Undertum Stories

an nightmare sans undertum story,(horror x nightmare)

it has fontcest but only slight 18+

I've noticed a lack in Undertum and Inflation stories, so here's a collection I will work on every once in awhile! From inflation to weight gain! Edit: I'm probably goin...

Frisk has grown up now and moved away to the big city to attend college. She misses her monster family, especially Sans. He comes to visit her one day and suddenly, some...

your baker mother Muffet, your chubby you, and big "bad" Betty, all in one story that ends well! (art belongs to really-normal)

Betty spends the weekend with Toriel and learns that trying to murder Frisk isn't needed for a happy mind and that a sweet alternative is coming (cover belongs to Nommer...

A small little place for Rping weight gain. (Credit to Chub-Love-Fics on DeviantArt for cover.)

I just put some undertum storys I thought of in here, it's that simple. I hope you enjoy this book though.

..... i made a wattpad account for this....Merry Christmas...

Mainly what the title says. Lots of Sans, ton of SANS, Undertale sans, undefell sans, ALL THE SANS. BUT WITH A CHUBBY READER. WHHHAAAAT I KNOOOOW. READ FOR THE FLUFF...

Toriel gets lonely, wishing the humans didn't leave her so she eats herself into obesity.

After so many meals and so long of being fattened up.... this is the only way it could end

Toriel stuffs frisk

I just found out this was a thing and I have done a lot of research for this so now I can write a fanfic!!!!