Undertale + AUs
119 stories
Bonerable (Gaster!Sans X Reader) by MartiNikx
MartiNikx
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The barrier was lifted, the monsters were free but not accepted; hell broke loose, the wars were resumed. The monsters had no choice but to retaliate to the human's advances. Resources were scarce, the earth seemed unhabitable and the only way to survive was through violence. You lost all hope when you were forced to comply to such vile doings; being left alone by your family loosing them to a friendly fire during an escape. You were all alone; until he came along. ☆Violence, Cursing, Sexual Themes☆ ☆Gender-Neutral Reader☆ ☆Slowburn☆
Princess of the Underground (Gaster!Sans x   Female Reader) by Nellie_Cake25
Nellie_Cake25
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[Y/N] lived with her adoptive mother Toriel for a while. How long is that? About three years. Throughout the time, the monsters in the Ruins know her as if they were her siblings. Flowey became way nicer each day around her, losing his soulless behavior. He cares about her so much he promise to protect her. All was well... Until she sneaked out of the Ruins. Going from Grillby's to the Librar(b)y, she went around having fun. Laws did apply, 16 being the age to leave past curfew, 18 being the age to finally date, and 21 to legally marry. One day, I slipped from my own mouth of the presence of a Princess... And Asgore ordered the Royal Guard to break the door to the Ruins... (Cover art made by Zayn-Inverse on DeviantArt)
My Precious Flower (FloweyXReader) [DISCONTINUED!] by ThePurpleRabbitog
ThePurpleRabbitog
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This is my first book. This story is about the flower that you find in the beginning of the game Undertale. His name is Flowey. Enjoy :3
(Drop Pop Candy) Papyrus x Reader by JessaDOVAKIN
JessaDOVAKIN
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An Undertale fanfic
All Tied Up (Error Sans x Reader) by EpicMaster2357
EpicMaster2357
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> Your just a regular human that fell down the hole that supposed lead to the underground, you come across many obstacles and find yourself in much of a sticky situation, more or less your tied up. •IMPORTANT• Hello wattpad users, this is actually the first story I'm actually making. So I'm sorry if it's suckish or terrible, but it's my first try I'm sorry! Ahem.. Anyways... I'll try to update once or twice a week and if I ever forget, then....then... I don't actually know what I would do...but anyways enjoy!
Undertale Sans x Reader One-Shots! by xXxDjwolfxXx
xXxDjwolfxXx
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Basically the title says it all. Give me a request and I'll write it! (I got nothing better to do with my crazeh life anyway...) Aus I know: Underfell Gaster!Sans Outertale Underswap Scientist!Sans And many more but I'm 2 lazy 2 type :p
-Old Friends-    Ink Sans X Reader X Error Sans by Kim__chan
Kim__chan
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You've fell into a dark hole and met Flowey, you and Flowey acted like enemies and you wanted to be friends. You met Toriel and had to leave, but you hated your life in the surface. You ended up in the snowed woods and heard kids playing, but you were cold as HELL. You rubbed your hand for warmth but it created a (F/C) flame.
Aftertale Sans x Reader by UndertellSwasterSans
UndertellSwasterSans
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This is for those who think aftertale sans is either hotvor adorable.
Dancing Into Tomorrow//Dancetale by GuinniDay
GuinniDay
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He had given up. He didn't care about what was happening around him. He didn't care about dancing anymore. He hardly cared for anything now. But secretly, he cared too much.