1 - 20 of 4,569 Works in Grillby (Undertale)
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Summary
The Barrier is down, monsters are walking the streets, and reality just got a lot stranger.
Rhea is human, unprepared, and stuck in a house full of wildly different, unpredictable skeletons. Some are warm, some dangerous, all impossible to ignore. Pulled through a mysterious machine, she’s trapped under their watchful eyes while the multiverse starts leaking into her life.
Rhea navigates the household of chaotic, flirtatious, and often deadly skeletons, while trying to come to terms with her new fantastical, but very real reality.
Darkly funny, magically strange, and dangerously charming. An urban fantasy reverse-harem story about survival, trust, and learning to live among the bones. -
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Long ago, deep in the quiet woods of the Underground, Grillby sought only solitude. He never expected to find a fallen human woman-wounded, frightened, and far from home. Against his better judgment, he took her in. At first, it was duty that kept her hidden and safe from the Royal Guard. But when her laughter began to fill the spaces between his silences, protection became something deeper.
When word of her existence spread, Grillby made a dangerous choice: he marked her under his protection, binding her fate to his flame. Their bond grew-slowly, tenderly-but like the flowers she loved, her life bloomed briefly. And then it ended, leaving only memories and ash.
Centuries later, on the Surface, Grillby runs a quiet bar and tells himself he’s content. That is, until a new regular walks through the door - a woman with the same gentle voice, the same curious eyes. There’s something achingly familiar about her, like a dream half-remembered. His flame stirs, warmer than it’s been in ages.
But can love reignite across lifetimes? -
Scattered Souls by Eris_void
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
24 Oct 2025
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In the fight with Omega Flowey, when Frisk calls out for help and the souls answer the call, one does something unexpected causing a reset that brings all the souls back to life in the location where they drew their final breath.
Now, with these 8 souls lost throughout the Underground, they have to manage their way. Will they see the sun? Simply die in the pit once more?
Will the lost souls find what they seek?
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Undertale Kinktober 2025 hypnosis edition by Chris_ghosty77
Fandoms: Undertale (Video Game)
24 Oct 2025
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New kinktober! One chapter a day for the entire month!!! With a list I made myself, very excited to show everything I've written.
Just like the other ones every chapter contains some form of hypnosis/mind control/brainwashing. I'll do my best to tag but i can't tag absolutely everything so look at the warnings at each chapter or in the table of contents.Series
- Part 14 of Undertail hypnosis series
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Grillby has sex a human for the first time, and surprisingly doesn’t burn them.
(There’s a lot of typos that i don’t feel like fixing.)
- Language:
- English
- Words:
- 2,630
- Chapters:
- 1/1
- Kudos:
- 1
- Hits:
- 37
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Unexpected Hero by LemonCake64
Fandoms: Undertale (Video Game), The Legend of Zelda & Related Fandoms, The Legend of Zelda: Twilight Princess, Deltarune (Video Game), The Legend of Zelda: Ocarina of Time
22 Oct 2025
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“Not so fun being stuck in some loop right? Trying to fight to protect what ya got, not getting a choice in it. If I had the choice I wouldn't remember either.” The words oddly felt comforting. Link let out a slow breath, closing his eyes for a brief moment.
He didn't feel alone for the first time in a long time.
And that?
That was terrifying.
“To be honest, I kinda gave up a while ago. Just sat back and let the chaos go on, felt like nothing I did mattered anymore. Everything would just be reset anyways. Stopped caring what happened, that was until you showed up.” The skeleton’s eyes bore back into the Hylian.
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“Thanks, Paps.” Sans replied, taking the blanket and dropping it over the sleeping human. Proceeding to give the child an affectionate pat on the head. The sight made Papyrus think of when he and Sans were younger.
Seeing his brother in such a state filled Papyrus with his own feeling of euphoria. After all his brother has done for him, even including all the times he has annoyed him with the puns, Papyrus felt that Sans deserved his own bit of happiness. His own chance to have the life he wants.
Or essentially five times of others witnessing Sans acting as a Father towards Frisk, the one time he admitted it.
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The thing about soulmates is, no matter what pries them apart, they always...always find a way back together
Chapters 1-3: Prologue
Chapters 4+: Main Story
*Chapters set to auto release every Saturday!
*This is a rewrite of I Have The Power of Gaster AND Anime On My Side. Same concept, with a bit of a serious feel.*
**Please be aware that this is not like my usual reader-inserts!! This story is in 3rd person pov, very vague description of a female reader. Unnamed (Pet names only). No use of y/n, y/e/c etc.**
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Skeletwins Sans' diary.
(Note: I HIGHLY recommend reading the main Skeletwins story before reading this fic. Spoilers for Snowdin Adventures with the Skeletwins ahead.)
Series
- Part 14 of Skeletwins Side Stories
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Tails and Alphys love story by RisingTails
Fandoms: Sonic the Hedgehog - All Media Types, Undertale (Video Game)
22 Oct 2025
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Tails and Alphys start to notice something between them
- Language:
- English
- Words:
- 920
- Chapters:
- 2/10
- Hits:
- 26
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On the day of their 13th birthday everyone has a name appear somewhere on their body. A script different than their own, but still familiar and comforting nonetheless. It's said to be your soulmates handwriting and, when you make physical contact for the first time, it's to change to the color of their eyes. Or so the rumor goes. But everyone knows that's just an old wives tale since finding yours is so far and few between.
But then there's you. What the hell are you supposed to do with 12 soulmates?? At least your odds are better than most...
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Grillby didn't like dwelling on negative emotions. But it's hard not to feel them when a familiar skeleton comes back into his life.
Or
Gaster shows up at Grillby's after years of no contact.
[I promise my writing is better than this summary.]
- Language:
- English
- Words:
- 2,764
- Chapters:
- 1/?
- Hits:
- 20
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Dualtale AU: Two sides of truth by ED_Soul
Fandoms: Undertale (Video Game), Underverse (webcomic)
21 Oct 2025
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Description:
This story is based on the distant and little-known Dualtale AU,where nothing is as simple as it seems. In this world, unlike the original Undertale, monsters were never trapped underground. But what was the price for peace between humans and monsters? And how is it connected to XGaster, when these events unfolded long before the X-Event?
(Features characters from Underverse and Undertale,adapted for this story.)Author's Note:
In the Dualtale AU,the famous rule "Kill or Be Killed" is replaced by another:
"Speak out, and you will be silenced."
This is a universe built on lies and dark secrets that everyone holds.Every character has their own agenda and their own rules and it's better not to try and learn them.Series
- Part 1 of Dualtale AU: Two sides of truth
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Blood and Determination - Scrim sans' backstory by Ratking_mischief
Fandoms: Undertale (Video Game)
20 Oct 2025
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Summary
Just the backstory and history of my sans OC, Scrim (Scrimshaw).
- Language:
- English
- Words:
- 1,813
- Chapters:
- 1/?
- Hits:
- 7
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Summary
Gather children, listen well, harken to the Under Tale.
A story of a small child, falling into a massive cavern where monsters have made their home. With the help of a certain phantom, the child makes their way through the Underground, making friends & family along the way.
I own absolutely nothing in this. Undertale, along with with characters, setting, etc., belong to its respective owners, who are not me.
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Without History (maybe some things should stay forgotten) by Human_with_no_life
Fandoms: Undertale (Video Game)
21 Oct 2025
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Summary
After the barrier breaks, Monsters and Humans have learnt to live together on the surface, there is still many mysteries hidden in the underground. Most of them will stay forgotten or buried forever.
Until a ‘promise’ Sans made with Frisk leads to him telling a long and complicated story. His story, well not exactly 'his', but with as many questions as it answers, it seems to raise more. One thing is for sure; this tale will change everything.
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She had been stripped of her bravery a long time ago. She was so fearful of many things, but a pair of skeletons challenged her to change that. Y/n had to learn to be courageous as well. Otherwise, she would never see Sans again.
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Working at a bar wasn’t all that bad. Sure, sketchy people would show up, and sure, there have been some fights, but besides that, it wasn’t that hard for her to focus on her job. Of course, the only person who made Muffet’s shift bearable was Fell, who had become a regular.
This is an image roleplay format & podfic loosely inspired by Sooner or Later You're Gonna be Mine by Staringback ( A03).
So if you are a Frans shipper, I'm sorry, but adult Frisk will not be in roleplay. Muffet will be taking her place as Sans' love interest... DunkinDonut.
Please enjoy.
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After a quiet morning at QC’s Diner, everything goes wrong.
Kris, your long-time friend and neighbor, walks in acting strange, eyes empty, movements unnatural. In an instant, the diner collapses into smoke and shadow, dragging you into a world that shouldn’t exist.You awaken in a darker reflection of reality, a place where light fades, fire speaks, and kindness wears a green cloak.
With Grillby’s cryptic warnings and Ralsei’s comforting smile, you begin to navigate the mystery of the Dark World, searching for answers, and for Kris.But as warmth begins to bloom between you and the soft-spoken prince, one truth becomes harder to ignore:
You didn’t just fall into the Dark World. You were meant to. -
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As you walked you failed to hear the screams of terror of a bus going over 100 miles per hour and the sounds of it starting to bust down- it speeds near the sidewalk—the people in it shriek. Their blood curling screams didn’t occur to you, your headphone quality being way too good. Your shoulders relaxed as you stretched your limbs; very much unaware of the danger and pain that would very much make your life way more miserable. You should move out the way. But- likewise, you are unaware. Of death flickering and time excited to cut your strings.
The bus is almost out of energy- and has been stopped.
Or so people thought.
It began to tilt- right where you were very much slowly walking. Andddddddddd—
It didn’t crush you to death.