MATURE CONTENT WARNING: The events in this story contain mature content that some readers may find triggering and/or disturbing. Read at your own discretion. Thanks!!Complete
the Undertale Adventures
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A Bad Change (An Original) UF san's and UF Papyres story)
Edge thought he was going to be back without Red knowing but when he stepped inside the house he didn't expect everyone and I mean EVERYONE to be there. They tell Edge to either be nice to Red or they would force him to. As anyone who was told that and especially Edge took it as a threat but before Edge could do anything, he was tied down. The next thing Edge knew he was taken somewhere and started to scream, shout, kick, and cry out from the pain before he passed out. When Edge and Red meet up again, Red feels something wrong, he was happy to see Edge again but he didn't act or talk the way Red knew at all. Red got a sick twisted feeling when he didn't see the shine in his eyes, a shine he always had...... The cover is NOT mine it's From kyoma1719.tumblr.com In this story, they will have some of their elements game things and looks. I just thought this was a cool fun story I made up. I have other stories that am writing so am putting up the parts that are done. It will take time to write it. so slow updates don't judge :/ What WILL contain- *blood *weapons. *swearing *fights What will NOT contain- *Smut *ships November 20, 2021 - February 21, 2022Complete
You were an average kid, somewhat having a older mind than most of your classmates. you had always been into the undertale fandom, and even knew almost everything about the aus and soul colors. while what seemed like a normal day at school quickly turned around after a huge bang struck the class room next door. in this story y/n is nonbinary and 12-16 years old. But more interpreted as 14 I post a new chapter every 3 day and 5 days at the maximum. WARNING: this story will mention some forms of slight emotional harm. And Sexual abuse. Readers be safe. Please if you are in any danger, contact someone. You are not alone. With that aside enjoy the story . This story is finished as of September 1 2022, I encourage you to read my other story "Our Disturbing Love" And in the next month or couple weeks I plan on creating another bad sanses x reader.
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