Underswap Stories

Yeah sorry gained an idea on if someone became swap Gaster Also they may be apathetic or just confused on their feelings and MAYBE Autistic, I may be a bit wrong on ap...

A magical story between Dusttale Sans and Underswap Sans. Where Dust finds Blue to be cute, and starts to hang out with him, while Underswap Papyrus thinks that he's a t...

Just some yaoi thing that ran through my head like all the other yaoi and thought "Hey... this would be a damn good book..." Anyway, description, I'll try my b...

this Is a story where you Can choose what happen in the end so be aware of that ^^

What if someone from our world became papyrus from underfell? Well certainly things won't be staying the same of course. (Differen thing happening including personaliti...

Oh wow another chapter! 80

Sans (Swap AU) has been his cheery self for who knows how long. Then one night, Chara trips over a weird box the annoying cat dug up in an echo flower bed. There was a s...

Darce got reincarnated into her favorite game which is Undertale... but she didn't expected to be mad scientist which is Gaster and different one!!! But this Gaster is G...

Dream struggles to find a reason, a reason to live. Because what is there to live for when your brother hates you?

(I DO NOT WRITE ABOUT UNDERTALE ANYMORE SO PLEASE DON'T REQUEST ON MY CHAPTERS) (AND FOR THE LOVE OF GOD STOP COMMENTING ABOUT MY GRAMMAR, I AM SWEDISH AND I HAD A HARD...

This is an Undertale book Criminals have always littered the streets causing a mess and breaking the law. But what happens when criminals Fall in Love? This includes all...

Humanity is divided over one thing---the Monsters' reappearance. Some believe that they should stay aboveground, and others think that they should be sent back to where...

Bitty! US pap x reader x Bitty! US sans Our two little bitties have been through a lot, so what happens when they meet a human that's hurting just as much as they are...

Y/n L/n. A special human with a special SOUL. Yes, her Soul Trait is something new. But other than her SOUL trait she has another secret. One day, while she was at the...

So harem book of Charas and Frisks x male reader but real description is below this. The only one of his person in all universes is part of Undertale with an OP powers b...

I found this pictures on deviantart,pinterest,google and Frans Amino

What if someone is reborn as Error? What if they aren't so bad? What if they're suffering in silence and keeping their job a secret for fear of hate? How will Ink react...

This story takes place after the player vanishes from their fight with the bad time trio aka Sans, Shift, Stretch. The three got stuck there for a very long time until a...

**PLEASE NOTE** -Cover art does not belong to me, I will only take credit for the stories, I do not take credit for characters. -I will not do any lemons -This is my fi...

What if someone became papyrus from underswap? What if they gave their brother more freedom? What if they were the one that error kidnapped instead of sans? (Things wil...