A trip to the muitiverse

Undertale, Classics AU, meets alternate versions of Sans, but things take a turn between scercts and trust between them.

Perfect Story (Highschool Undertale)

Classic was raised in an orphanage called Dreem house in Wild Village along with Papyrus, he loves to stay in the orpganage with his huge family, but having this lingering feeling of needing to go to the City, can't cooperate his peaceful life in the process. It took a lot of persuading to get their caretaker to let h...

Hate Or Love

undertale sans x underfell sans in highschool.

brothers - amnesia

brothers don't always get along perfectly. sans and papyrus have an argument that's consequences will change both of there lives. can papyrus live with the regret?

Kill Or Be Killed

Frisk's fall was rewinding over and over again, It's the same thing for everyone, no one feels the difference in the days. But, a certain skeleton does. Over the years, Neutrals, Pacifists, and Genocides were freely repeated and no one can take note of the pain the skeleton has felt. He keeps a smile on his face even...

Copycat

Undertale truly one of a kind, no matter how many AUs or alternate universes it doesn't have any rivals that can compare to it. Many agree with me, many don't, but we all know the same thing: you are never supposed to mess up an original, and that goes for Undertale too. Undertale is the original of many copies, so...

True Reflections

Cover isn't mine. This is my AU, and my story. If you don't like it, feel free to ignore/leave. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ It was a normal day in Underfell. Monsters fighting each other, monsters getting drunk, and Sans slacking off. It's all normal until Papyrus finds Sans running around, panicking. Papyrus...

The Sworn Protector

This story will be about Sans protecting all the AUs and helping the Star Sanses

Snowdin highschool hell a UT!Sans x UF!Sans story:3

YOLO WASSUP MAH PEOPLE!! K so I'm working on like 4 or 5 other stories so I hope u enjoy this one too XD Actual description: There's 2 new teens at Snowdin highschool and their names are Red (fell sans) and Edge (fell papyrus). Sans finds Edge's brother slightly cute. Will he try and deny his feelings? Or accept them...

Error Sans x UT Sans

i credit alexiafire18 its sin okay.. TS,sin.

ut sans in royal guard

The ut sans is going to be a royal leader and... Well just read this story

. + undusting + .

Uh-so this is a work in progress peice that I might not finish, might finish, dunno. -dust was one of the oldest members of his killer crew, a crew of bad guys. On his recent raid of an au he felt different, almost, caring. Cover art by dusted_dragon and W00ltree!

Classic Sans x AU Sanses Book

The title explains it all.

my sweet blueberry~ classic x yandere blueberry

classic, victime d'un génocide se réfugia dans underswap alors que blueberry faisait sa patrouille pour chercher des humains mais tomba sur classic qui était attaqué par aaron et classic s'écroula de fatigue blueberry, sans réfléchir tua aaron et les étoiles dans ses yeux se sont transformés en cœur il est prêt à tout...

A Different Kind of Love Story(Nightmare xClassic)

so im doing this story because not many people really make. things about this ship.and also because i'm a multi-shipper. other than that I hope you readers like the story!

the matchmaker and the cupid (a matchmaker!nightmare x cupid!classic)

(the cover doesn't belong to me) Nightmare was a matchmaker, he always was a matchmaker, he can make better relationship, meanwhile classic was a cupid, he can make anyone fell in love immediately by using a arrow and a bow. But what happens if they fell in love with each other?..... Inspired by:none

I'll Give You My All, Until I Can't Give No More/ A Kustard Love Story

As long as Classic can remember, he's always had feelings for Fell. He's not sure when these feelings started but he knows he would do anything for Fell. He swore to himself to love and protect him no matter what, but what happens when he reaches Fell's house and he's bleeding unconscious? The sight leaves him with tw...

I Like Bad Guys? (I'm A Bad Person)

A book filled with Bad sanses x Undertale Sans series... Current Series: * The Normal Chapters. ___ * Vampires, Blood, Rust and a little bit of Possessiveness Being the head maid in a mansion was a kinda hard job especially when his masters always seemed to have a liking on him. While he gots to meet the brother of h...

A Classical Secret. [Dropped...]

Classic didn't know what to think when someone he thought he had lost forever showed up on the front door steps of his and Papyrus' house. If he started crying then no one mentioned it. Although he found it odd that none of his alternate versions had this particular someone, he chalked it up to the fact that they disa...

Fleeting Wisps and Searing Flames

This is something I've been working on for a while now. I am still unsure whether I can finish this or not. I originally wanted to make, like, a dozen chapters before posting anything, but I heard it is a certain game's third aniversary lately, so I decided to do this anyways. I can't really promise anything about upd...

The Hedgehog's Song

Sonic holds a secret. A dark secret that not even Tails knows about. He's a merhog, but not just any merhog. He's a Siren, a predator of the sea. He's done well to hide it so far, but when his friends insist on staying at a beach house for a whole week, he's not sure how much longer he'll be able to hide his killer in...

House Wife

3 years ago, Sonic was forced to Marry Fleetaway. For three years he's been kept in the house and tortured. Wearing was Fleetaway likes, saying not to displease him and doing as he says. He drinks in secret and hopes to one day get a divorce. One day, Shadow comes to visit. Becoming found of Fleetaways house wife, v...

Not What They Seem

(Sonic: Uke ; Shadow: Seme) Lemons warning. You all know the cheerful, cocky, fun side of Sonic the Hedgehog. But what does he do when he's not battling Eggman, hanging out with the gang, running, or napping some where? perhaps that's a secret Shadow will keep after spotting sonic from a tree near his window. What c...

For you

All the monsters have left the underground and Sans is dealing with more than he had bargained Cover art does not belong to me

my depressed little sweetheart (kustard)

Originally from @OitsyoboiNm. After countless genocide runs, classic couldn't take it anymore and was getting really depressed. Now it is up to ink, dream and Red (Especially Red 😏) to get him on the right path again. Will they be able to save him before other skeletons get there way?

{ Sonadow } Not all nice guys are nice

♥ Lets just say our little blue friend had been drowning in lies but he can no longer lie to himself and then Shadow and Sonic have been acting more like each other, Shadows nice and friendly and Sonic, he's well.....lets just say Not all nice guys turn out to be nice. ♥ ( Shadow falls for the new dangerous hedgehog...

Misgendered (Sonadow)

Sonic lived in a world where the LGBTQ community was made illegal! Instead of acceptance, they were jailed and forced to a "rehab" center. Sonic was struggling get any attention from females. It didn't matter how much porn or magazines his friends showed him. His focus was always on the man behind the woman. When he a...

Just Another High School (Sonadow vs Sonourge)

Sonic's high school gets a group of new student in the new year. The sudden group of transfers is strange at first but Sonic ignores it, that is of course until a certain black and red hedgehog pulls him away from everyone. Sonic thinking nothing can get worse winds up is a worse situation went a scared green hedgehog...

Roommates (Sansgore)

(Toby Fox owns UnderTale, I plan to replace the cover with my own, and there needs to be more Sansgore like what the actual heck) After the surface was finally in the monsters grasps, they were so excited to move on and find new lives under the sun. However, Papyrus wants Sans to move on and get his own life and house...