Underfell Stories

‼️⚠️WARNING: MATURE THEMES SUCH AS SEXUAL ACTIVITY AND TW'S PLEASE READ AT YOUR OWN RISK⚠️‼️

//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.

AUTHORS NOTE: This story wont be updating fast. my work is kinda hellish right now. (Y/N) otherwise know as the internet idol (I/N) has had her sister Frisk disappear on her. When she sees Frisk again she finds out that Frisk has freed the monsters. How will everything work out?

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.

After the monsters broke free from the underground they enslaved all of humanity. The monsters took complete control over the world and the world was powerless to stop them. This is the story of a young boy named Matt O'Donnell, a boy who was an orphan during the time of the monster invasion was captured by the prince of monsters, Asriel Dreemurr. Will he find a way out of this dreaded nightmare and be free or will he suffer and die. (I don't own any of these pictures)

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.

It has been 10 years since the monster broke free from the barrier, and since then monsters and humans live together in peace. But for some reason, monsters have somehow got a mini version of themselves, no one knows how or why it just happened. And for some reason, the skeleton bittys are popular because of their many different versions. You are a 19-year-old girl who lives in New York City in your apartment the problem is that you're all alone( if you're wondering if your family is alive, you just live far away from them), you have a small dislike for people. You wish you could get a Bitty to hang out with it, but the problem is that it costs a good amount of money. So you could never get one or so you thought until one day you find a strange box. This is my first time posting here so I hope you enjoy it! Also note there is some swearing. Note the cover does not belong to me. It came from https://undertale-au-fanon.fandom.com/wiki/Bitty!_Sanses By The Edit Lord Also I do not own any of the characters. Undertale belongs to Toby Fox.

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. ____________________________________

Classic is from a really normal AU. The other AUs are much more stronger than him. He would probably dust if he tried to fight anyone of them.. But what he realised was.. he was more than what he thought he was... The True King.. The cover art doesn't belong to me. It belongs to MsShadowFlower on Deviant Art. (I think)

A stand-up comedian with a bad temper and low motivation ends up falling for Frisk's homeroom teacher, her irritatingly soft voice, and her smug attitude. Who would've known? There's probably a lame old joke hidden in there somewhere, but he doesn't give a damn about that right now, so maybe come back later, and he'll think of something. (Mostly told from his perspective, but there will be chapters featuring Second Person POV.) ★ ★ ★ • Cover Image Source: chiarasanchi (WordPress + DeviantArt) (wordpress.org/openverse/photos/65392096-97cb-4d5e-87d8-187508aed9cf) • Content Warnings: language mild violence suggestive themes implied alcohol abuse references to depression Please proceed with caution! This is the SFW, 'Fade to Black' version of Where's the Punchline?, so if you're old enough to read the Mature version, then it can be accessed through AO3. • Updates: Fridays - Weekly • Other Stories: Lord, Have Mercy! (Undertale | Sans x Reader) Be Still, My Heart! (Mafiatale AU | Sans x Reader) Strawberry Soap (Overtale AU | Sans x Reader)

Life has many Ways to go. but Papyrus choose his life to be a little twisty. and His friend Nessy is the only one what's important to him. so he became a little complex. what will happen? ⚠️Waring⚠️ GORE BLOOD AND SOME SMUT. AND SOME CREEPY STUFF. character's papyrus sans muffet undyn alphys toriel asgore frisk Nessy

(Y/N) (L/N) moved halfway across to country. She's a sweet human who grew up with Horrorswap Sans. She got skittish around 6 months ago. How will she adjust to her new town and school?

Red have always been alone. He never had someone to call his own. Of course Red have a brother. He loves Papyrus dearly, even tho Papyrus doesn't like him. One day he finds Classic. Red and Classic have almost the same problems Classic and Red gets close. Maybe even to close? Disclaimer: This story have: Cutting, Suicide thoughts, Blood and depression. If you're uncomfortable reading about this. Don't read.

Sans gets sick..

SHORT Stories SHITTYT'nnnn

Re:Fell (Underfell X Re:Zero), created by LazyRandomContent and Nova, is a story set in the world of Re:Zero, where Underfell Sans and Papyrus face dangerous challenges that will test their strength, wits, and the bond between them.

In Mount Ebott, far from the surface of the earth, in The Underground There live the kingdom of monsters ... Ruled by a King, Asgore Dreemurr and the lost Queen, Toriel Dreemurr and the long lost Prince, Asriel Dreemurr. Who have turned into a flower himself A place filled with sorrow and despair because of the humans One day, a human child fell, the Queen noticed but leave it astray. The Prince, in His flower form, with pity filled in his eyes, helped the human child and be their company until the rest of their journey, back to the surface ... But what happened during the journey? Well, here is the untold story ...

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)

How Papyrus and Sans deals with Sans running away. Maybe their lives will intertwine again. This is an alternate version to the AO3 story 'April Fools'. In the orginal, Sans stays. In my version, Sans runs away. Enjoy!