Undertale Fanfic Ideas
- Reads 22
- Votes 2
- Parts 6
MatureOngoing13m
Last published Thu, Jul 24, 2025
A Bunch of ideas, if you wan to use them just give me a warning, I would love to read what someone does with them!!! <3
(Cover art not mine, I was unable to find the creator, if you know please tell me so I can give the credit)
All Rights Reserved
Join the largest storytelling communityGet personalized story recommendations, save your favourites to your library, and comment and vote to grow your community.
You may also like
Sansmate, Vol 1: Ain't nothing like the Wicked
A collection of Soulmate AUs, starring YOU and the 'Evil' Sanses. Prologue sets the stage, and then it's on! Warnings ahead for violence, gore, disturbing reads and lemons....can't have a soulmate without some smut...the letters are literally there. Prologue also introduces the closest I will ever come to inserting myself as Author into a story. Hope y'all like Paradoxical. No 'Evil' Sans shall be repeated, and even you as the soulmate character might change personality-wise to suit the AU. NONE OF THE ARTWORK OR SANS CHARACTERS OR AUS ARE MINE! I just write these little shorts.....I suck at drawing.Complete
A Book Of UnderTale Oneshots But It's mostly Sans suffering
~Discontinued until further notice (Sorry :< )~ angst, fluff, ships, xreaders, (but mostly angst because haha Sans suffering go brrr) I'll do it all! Except Fontcest, I don't really ship that. And Lemons, limes, or smut. Sorry, I'm not a sinner :/ But this book is basically me just putting down random oneshots that come to mind! Lot's are inspired, others are my ideas! Anything inspired I will put credit to the person I was inspired by! There will also be oneshots that I've already written thrown on here! (Avalanche, Stop or suffer, etc.) If anyone actually reads this and has a request, just comment it below. Alrighty, let's start! (btw none of the art in the stories are by me, unless I say so.)Complete
liaison 🩹
𝐍𝐢𝐠𝐡𝐭𝐦𝐚𝐫𝐞 𝐡𝐚𝐬 𝐠𝐫𝐨𝐰𝐧 𝐢𝐧𝐬𝐚𝐧𝐞. 𝐇𝐞 𝐧𝐨 𝐥𝐨𝐧𝐠𝐞𝐫 𝐞𝐱𝐢𝐬𝐭𝐬. 𝐈𝐭 𝐜𝐚𝐮𝐬𝐞𝐬 𝐦𝐚𝐧𝐲 𝐭𝐨 𝐟𝐞𝐞𝐥 𝐞𝐦𝐩𝐭𝐲 𝐚𝐧𝐝 𝐥𝐢𝐭𝐭𝐥𝐞 𝐦𝐨𝐧𝐬𝐭𝐞𝐫𝐬 𝐚𝐫𝐨𝐮𝐧𝐝 𝐭𝐡𝐞 𝐦𝐮𝐥𝐭𝐢𝐯𝐞𝐫𝐬𝐞. 𝐈𝐭 𝐢𝐬 𝐝𝐫𝐞𝐚𝐦𝐬 𝐫𝐞𝐬𝐩𝐨𝐧𝐬𝐢𝐛𝐢𝐥𝐢𝐭𝐲 𝐭𝐨 𝐭𝐚𝐤𝐞 𝐜𝐚𝐫𝐞 𝐨𝐟 𝐭𝐡𝐞𝐦. 𝐈𝐧 𝐭𝐡𝐞 𝐩𝐫𝐨𝐜𝐞𝐬𝐬 𝐭𝐡𝐨𝐮𝐠𝐡, 𝐂𝐫𝐨𝐬𝐬 𝐛𝐞𝐜𝐨𝐦𝐞𝐬 𝐜𝐨𝐧𝐜𝐞𝐫𝐧𝐞𝐝 𝐚𝐧𝐝 𝐰𝐨𝐫𝐤𝐬 𝐚𝐥𝐨𝐧𝐠 𝐬𝐢𝐝𝐞 𝐝𝐫𝐞𝐚𝐦. 𝐇𝐞 𝐬𝐭𝐚𝐫𝐭𝐬 𝐭𝐨 𝐠𝐫𝐨𝐰 𝐟𝐞𝐞𝐥𝐢𝐧𝐠𝐬 𝐟𝐨𝐫 𝐝𝐫𝐞𝐚𝐦 𝐭𝐚𝐤𝐢𝐧𝐠 𝐡𝐢𝐦 𝐚 𝐰𝐡𝐢𝐥𝐞 𝐭𝐨 𝐜𝐨𝐧𝐟𝐞𝐬𝐬.. 𝐀𝐥𝐨𝐧𝐠 𝐬𝐢𝐝𝐞 𝐨𝐭𝐡𝐞𝐫 𝐜𝐨𝐮𝐧𝐭𝐞𝐫𝐩𝐚𝐫𝐭𝐬 𝐭𝐡𝐞 𝐬𝐭𝐨𝐫𝐲 𝐛𝐞𝐠𝐢𝐧𝐬 𝐭𝐨 𝐠𝐞𝐭 𝐛𝐞𝐭𝐭𝐞𝐫, 𝐛𝐮𝐭 𝐚𝐥𝐬𝐨 𝐚 𝐥𝐨𝐭 𝐰𝐨𝐫𝐬𝐞. ✦ THIS STORY HAS TRIGGERING TOPICS SUCH AS DEPRESSION AND SUICIDAL THOUGHTS !! IF YOUR SENSITIVE TO THOSE TOPICS I SUGGEST NOT READING !! ✦ART IS MINEComplete
Home (bad sanses x child reader)
You were an average kid, somewhat having a older mind than most of your classmates. you had always been into the undertale fandom, and even knew almost everything about the aus and soul colors. while what seemed like a normal day at school quickly turned around after a huge bang struck the class room next door. in this story y/n is nonbinary and 12-16 years old. But more interpreted as 14 I post a new chapter every 3 day and 5 days at the maximum. WARNING: this story will mention some forms of slight emotional harm. And Sexual abuse. Readers be safe. Please if you are in any danger, contact someone. You are not alone. With that aside enjoy the story . This story is finished as of September 1 2022, I encourage you to read my other story "Our Disturbing Love" And in the next month or couple weeks I plan on creating another bad sanses x reader.Complete
Capture & befriend (one-shot sanscent)
Mostly about Moonsky sans by https://x.com/moonsans123 and the bad sanses, and ships so :/ This story will contain alcohol, smoking, drug use, swaring, abuse, misspelled grammar and, violence, very detailed descriptions, kidnapping, LBTQR, Lemon, lime, fluff, angst, masking autism, panic attacks, mental illnesses, self-harm, PTSD, experimentation, and very uncafterble topics, TW Rape, and thoughts of suicide, and ships you may feel uncafterble with. If you are uncomfortable with this, then I would recommend not continuing with this book. If you want to leave a request, you can. I will try my best to write as much as possible, and my stories will most likely be split into two parts.
Idea Factory
Undertale ideas, some crossovers. may write them, but also up for adoption. please message me if you want to adopt one as I'd like to read it myself <3
Sanscest One-Shots (old)
This is a bunch of Undertale one-shots. And a bunch of Undertale and Undertale AU ships. Most of these ideas I wanted for books but, don't have enough time nor ideas. The cover isn't mine. Also, all of the characters aren't mine. I'm just giving them the credit even if I don't know all of the creators of the characters.Complete
AU Sans X Reader Long OneShots
Just Sans X Reader No Lemon Cover by my homeslice tkdgirl222 I don't own any of the characters in these story Don't kinkshame me I know your here for the same reason I wrote these >:) Also these are for girls but you can change the pronouns and the girly stuff to guy stuff I don't care. @tkdgirl222 edits and helps write all of the stories.Complete
A collection of Soulmate AUs, starring YOU and the 'Evil' Sanses. Prologue sets the stage, and then it's on! Warnings ahead for violence, gore, disturbing reads and lemons....can't have a soulmate without some smut...the letters are literally there. Prologue also introduces the closest I will ever come to inserting myself as Author into a story. Hope y'all like Paradoxical. No 'Evil' Sans shall be repeated, and even you as the soulmate character might change personality-wise to suit the AU. NONE OF THE ARTWORK OR SANS CHARACTERS OR AUS ARE MINE! I just write these little shorts.....I suck at drawing.
More detailsContent Guidelines