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...

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...

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...

Somehow...I've become a sans...and not just any sans.. I'm classic!? What the flip is going on!? Wait why are different sans and papyrus's showing up at my home? I didn'...

Nightmare found a young child a long time ago. When they fell into a coma it sent him over the edge. several hundred years later the child wakes up in a castle of darkne...

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...

(m / n) (L / n) is a 19 year old boy and he is frisk's cousin, (m / n) always looks after frisk like his own sibling because since childhood frisk has always been treate...

The tale of how Sans became who he is known as: From a human girl with a Nuetral Soul to a skeleton. But most importantly a big brother. Picture by: BonesTheSkelebunny01

Bad Time Trio meets BNHA Disclaimer: I do not own BNHA, Or Undertale, or any of the AU or any of the pictures showed

I don't own any of this besides my plot and extra characters.

[Previously known as "But He Never Showed It"] Sans has been hiding something lately.. Will Papyrus figure out what's really been going on before it's too late...

This is a story before the last human fell around the time Chara was still alive and well. Humans were not being hunted till the adopted prince's passing, however with a...

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[^w^;] So... New description and cover art! Yay! Ok, let's go! "What's the point in existing, when you're worth nothing?" We all know that the Underfell...

Everybody sees the bright and magnificent Sans as a happy soul. He's constantly smiling and boasting about himself, and is inclined to deal mercy to anyone, even his ene...

[COMPLETE/PLUS EPILOGUE] Blue has always been the happiest and the most kindest to everyone, barely ever frowns at all. However after having a werid dream about a huge...

Sans is heading to a new home. An apartment in a complex called Pink Palace. At first Sans was excited meeting all these new faces and seeing all these new places until...

❝ Long Ago, Lived Monsters, Humans, Mages, and Dragons. All living in peace. Until humanity decided that Monsters, and dragons weren't meant to thrive in peace along wit...

I DID NOT MAKE THIS AU OR ART! This is a buttontale fanfiction! Please don't judge (-_-'). Also...this will have slow updates until I finish my other books. This is a dr...

"There IS worse fate than death" The cover isn't mine. Just a few warnings: -boyxboy -girlxgirl(maybe?) -blood -su¡cide(kinda) -death