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After receiving an impossible project from the Royal Family, your scientific collaborator and partner, Dr. W. D. Gaster, has been obsessing over his work and running himself ragged. A particularly late night leads you to taking some initiative in the situation, and you end up staying the night with him, where both of you get some much-needed rest. The next morning, facing two entire days off from work, you two find ways to keep busy.
- Language:
- English
- Words:
- 4,092
- Chapters:
- 1/?
- Hits:
- 16
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Monsters and humans have always been so innately different, that was one thing both species could agree on. As such, there was a severe lack of research on humans, their bodies and how they functioned, their emotions ...
It was so hard to find a willing human, so why should Gaster have to?
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A certain doctor steals you from your comfortable, average life without warning to run experiments on your body. It's for the greater good of education and knowledge, so why are you so upset?
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"Traumatized people chronically feel unsafe inside their bodies: the past is alive in the form of gnawing interior discomfort."
-The Body Keeps The Score, Bessel van der Kolk
Dr. W.D. Gaster is not a happy man...but he had been, once. Perhaps he could be again.
...and he can't stop thinking about you. Can't make himself stop thinking about you.
A story in which love, quite literally, saves the world.
(Now in Arc 2)
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You're an engineer who works for Ebott's best research facility in one of the labs; your lifelong dream after finding a journal on Mount Ebott when you were a kid. When you aren't in the lab being smart, you're gathering materials at the abandoned doll factory for the machine you're trying to build.
But one night, you meet a skeleton at the factory. Naturally, you lie about why you're there and say you're there to hunt ghosts. You befriend him and try to find a way to gather the materials while keeping up with that lie. But those lies catch up to you when you start to meet all the other skeletons.
Edit: As of Chapter 29, all chapters have been edited and fixed slightly!
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My hummingbird (W.D.Gaster/Reader) by OMGwhyamIadegenerate
Fandoms: Undertale (Video Game)
27 Aug 2025
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"Ladies and gentlemen, please welcome our queen of the opera, Y/N!"
The noise, the magic, everything making your heart fill with emotion and your body shake with excitement. This is your life.
About 10 years ago, the monsters from the Underground were freed. Unfortunately, the hope of pace was quickly buried under the shadows of the mafia. The human mafia king and the monster mafia king, king Asgore, formed an alliance, covering the shadows with eyes, ears, and fear.
You are a 28 years old opera singer, the best at your job. This is your dream and love, music. Since a child, you fought your way up, alone. But one night, you feel another type of magic, one you never felt before. Your new bodyguards, the skeleton family, intrigued you with their mystery, especially the man named Gaster.
This time, you won't sing a story nor play a role, this time, you would truly feel the power of the most dangerous magic, love. -
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It had to have been the humans. An attack, disguised as a friendly visit and the sharing of information. An attack on the Dreemurr line's most valuable cousin, the Lord High Engineer.
But it's too late to worry about that, now. Too late to worry about your reputation amongst the bigoted human nobles, your livelihood as an official and civil servant, or his anger when he realizes what happened...
Your Lord has been drugged, and it will burn him alive if you don't do something.
Series
- Part 1 of Crown and Scepter
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i have no excuses but i do have a piece of fanfiction in which w.d. gaster literally just swallows you whole and it’s honestly not too bad of an experience
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It's rumored that the monsters living on the other side of the city grew feral in their isolation underground... But none of that seems true to you, so you decide to visit Downtown anyway. Unfortunately, just like with humans, a few dangerous groups do exist, and your encounter with one lands you in the care of Dr. W.D. Gaster. To avoid political issues, you're secretly kept in his care for your entire recovery process, during which some interesting things come to light. For one, your doctor is a huge nerd, just like you are. More concerning, though, is the development of his thirst for your blood...
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you rape gaster :THEKING:
- Language:
- English
- Words:
- 408
- Chapters:
- 1/1
- Kudos:
- 1
- Hits:
- 82
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Two people of completely different backgrounds and ways of existence die at the same time, in almost the exact same manner. Due to a grand, universal, mathematical error, they are now forced to live out their lives sharing a single consciousness and body. For the first time, someone is able to understand his speech. For the first time, someone is able to understand things from her perspective. Initially spiteful and overly bitter to one another, they grow attached to each other's company. What would happen if they die? How much does someone have to contribute to be deemed worthy of respect and understanding?
A commentary on loneliness and the plight of the foreigner.
A love letter to the fanfics I have read, connected with, and grown to love.
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(Female black insert. This is also based in the 1920's so there will be aspects of racism and discrimination.)
You were one of the more notorious mafia families in your area, when suddenly you are attacked by three monsters. They take everything from you, your home, your family, and your power. Forced to retreat to a smaller town with the remnants of your gang you slowly work toward revenge. During this time you run into your one of your attackers, Sans. He takes a liking to you, it makes your blood boil. He refuses to kill you even though you were supposed to die in the attack. Why is this? And what will come of the dynamic with his power over you?
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It was dark.
It was so, so dark.
The only thing you could see was a red glow, around a sea of dark mumblings.
Until a voice reached out.
"So we meet again." -
Gaster and the Manic Puppeteer (... In the void where he resides at.) by AsillyAO3reader
Fandoms: Undertale (Video Game), The Stanley Parable
15 Aug 2025
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Gaster meets the Manic Puppeteer he's heard so much in news articles (who controls me, the writer, and a gachatoker)
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You fell into the void. It hurts to understand the man that speaks in a broken and foreign language. Literally. Your head feels like its about to be split open every time that man speaks.
or, a reupload of sanctuary because I accidentally deleted it and I am far too stupid to use ao3.
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Yeah, it was a good day. Sun was shining, birds were singing, and all in all, you were ready to get to work and stretch your creative muscles.
Of course, you should have thought it wouldn’t be that easy. Some mornings started hard, and ended easy. Some started easy, and ended hard. But they almost never started easy and ended easy, and today was going to test the bounds of your patience like nothing ever had.
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12 Skeletons, 3 Ghosts, 2 Harems, And A Gamer by syst3m_of_3rr0rs
Fandoms: Undertale (Video Game)
10 Aug 2025
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You're thrown into the world of your favorite fandom/game where you end up living and interacting with the most cliché storyline in the entire universe of anti-harem fanfictions.
That's it.
That's all it is.
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Ever wonder what it's like to live in the world of your favorite fandom with your favorite characters? No? Then this book ain't for you. But if you have, then strap on in and enjoy the ride guys, gals, and nonbinary pals, cause this is gonna be the adventure of your life!
(WARNING: Slow updates, [probable] short chapters, major chapter editing. Also, some characters might be a bit OOC.)
Previously titled; "It's sad, I'm sad. I miss you. How did this happen?"
Series
- Part 3 of Undertale Stories
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Our sweet honey by BurningToTheBone (ShadowStory900), ShadowStory900
Fandoms: Undertale (Video Game)
08 Aug 2025
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After a long time of planning you thought you were ready to adopt a little roommate but nothing went as you had planned, no bitty really caught your attention or they didn't seem interested in you.
What kind of bitty was he? How were you going to take care of a colony of them? And more importantly, why were they looking at me like that?
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Reader and WIng Gaster the royal scinetsit are tigether orever they are dating and Gaster send you lover leteter wehiles hes ay work
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The Scientific Method by ThePUNisher
Fandoms: Deltarune (Video Game), Undertale (Video Game)
31 Jul 2025
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You are a massive fan of theory crafting videos. While you weren’t as preoccupied with them when Undertale came out, you’ve matured enough to find the beauty in them once Deltarune started coming out. Following the release of Chapters 3 & 4, you decided to get your hands dirty and examine the game for yourself in hopes of finding your own meaning. However, as you start up the game, something very, very interesting happens. What follows can be described only as a once-in-a-lifetime opportunity that melds the boundaries between fiction and reality.