Underfell Stories

//Trigger Warning!// This is about the struggling brotherly relationship the Fell brothers are having. It consists of triggering topics, so please don't read if it triggers you in any way. Anyways- You don't have to read this lmao it's boring I know.

Sans gets sick..

Classic Sans finds himself in an odd world, to which he has never seen before. A new au perhaps? He finds new friends along the way and meets up with some familiar faces. Will Sans ever find a way back home? Or will he have to get used to life outside of Frisk's genocidal loop? Updates will not be constant👍

A sprawling collection of Sans x Male Reader and Papyrus x Male Reader one-shots, each exploring different universes, scenarios, and emotions. From lighthearted dates filled with laughter and teasing, to dark, intense encounters in twisted timelines, these stories dive deep into the bonds between you and the beloved skeleton brothers. Whether it's classic Undertale, an AU like Underfell or Swapfell, or even modern-day alternate worlds, each chapter brings a fresh take - romance, angst, action, or even a bit of smut, depending on where the story leads. No two stories are alike, but they all share one thing: you at the heart of it all, finding love and connection with Sans, Papyrus, or even both in unexpected ways. Perfect for fans of slow burns, wild adventures, and multiverse chaos, this anthology will make you laugh, cry, and maybe even blush. 💀✨ Your story. Your choices. Your skeletons.

A long time ago, war reigned in the universe, a war that lasted centuries and only came to halt when the enemy was sealed away. Unfortunately, said enemy has escaped leaving the goddess that swore to protect the universe in a knot, she wasn't ready for his impending escape. But now, she must bring forth her new team of guardians to her at that waking moment. Will she be able to get this new team to work together in unexpected circumstances or will this new team fall before they were put out there, find out in this Book, A new team arises

I have a lot of random Undertale ideas I want to write, but I want to finish "Haunting a Reaper in Training" first, so I'll just write some here. I'll probably expand some of these stories in the future, but if you want to use some of them go ahead. Just let me know so I can read them! Warning: there are ships you may not like. Don't hate. That's all.

Hi there, if by any chance you've happened to stumble across this book, this is me, creating a storyline for my own au which I'll be mixing up with some other familiar ones! The au began on my Instagram where I created an OC called Spooks, who in my au, is Sans and papyrus' older sister. I'll explain more in the beginning chapter of the book. Spooks belongs to me! Sans and papyrus belongs to Toby fox (this variant only belongs to myself) Ink belongs to Comyet Error, Fresh and Geno belong to Crayon Queen Fell belongs to underfell community Blue belongs to the underswap community (as does his brother and any others I mention from his au) Reaper belongs to Renrink Goth belongs to Nekophy Paperjam belongs to 7goodandgel Nightmare(mentioned briefly) belongs to joku If you get the chance, it would mean a load to me if you check out my Instagram (itsjustellii) where I post about undertale and my Au quite often! Enjoy!

There are two known guardians that watch over and protect the multiverse. Such as Undertale, UnderSwap, UnderFell, etc. These two guardians are named Ink!sans and Error!sans, the guardian of creation and destruction. But, what if there was another? One that is a symbol of Yin and Yang. The Guardian of Balance. One that had more than one part to their soul. !Warning!: There may be some cussing, but it will be censored There may or may not be some gore as well Some grammar mistakes This is my first ever Wattpad story, so please be polite if I get something wrong. They will be just a little OP if you don't mind. A Sans Au x Original Character Story.

Blue just wishes to have a happy life with all his friends and no more resets, but when someone mysteriously shows up one day clamming they can make all his wishes come true, blueberry is quick to make a deal.... But could he be getting more then he bargained for? A TRICKSTERTALE (trickster virus) story.

(There may be some Undertale or other AU shippings in this story so let me know or comment what ship you wish to be included, thx! There might also be some sensitive things mentioned through the story so as a small warning, if you are weak with it, I will gladly have this sign, 🔴, as to warn of something is gonna come up, thank you and please enjoy ^^) Papyrus has always been a happy, innocent soul in the undergrounds. For his entire life, Papyrus was the positive, determined monster to keep up his guard and heal anyone with a broken heart. He lived as a little smart kid that was always wanting to dive deeper into both the knowledge of the Undergrounds and even secretly, the surface world in which he has been fascinated to study from his home in Snowdin. As he grew, so did his bravery and responsible nature to protect those he cared for. Even for strangers of the entire Underground. His older brother, Sans, and Papyrus's friend group couldn't ever be happier to have him the way he is: innocent, happy, persevered, pure, brave, and most of all....determined to become part of the Royal Guard. But after meeting up with a question and a ghost of negative pride, accidentally hearing the truth from who should've seen more in him, nightmares of the death of his brother, mentally losing the only support he's ever had, Papyrus felt an emotion that he should've never had, an emotion nobody should ever feel...... .......................................heartbreak.....................................

What will happen if the Afton's children went into Underfell? Will they perish or survive...or find a new family bond? Go to @Awesome1o2 He has the Original Story of Undertale.

I'm actually keeping it to gender neutral terms this time go me! the cliche description He loved them, of course he did you read the title? They didn't even noticed he existed, and he will stop at nothing to make them theirs, even if it meant killing everyb o d y to get you to notice him. The better description You have been drawing for several years, not to the point where you could live a healthy life style, but you're trying, and not to mention you work a library too! Yay for being productive, but you start to notice a red skeleton coming into your place, and staring at you way more than an average human being would, however A: you don't know anything about social interaction. B: This is a monster, so this is probably normal to them, then the disappearances start happening. That's where things get interesting. (warning because I don't trust wattpad: This will have mentions of blood, nothing to serious, because the writer is a big coward, tons of swearing, and unhealthy relationships, oh and yandere sans yay!) (expect a cover this after noon or tomorrow)

In a world where only the strong survive, there is me. I'm not strong, or a survivor, but I'm still here. My parents have kept me hidden from the world, never letting me leave the house. My parents aren't cruel people, they keep me hidden to keep me safe. They have always loved me. Until one day when I ask to go outside. Something inside them snapped and they beat me. That was my first punishment, one of many. It's been years since then and I've finally escaped. Of course I was caught, but I had a moment of freedom. I, however, am no longer wanted after my stunt, and are taken on a camping trip. On this trip, my parents pushed me into a gapping hole in the ground. I fell into the Underground. Where will my life go from here? ____________________________________ This is a reader insert, but I will try my best to avoid using (y/n) and the likes. All the Sans-es (except Underswap!Sans) are evil-ish. Loli!Reader, Innocent!Reader, Abused!Reader, Undertale!Sans, Underfell!Sans, Underswap!Sans, Gaster!Sans. ____________________________________

Just something I wanted to try. Sorry if it's bad. This will contain mature content. None of this is mine. All rights go to those who owns them. You are part monster and human. You can form into a wolf. You have a adult wolf size and a cub form. In your wolf forms you can't talk to people. The only way to communicate with anyone they have to be a part of your pack they have to be blood relative or a mate. And when you change between your human and wolf your clothes do not magically stay on. You are butt naked. Only cuz I think it stupid and makes no sense you would have clothes on.

The barrier was destroyed. Fell Sans was relieved to go meet others who weren't evil from his AU. Fell Sans loved everyone from the AU's, but he had different feelings for just one person. Swap Sans, aka Blue. Fell loves him very much, but he just can't tell him how he feels. Would Blue have the same feelings as Fell?

Classic has been seeing his friends die, over and over again. The human keeps on resetting. In one reset, it all goes wrong. He ends up in a whole new place than he was. The place looks the same just edgier. He finds someone that looks like him and his brother, just edgy. Classic's life changes completely. But soon, he has to go.

As you can tell this is a cherry berry fanfictionnnn! ~~~~~~~~~~~~~~ If you don't like sanscest, then why are you here? 👀 ~~~~~~~~~~~~~~ I'm going to keep it clean. FOR NOWWW. ~~~~~~~~~~~~~~ Enjoy Sanspaissss 💕💕

Here I was again....Back where I started, laying on a patch of golden flowers. My vision, was still blocked, and my body was still numb....From what, you ask? From these flowers blooming on my skin......I had fallen here, I long time ago, and yet....I am back, I could meet the people I loved once again......but how long would that last? How long until.....I die again? How long until my soul shatters.....how long until......it all resets.... I do not own the Flowerfell AU or the original fanfic of it. All rights go to Underfart Snas (The creater of the AU) and SociopathicAngel (The creater of the Flowerfell Overgrowth fanfic), go and show them some appreciation for what they have done ;)

In which you are a kind SOUL trying to help an ex-friend's mishap with a world-defying machine that brought alternates of him and his brother to their world while also dealing with his girlfriend whose goal seems to be making your life a living hell by turning everyone against you. Luckily, you aren't a doormat, and you certainly won't let someone as rotten as her rule your life. [Trigger Warnings will be presented at the beginning of each chapter!]

Red is sick and doesn't want to tell Papyrus