Gaster Stories

Small warning if you don't like the ship Gaster x grillby don't read Also no sex scenes or anything sooo yeah Also might be one of those ones that I work on when I can'...

When Sans first defended the lone human that fell, Kolton, he didn't expect for his scientist of a father to take care of him . . . nor the boy's two older siblings, War...

The reader wakes up to a new life as a monster skeleton. In a new world, that's filled with monsters, humans, and magic. But instead of living their new life to the full...

You have fallen in the underground. Find a way home.

"What's that look for? Are you perhaps unhappy to see me?" "Oh no. Oh no, quite the contrary, my love. I've craved to be with you for the longest time&quo...

Join the crew on various adventures ranging from mundane lounging at home, unleashing the beast in Among Us, and ruining friendships in Monopoly to epic quests, journeys...

Sans knew he wasn't like them... he was never one of their kind in the first place. Just an imposter. It was only time until his past came to bite him and they found o...

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...

Sans but cute girl. been thinking of that for a while now. Sans has been a lazy, laid-back girl her whole life. She's not interested in relationships at all, because sh...

Extra Scenes from "It's a Beautiful Day Outside..." If there's a particular scene you would like to see, let me know and it shall be so. The unofficial sequel

What if our favorite knuklehead ninja goes to Undertale multiverse, become a monster, and has gamer system? This is my first story.

I decided to do an ask & dare with my AU, Staintale. Staintale is a AU where Frisk and Chara are controlled by the player, Chara, Frisk, Flowey, and Sans all remember re...

It's the roaring 20's! You're alive and well and living great in your little apartment, which is always well kept, clean, and absolutely yours! Rent's cheap and the prot...

When the young, emotionless,and former bodyguard of willy tybur ends up on the wizard council and meets the royal scientist known as W.d gaster and feels feelings she's...

💀💀💀Ft. : W. D. Gaster, Papyrus and Sans🖤❤💙 ask the three Skeletons from Undertale anything as long as it ain't... 𝐒𝐔𝐒. I say this with every Ask book I create

In the midst of Tokyo's bustling streets, you led a life that appeared ordinary, despite your role as a leader in a prominent gang. Yet, beneath the façade of normalcy...

[[A/N]] THE PROLOGUE WAS ORIGINALLY AN ENGLISH ASSIGNMENT. EXPECT LOW ASS UPDATES 😭 BECAUSE OF SCHOOL AND THE OTHER STORY. | | | 🌟⭐️✨️ | 🌙🌕 | GenderDream...

Geno has a breakdown after another failed attempt at convincing the Sans in the current timeline to erase it and starts sending attacks all over the Save Screen. Unfortu...

You and your sibling, Frisk, have been living in a forest near the city for about four years now. Your daily routine has been unwavering since you moved here. Each day...

Monsters weren't always living peacefully with one another underground and the humans didn't always have such a vendetta against them. There used to be a hierarchy that...