Undertale and au
55 stories
«Serendipity» [AU x Classic Sans] by Why_are_you_asking
Why_are_you_asking
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Abandoned (it's not even chap 1 yet-) [CLASSIC SANS HAREM] . For all the years he had to survive, Sans never thought that he would be entangled in a case like... this. I mean, the principal of a famous school CAME to HIM of all people! Offering him, inviting HIM to their academy! How could he refuse? Especially after the 'infinite-foods-supplies-without-having-to-pay' discussion (ESPECIALLY that). But still.... Sans tried to think about their purpose. About why they came to him and acting all nice (he's still grateful about the ketchup though. Market this days make it so hard for him to survive). WHY would they invited him? A single nobody who live on streets. To a stray cat (well, MONSTER in his case).... BUT, he can't contemplated it for a long time can't he? There is a life that he has to survive. So, here he is now. Standing in front of his new dorm (his new home). Sans smile a bit. A rare genuine small smile. Finally, he can start a new life. A new start. A new page. A new book. Sans open the door. ◇◈ Hello, dear~ In case you are new to this fandom or didn't know, this is the typical story of Classic Sans going to highschool.... Unoriginal, i know. Hope you are interested enough to click this book. Enjoy it while you can. Fair warning though! My English is sucks. Bear with it. Same case with grammar!~ △WARNING!▲ ▷Profanities. ▷Slow Update! ▷BAD STORYLINE. ▷Errors in English and Grammar ▷Once again, BAD ENGLISH AND GRAMMMAR! ▷DANG IT, PEOPLE! READ THE GODDAMN WARNINGS!! ▷etc... Cover from: wombo.art [Why_are_you_asking] [23 February 2022]
Butterfly Curtains - Undertale and AU's FanFiction by Corpsetalia-fan
Corpsetalia-fan
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Classic Sans has been missing for years, and none of the AU's know where the chill, spunky, Original version of themselves as went. All ways to get to his world have been blocked off, and there have been no other ways to get to his world discovered. That is, until, Ink, Dream and Nightmare all got into an argument. When the worried AU's finally reach the world of Classic, what will they discover? What will they encounter in this very much altered universe that has them questioning whether or not this is actually the original timeline- and, better yet- what will happen then they encounter their long lost contact of a friend again and discover just how broken he really is? The world of dreams is a strange, and magical place. Too bad no one ever said it was always a good one.
My knight (kustard prince!fell x knight!classic) by fernoblazehybrid
fernoblazehybrid
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Fell was just ordinary prince who would always stay in his castle, and not leaving the castle, because of his father after his mother died, until fells father gets a knight for fell inspired:none
an unexpected love~ (classic sans x AU sanses)  by Jola-chan
Jola-chan
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!!SMUT!!! 13++ WARNING: SWEARING AND CRINGE LOAD!! (Edited im 2022 May 4th: STOP READING THIS HOW DO YALL LIKE READING THIS BS AAAAAAAA) (Edited in 2021): I regret making this book- also just a reminder: THIS FANFIC HAS SO MANY MISTAKES SO PLEASE STOP MAKING FUN OUT OF ME- 😭 and please don't say this is a good book while it has so many cringy crap inside *Made this description on June 24th 2020* I got inspired by many fan fics about this ship so I had to make one too :) there will be some drawings that I didn't make! these amazing pictures all belong to the artists out there! (I might even change the description of this) the AU sanses were having a meeting and discussing about an original AU that they can't find for years until error came late for the meeting and found something very special in his void
Royal Blue by dealialestina
dealialestina
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Sans knows a lot about secrets; he hides many. But when old burdens emerge from the darkness, secrets, new and old, put his brother in danger; and what else can a good big-bro do but begin a double life? This decision haunts him, even years after his suit of armor is stocked away and hidden, after his quaint life of depression, puns and resets are set to loop forever, and his part in the war is forgotten... But then, the barrier is broken. And it is quickly realized that this is not the end, but a beginning of something new. Something that feels like dust, blood, and a suit of armor; an old lie to slip into once more. (Currently being completely overhauled! Anything without a chapter title (ex.: chapter 4, chapter 5, etc.) is old and will be re-written!)
No One is Happy with This (Undertale) by ANinnyMouse42
ANinnyMouse42
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~o0o~ Book 3 of the "Better Times" trilogy ~o0o~ (Book one: "The Time Before") (Book two: "A Name to Remember") Two years after the Barrier was destroyed, it's a dark and stormy night. A group of friends; six monsters, one human, and one flower, celebrate the anniversary of the monsters' freedom. Everything starts off with a seemingly innocent question: "What does the thunder remind you of?" But the answer only leads to more questions. Questions born of curiosity. Curiosity killed the cat. And it's a hard learned lesson that Determination can't always bring everything back.
Irreplaceable || A Kustard Fanfiction by StarFallShin
StarFallShin
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(Currently on Hiatus) After a whole so-called 'Multiverse Collision', multiple AU's have clashed together as pieces in some sort of puzzle. How it happened? Nobody knows for sure. However, even if there were multiple AU's, Undertale (the original) is the one that's the core of them all. Fell was one of those that were in the collision, but the thing was.. He absolutely despised the Classics. Why? Because they thought they were so much better, at least that's what he thought and saw for himself. But when someone manages to convince him, he goes over for a visit to the original timeline, deciding to see for himself just how the Classics really were. Yet what he didn't know was that he was gonna find a person who would change his opinion on the Classics completely..
Kustard Soul Mates (in writing process) by Yuki_TheDarkWolf
Yuki_TheDarkWolf
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sOoo I've had this idea where they have soul mates. Like everyone is born with a half heart necklace. Every time the person gets near their soul mate it will heat up as they go farther away it gets colder. EEE I couldn't decide wether I wanted this to be errorfresh or kustard so not many people like errorfresh so it's kustard ;-;
Dark Secrets by StaticImpact
StaticImpact
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(Cover art is NOT MINE!!) (Last update March 18 2023 After Error destroys Underfell. Ink moves the Fell bros in with the classics and they dont understand but something draws them together. Meanwhile Ink tries to detour Error from his destructive ways and at the same time Reaper and Geno are forced into the Classics home as well. These 6 skeletons will have to learn to face their own problems in order to take down the one thing that has been hunting them down.