Sweet But Psycho (Yandere!Toriel x OC) [Undertale Crossover Fanfic] [[Paused]]
rubymusic43
  • Reads 11,667
  • Votes 51
  • Parts 20
  • Time 1h 38m
  • Reads 11,667
  • Votes 51
  • Parts 20
  • Time 1h 38m
rubymusic43
Ongoing, First published Oct 09, 2021
Mature
alternativeuniversecorruptioncrossoverfanfictionglitchlovesickocsromancetobyfoxtorieltorielxocundertaleyandere
After the events of the neutral route, Ryobo and his brother decided to reset and try everything again.

Once they fell into the Underground, and started the pacifist route, Ryobo couldn't help but feel like there was something very strange about Toriel that will soon take a dark turn after they reached the end....
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A heads up from me, most of the chapters will be based off of the "Yandere Ralsei! AU" by andy-shempai (from Tumblr)

Also, if you haven't played Undertale and Deltarune, please do so you'd know who the characters are.
________________________________________
Undertale belongs to Toby Fox. I own nothing from him and his characters.

The only characters I own are my ocs.
All Rights Reserved
alternativeuniversecorruptioncrossoverfanfictionglitchlovesickocsromancetobyfoxtorieltorielxocundertaleyandere
Table of contents

20 parts

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Undertale : Secrets (REMASTERED) by ItIsComic
31 parts Ongoing
Sans has had an interesting past. A past that even his beloved brother barely even knows of. A past that, despite being so long ago, always finds a way to bite back. A past that defines who he is - but he longs to erase. A past that doesn't let go, it clings to him despite his endless attempts to escape. And when someone finally attempts to uncover the veil, and fails in the process, what happens next? This book is a complete remake of the original Undertale: Secrets that was made nearly 3 years ago. By remake, I mean that this book takes the general plot of Secrets and basically "tries again". This will reuse elements of the original and cut out the parts I don't like while adding my own new ideas, effectively creating a new book. Whether you liked the original or didn't even read it, I hope you like this!! Inspirations: The "Better Times" trilogy by: @ANinnyMouse42 "Royal Blue" by: @dealialestine Started: 17 March 2024 Finished: Not yet! Undertale by Toby Fox
Into The Game >> (Sans X Reader) Undertale FanFiction by Melody4164
23 parts Complete Mature
It was just a normal Saturday. (Y/N) was playing Undertale for the millionth time. She was obsessed. (Y/N) had played all of the routes. True Pacifist, No Mercy/Genocide, Neutral. She experimented with killing certain characters doing different things. Then, as (Y/N) started a new game, she felt a falling sensation, as if she just fell out of her chair. She blacked out soon after. When she woke up, she was lying on a bed of golden flowers. She knew this place. (Y/N) was in the game. She had taken the place of Frisk and was in the Underground. •Disclaimer I do not own Undertale. It belongs to Toby Fox. I do not own you. You own yourself. I do not own the cover or any of the pictures that will show up in this book• *If you're reading this as a guy please just change the pronouns to he/him/his. I find if a lot easier to just put female pronouns. Thanks! :3 *
Forgotten Phoenix (New Purpose Sequel) by OreoDaSkeleton
30 parts Complete
It's been a few years since Y/N started her family. Without Honey, she made due with what she had; that being the cafe, her brother-in-law Blue, and her two twin sons. Of course she missed Papyrus. There was no doubt about that. Though, she had to learn to accept his passing. Her sons did not... One of her sons soon makes a secret deal, causing the whole world to reset back in time. The family of three wakes up in the underground. Two family members are now in dire need of medicine. They resolve to find help, get medicine, and find a way out. That is, until a familiar face steps back into their life. AAAAA- HI! It's Oreo aka Writer~San! This is a SEQUEL to one of my books! SECOND! If you haven't checked the first (New Purpose), THEN yoU nEeD to STaRt thErE! XD Also, Undertale and its characters don't belong to me, and is rightfully owned by Toby Fox. All Underswap characters rightfully belong to their owner as well. The writing in this book, though, is completely mine! Please enjoy (owo)~🖤
UNDERVERSE by isimpforanimeboys1
15 parts Complete
!THIS BOOK WILL NOT BE UPDATED!FOR FULL STORY, CHECK OUT JAKEI ON YOUTUBE AND PATREON! The story takes place in a post-Pacifist timeline in the original universe of Undertale, where half of Sans' soul is stolen by a corrupted alternate version of himself known as Cross, who has his Chara inside his body. With the help of Ink -the guardian of the AUs- Sans will travel through the Alternate Universes to recover his soul while he discovers the origin of Cross and the imminent danger that will put the Multiverse at risk: The Overwrite button. Undertale - Toby Fox XTale - Jakei Inktale/Ink - Comyet/Myebi Error - Crayon Queen Fresh - Crayon Queen Aftertale/Geno - Crayon Queen Dreamtale/Dream/Nightmare - Joku Underfell - AU Community (The creator wishes to remain anonymous) Underswap - AU Community (The creator wishes to remain anonymous) Outertale - 2mi127 Core! Frisk - Dokudoki Undernovela - Pig-Demon Killer! Sans - Rahafwabas Fatal! Error - Xedramon Mild Swear and Violence Warning. Hope yall enjoy my suffering :D (Original story by Jakei - Transcribed by isimpforanimeboys1) Hey! You've reached the bottom. Quick note, the editing in this is quite bad. I wrote this in 6th grade, and I'm not very proud of it. There are multiple mistakes, such as me calling Underswap!Chara Frisk, and referring to X!Chara as they/them. PLEASE DON'T PAY ATTENTION TO THESE MISTAKES. THANKS FOR READING THIS.
"Psycho for you, but can't control it..." Yandere!Kris x Reader by SamatheCreator
21 parts Complete
Art by: InviSeri on Deviant art Cover made by me! Characters from Deltarune: By Toby Fox . . . You are a (insert your species, being human, demon, or a monster in general!), you moved with you parents, whom don't actually want you to have any relationship or friends with anyone, but then you met Kris, they where fine at first but... they slowly started to change too... why was that for? . . . TW: the story may contain: D**th, Bl**d and Curse words. I just want all of you to be aware of what is going to happen, so please take in mind this, thanks! #1 Rankings to date! - #1 Krisdeltarune on 1/4/2021! #1 Deltarune on 9/22/2021! #1 Fluffybois on 6/2/2022!
●~My Prisoner~● [UF!Papyrus x Fem!Reader] by xxAstrixZxx
47 parts Complete
[Completed] [[Lemon and Swear Warning]] [2019 Jan Note: This book dates back to 2017, where my grammar and spelling checks weren't efficient due to me being lazy. So I apologize for typos if any.] ---------------------------------------------------------------------------- How much more could a young girl possibly take? In a world where humans are brutal, one girl couldn't stand through the odds. She was at her tipping point, an all time low. Her family was horrible, mistreating and abusive, where she just couldn't take it anymore, she had to jump. Unfortunately, Death gave her a chance to live on, and with that brought new enemies and new friends. How will the tables turn as she meets un-forseen creatures in this new place: The Underground? And who would be her guardian angel in such hellish conditions? ---------------------------------------------------------------------------- Highest Rankings: - 1st in Underfell - 1st in UnderfellPapyrus - 1st in UndertaleAU [Undertale belongs to toby fox. The AU belongs to it's creator. The images belong to their original artists. I only own the plot of my story] Story by me Papyrus from Undertale AU, Images and Music in the story belongs to their rightful owners. [ 3/1/2017 - 20/2/2017 ]
A Decision (COMPLETED) (An AlterTale FanFiction) by BubblyShip
14 parts Complete Mature
(UnderTale belongs to Toby Fox, and the AlterTale AU belongs to friisans. I only own this fan fiction of this AU, I decided to write this because there aren't enough fanfictions of this AU! Tis my own cover art.) "Knock Knock." "..." "Who's there?" "..." "Cow says." "..." "Cow says who?" "..." "No, the cow says moo!" "..." "Knock knock." "...Who's there?" ~~~~~~ Toriel had become quiet happy with her life. She had an awesome brother, a nice house, she had grown close to all of her friends, and the monsters only needed one more human soul to escape. Not to mention she had a free door to practice all of her jokes on. But one day, someone answered. Over time, Toriel and the voice behind the door had grown close between their knock knock jokes, Everyday she would go there and they would practice for some time before she would leave once more. But one day, she learned his name, and it all went downhill there. Knowing the man behind the door was the long lost brother of one of her lifelong friends, King Papyrus, she had to make a decision. Tell her King about his brothers location, or keep it secret and lie. In the end, her decision might affect everyone. (This fanfiction is COMPLETED! There will be NO MORE UPDATES!)
Timeline for You, A Chasriel Love Story | Undertale AU by AshdorCrush
36 parts Complete Mature
[This story is officially completed, and any A/Ns have been removed for best reading experience. Enjoy!] A month after Frisk freed all monsters, Chara and Asriel return to life. Life on the surface went well for a few years after that, but something resonated with Asriel and Chara. Chara and Asriel like each other, but neither of them know about it. But when someone threatens to break their bond, things start to fall apart. Can best friends really love each other, or will they be destined to HATE each other? This story will contain vulgar/sexual language, suicide, rape, violence, gore, and blood. UNDERTALE, its characters, lore, and locations belongs to Toby Fox Custom characters(OCs) made by me
Just SING | Sans X Reader by artsyTrashpile
36 parts Complete
--Long ago, two races ruled over Earth-- --HUMANS and MONSTERS-- --One day, war broke out between the two races-- --After a long battle, the Humans were victorious-- --They sealed the monsters underground with a magic spell-- --Many years later...-- --MT. EBBOT, 201X-- --Legends say that those who climb the mountain never return.-- What if the legend is real? And what if the legend was all wrong? Start date: 4-25-2017 End date: 1-14-2018 Undertale & Characters ~ Toby Fox Plot, Book & Cover art ~ Me You ~ Sans ;) (I do not know why, I just keep putting 'You belong to Sans'/'You ~ Sans in all of my Sans X Reader descriptions from this point forward.) (Warning: Mild language and uh... fangirliness? Maybe, I don't know if you humans think this something to fangirl over.) 1K [•] Date: May 20, 2017 5K [•] Date: July 27, 2017 10K [•] Date: September 6, 2017 25K [•] (probably wont happen) (and iT DID HOLY SHIT THANK YOU SO MUCH I CAN'T) January 16, 2017 50K [•] Date: August 19, 2018 (what the fuck???) 80K [•] Date: February 1, 2019 (y'all... what the HECK) 100K and #1 in the #sansxreader tag [•] Date: July 2, 2019 *wheezes* what the FUCK how did this shitshow get #1 in the fucking SANSXREADER TAG thank you????
He's Mine (COMPLETED)(Yandere Papyrus) by BubblyShip
10 parts Complete Mature
(UnderTale rightfully belongs to the amazing Toby Fox, I am not creative enough to make that masterpiece. There is a person named symphysins who drew some work of Yandere UT! Papyrus for Sans, and I really liked the idea of a creepy UT! Papyrus and decided to write a short story on it. Also, Frisk can't reset, she never had that ability. The cover is my own art.) "Why is everyone I date dying?" Sans asked, covering his eye sockets. "Am I cursed or something?" "I'm sure you're not cursed, Brother!" Papyrus said, patting his back. "T-There might b-be a Yandere on t-the l-lose!" Alphys piped up. "A Yandere?" Sans asked, tilting his head. "What's a Yandere?" ~~~~~~ Sans felt like something was wrong. Everyone he tried to date ended up dusted, and he couldn't figure out why. So, when Alphys explains to him what a Yandere is, he realizes he might be someone's Senpai. Determined to stop this endless cycle, he teams up with his friends to try and find this psychopath. If only they knew he was closer than expected.
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Slide 1 of 10
Undertale : Secrets (REMASTERED) cover
Into The Game >> (Sans X Reader) Undertale FanFiction cover
Forgotten Phoenix (New Purpose Sequel) cover
UNDERVERSE cover
"Psycho for you, but can't control it..." Yandere!Kris x Reader cover
●~My Prisoner~● [UF!Papyrus x Fem!Reader] cover
A Decision (COMPLETED) (An AlterTale FanFiction) cover
Timeline for You, A Chasriel Love Story | Undertale AU cover
Just SING | Sans X Reader cover
He's Mine (COMPLETED)(Yandere Papyrus) cover

Undertale : Secrets (REMASTERED)

31 parts Ongoing

Sans has had an interesting past. A past that even his beloved brother barely even knows of. A past that, despite being so long ago, always finds a way to bite back. A past that defines who he is - but he longs to erase. A past that doesn't let go, it clings to him despite his endless attempts to escape. And when someone finally attempts to uncover the veil, and fails in the process, what happens next? This book is a complete remake of the original Undertale: Secrets that was made nearly 3 years ago. By remake, I mean that this book takes the general plot of Secrets and basically "tries again". This will reuse elements of the original and cut out the parts I don't like while adding my own new ideas, effectively creating a new book. Whether you liked the original or didn't even read it, I hope you like this!! Inspirations: The "Better Times" trilogy by: @ANinnyMouse42 "Royal Blue" by: @dealialestine Started: 17 March 2024 Finished: Not yet! Undertale by Toby Fox

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