Undertale
73 stories
Eyes of Fire (Gaster!Sans x Reader) by pst_writes
pst_writes
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(FAN FICTION BASED OFF OF VIDEO GAME 'UNDERTALE') His eyes were like fire. Amber. Dangerous. But they intrigued me. The flames of his soul danced and encased my heart. It was needless to say that I didn't mind. (COMPLETED)
Blown Through The Rift (Gaster!Sans X Reader)  by BanthaBug
BanthaBug
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You were working with Alphys in the lab in Undertale when chaos strikes! In a freak accident, concentrated determination is mixed with an unnamed concoction and blow you through a dimensional rift. When you reawake, you find yourself in what seems to be the beginning of Undertale once again. Upset but not overly surprised, you make your way back to Alphys's lab... Only to find her lab assistant is no longer you! Working with Alphys now is a tall, punkish skeleton with two cracks in his skull and a snarky attitude. As they help you find your way home, will you find more than that? *I DO NOT OWN UNDERTALE OR GASTERTALE!!! I WISH I DID BUT I DO NOT! THIS IS JUST A FANFICTION!!*
So This Is Determination {Frisk x Sans} by gracemar100
gracemar100
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Sans. A monster with a skele-ton of puns up his sleeve. Frisk. A human girl who fell down into the ruins. Toriel. A mother figure for Frisk. Papyrus. Sans's younger brother who loves spaghetti. This. A story about them, and more.
UnderSwap Sans X reader by Kawaii_Blueberry
Kawaii_Blueberry
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    Parts 36
Why, Hello Human! This book used to be..not as great as it is now! It's been a while and I have finally finished my puzzles. There's no way you can get through them now! Mweheheh! Author: Heheh-Hey, Guys! This book was awful back then. Just forget about those awful chapters in the beginning. The chapters now have improved. I hope. But, yeah. I'm still finishing this unholy book. Welp, See ya!
Underswap Sans x Sad! Reader by AuthorBlitz-Chan
AuthorBlitz-Chan
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Here's some more Blueberry love for the fans out there!
No One can have you but ME (Yandere Underswap!sans x reader)  by fanficmaster232
fanficmaster232
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Not every one is what they seem. to learn this after falling into mount ebot and meeting papyrus and his brother, sans. or as you call him blueberry. you become friends with blueberry and hang with him often. but little did you know that blueberry wanted more then your friend ship...
Undertale lemons by 2DocIsLife
2DocIsLife
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Any type of lemon from Undertale all the way to error!tale (can't believe that I am about to do this)
Darn Hot Skele-Guy...  [[:]] Gaster!Sans X Reader [[:]] [D I S C O N T I N U E] by -non_existent-
-non_existent-
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I.. I don't know why I'm writing this..
After Dark An Gaster Sans X Reader by unlivinggore03
unlivinggore03
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This is from the readers point of view. You don't know where you came from. You don't know where you've been. You don't even recognise yourself. You're lying in the street whilst it's pouring it down. Your hurt and alone. Your clothes are in even worse condition than you are. You feel that your going to die there. Until a short, joking skeleton named Sans, Invites you to come and live with him, and his brothers.
Dear Demon(Gaster!SansXReader) by SansationalUsername
SansationalUsername
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    Parts 22
You woke up, it was monday. You were going to your wardrobe to change your clothes... But there was no wardrobe. You was in a decaying dirty couch, in the middle of nowhere. You forgot that your house was burned to the ground by some human-hating monsters, while your family and friends were there. And you watched them burn, crying but powerless, hearing them shout for help. It was the seventh time you made that mistake, so you was so depressed you didnt want to get up. It was like this for a pretty boring and depressive time, until something happened. Or should I say, someone happened? Fanfic inspired by the music My Demons, by Starset