Undertum Stories

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14 Stories

fatting the boss by ASAPPYSHIPPER
fatting the bossby A SAPPY SHIPPER
an nightmare sans undertum story,(horror x nightmare)
Undertum one shots by Inflationist162
Undertum one shotsby Inflationist162
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...
Completed
Cold Winter Day | Weight Gain by noodle_baby_
Cold Winter Day | Weight Gainby beans
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...
baker mother and feeder girl (Betty Noire X chubby reader X mother muffet) by the-dude231
baker mother and feeder girl (Bett...by the-dude231
your baker mother Muffet, your chubby you, and big "bad" Betty, all in one story that ends well! (art belongs to really-normal)
Betty's big weekend by the-dude231
Betty's big weekendby the-dude231
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...
Weight Gain Rps by CrazyGlacey
Weight Gain Rpsby CrazyGlace
A small little place for Rping weight gain. (Credit to Chub-Love-Fics on DeviantArt for cover.)
Undertum Story book by IcyJackie
Undertum Story bookby IcyJackie
I just put some undertum storys I thought of in here, it's that simple. I hope you enjoy this book though.
Secret santa gift by chubblegum25
Secret santa giftby Chubblegum
..... i made a wattpad account for this....Merry Christmas...
Completed
I love you a skeleTON ( sans x chubby reader) (discontinued! Sorry!) by SierraColor
I love you a skeleTON ( sans x chu...by Sierra Color
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's tubbification by FatUndertale
Toriel's tubbificationby FatUndertale
Toriel gets lonely, wishing the humans didn't leave her so she eats herself into obesity.
Completed
Undertale Weight Gain Story by FatUndertale
Undertale Weight Gain Storyby FatUndertale
After so many meals and so long of being fattened up.... this is the only way it could end
fat frisk by FatUndertale
fat friskby FatUndertale
Toriel stuffs frisk
Undertum fell sans X Reader by Bluefurjamaa
Undertum fell sans X Readerby ✨Bridgette Steves✨
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!!!!