1 - 20 of 33 Works in Siren Sans (Undertale)
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A collection of Undertale UTMV one-shots and small drabbles that I don't want to make entire stories for.
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You had always had a fascination with the water, something drawing your like a moth to a flame. Your sense of peace being time spent on your favorite beach with no one around.
Sans didn’t know what kept drawing him to watch you, but something drew him to you like a little fish to the lure of an angler fish.
While this is labeled as a reader insert fic, that is mostly due to the second person writing. The MC can be counted as an OC at this point.
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Lark came to the aquarium as a pup. He didn't know who or what he was before his life here in captivity. In his blissful ignorance he grew among the humans that cared for him, the crowds that came to see him. Being a lesser siren, his songs soothed rather than tempted, his instincts not strong enough to produce more than ease and healing upon those who heard him.
It's what had made him so popular.
His tank was open to the air, shallow near the glass where humans of all ages would stand waiting to hear him. Waiting to get splashed on the outside portion of his enclosure. On the inside, it was sealed and sound proof, his songs reserved for those who paid the most to get outside. He didn't mind it. The extra profits meant extra food for him, and good quality water. Or that was his limited understanding of how things worked in his very small world.
Small but comfortable. Till everything changed.
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Astr has worked at Ebbot Aquarium for a while now. He's been named the siren whisperer almost murdered and had beef with the higher ups.
Now a group of skeletons from another universe get transferred into Astr's universe and he has to balance them his sirens and the ever looming higher ups of Ebbot Aquarium.
Because there is something rotten under the surface of the aquarium. Why were intelligent creatures caged like mindless beasts? Why did Skull leave you gifts whenever he could? Why was Sans so aggressive? So many questions and Astr intends to get the answers to them all.
- Language:
- English
- Words:
- 2,330
- Chapters:
- 1/?
- Kudos:
- 2
- Hits:
- 21
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You spend most of your days at Ebott's aquarium. Not just because you particularly loved marine life, but to spend time with the ones you felt truly understood you.
Sure, they kill people every other week, but to be fair..
You'd probably do that too if you were kept within a glorified glass box.
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Flash Fics for Mimicry by Mochimunchies for Mimicry_Grievous
Fandoms: Undertale (Video Game)
30 Jun 2025
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A short collection of flash fics/oneshots written for Mimicry!
Includes:
Chapter 1 - Afterdeath + FatalDeath (Mer + Betrothal AU)
Chapter 2 - BEI (Mer AU)
Chapter 3 - Kustardberry (Mer AU)
Chapter 4 - Errink (Mer AU)
Chapter 5 - Killermare (Mer AU)Series
- Part 11 of Flash Fiction Giftfics
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A short collection of flash fics/oneshots written for Potatato4!
Includes:
Chapters 1 and 2 - Crosscentric (Witcher AU)
Chapter 3 - Scifell (Dr. STONE AU)
Chapter 4 - Goth and Palette Rollercentric (Mer AU)
Chapter 5 - Afterdeath + FatalDeath (Mer + Betrothal AU)Series
- Part 10 of Flash Fiction Giftfics
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Despite the rising prices, your mother was as kind as to buy you a ticket for a really neat Cruise. What you didn’t expect was for it to be your downfall.
From jealous orcas, to annoying sharks, to the calm and eerie cephalopod sirens. Will you make it back to land?
Series
- Part 1 of I Wanna Cry
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InfinityTale by AnAuthorYouSay
Fandoms: Undertale (Video Game), 无限暖暖 | Infinity Nikki (Video Game)
10 May 2025
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Aria had been happy her with life.
And then Nikki came. Nikki, with all the best intentions, brought trouble with her.
However, if she hadn't, Aria never would have met what she once deemed "divine punishment".
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After loosing a few family members to drowning, you learned quickly to stay away from the water. It’s trying on your constraint when you finally get your big break painting job, at the biggest, most famous aquarium in the world.
You’ll paint your seahorses in silence, thanks.
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Or, Reader (Transmasc) gets the opportunity of a life time to paint murals in Ebott Aquarium, the only aquarium in existence to successfully house sirens. And he’s about to find out why they’re so short staffed.
(MERMAY!! But really this will probably take me like a year to finish lmfao)
Series
- Part 7 of How To Be A Human Being
- Part 5 of I/Me/Myself
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Flash Fics for Suckyusername by Mochimunchies for Thisisareallysuckyusername
Fandoms: Undertale (Video Game)
05 May 2025
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A short collection of flash fics/oneshots written for Suckyusername!
Includes:
Chapter 1 - Errink (D&D AU)
Chapter 2 - Horrormare (Mer + Royalty AU)
Chapter 3 - Afterdeath + FatalDeath (Mer + Betrothal AU)
Chapter 4 - Crosscentric (Witcher AU)
Chapter 5 - Star Sans Poly (StreetRacing AU)Series
- Part 7 of Flash Fiction Giftfics
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Flash Fics for Whittney by Mochimunchies for WhittneytheScorpionSuccubus
Fandoms: Undertale (Video Game)
20 Apr 2025
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A short collection of flash fics/oneshots written for Whittney!
Includes:
Chapter 1 - Errorberry (Mer AU)
Chapter 2 - Bad Sans Poly + Star Sans Poly
Chapter 3 - Errormare + Errink
Chapter 4 - Horrorlust
Chapter 5 - CrossmareSeries
- Part 4 of Flash Fiction Giftfics
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Flash Fics for Hajime by Mochimunchies for Hajimeisamazing2020
Fandoms: Undertale (Video Game)
20 Apr 2025
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A short collection of flash fics/oneshots written for Hajime!
Includes:
Chapter 1 - DestructiveDeath + Errormare
Chapter 2 - Dadmare/NM Gang
Chapter 3 - Star Sans Poly + Error
Chapter 4 - Kross (Mer AU)
Chapter 5 - Errink (Fantasy AU)Series
- Part 6 of Flash Fiction Giftfics
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Summary
Your ‘work’ was unusual, to say the very least. Not many people you know got to say that they got to intern at the one and only Ebbot Aquatic Rehabilitation Center! The Ebbot Aquarium was on its own known to be one of the most prestigious aquariums around, and was incredibly difficult to land a job in. Needless to say the aquarium valued good work and only the best quality when it comes to their wonderful menagerie.
The Aquatic Rehabilitation Center was no different, in fact it was known to be of an even higher standard. It wasn’t even open for visitation, yet it was still so pristinely kept and cared for in a way that would make one think it was on display as someone’s most prized jewel.
Well, the Ebbot Aquatic Rehabilitation Center did indeed have some prized jewels of its own, and you were one of few people who had ended up on the team working with them. How exactly you got to such a rank as only an intern was beyond you, and the most you could guess was plot protection. But, plot protection or not, you had work to do. -
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A little spot for my shameless Sans x Reader oneshots and momentary inspirations to gather! Particularly, of the magical kind. Nagas, sirens, winged monstrosities, cursed creatures, fantastical beasts of all shapes and sizes... maybe even a normal skeleton once or twice, if you’re lucky! Canon is a speck in the rear-view mirror and we're all just here to have fun.
So just sit back, relax... and enjoy the mess that is me being totally self indulgent.
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To become one with nature. It would be a dream come true, if not for the dangers that lurk beneath the waves. How deep does this ocean really go?
(summary might change) (please read the tags and warnings)
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After an incident at the world-famous Ebott Aquarium, you find yourself placed on a team of staff dedicated to the care of the prize exhibits at the facility; three notoriously aggressive skeleton siren monsters captured in the name of 'research'. An orca with a disturbing record of finding new ways to attempt to drown his keepers, a shark who's excellent at removing whatever stray hands come his way, and a deep-sea octopus whose past (and body count) are hidden behind endless stacks of legal papers. Despite their pattern of brutally murdering their ever-changing team of keepers, they all seem to immediately take a shine to you- a worryingly bright shine. A shine that won't go away, a shine that starts to unnerve you.
However, the longer you work there, the more you see the inner workings of Ebott Aquarium. The more you realise the sirens you're 'caring for' aren't dumb beasts, they're deeply intelligent... they aren't mindlessly aggressive, they've gone insane, locked in those tiny glass cages.
... The more you interact with the sirens... the more you realise their murderous aggression might not be all that misplaced.
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Your life couldn't have gone so...Off the deep end...
Despite years of experience and a degree in Marine Biology, you ended up doing janitorial work for one of the biggest, most impressive aquariums in the country. You didn't consider it too unlucky, but boy was it awful. You had hoped to maybe achieve your dream as one of the marine trainers for the animals, but you assumed your resume was...overlooked. Now it's just you and the mop. Well, was you and the mop, 'till you came face to face with one of their notorious new additions to their Siren exhibits.
You knew the dangers; you studied them in college. Yet, your little dream of really being close to a Siren, a skeletal Siren even, was enough to let you look over their murderous track record at New Ebott Aquarium.
You weren't expecting them to like you just as much.
Now it was sink or swim! You were promoted in practically a night to a Siren caretaker and learning how to care of these magical beasts. You had expectations to meet; everyone believed you had some special way with the Sirens. Maybe you did? You could only find out further by getting your feet wet!
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BELLADONNA (old, being rewritten!) by spitefully_perfect
Fandoms: Undertale (Video Game)
18 Apr 2024
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There’s something so humbling about the ocean- maybe it’s the open expanse that makes you feel so small, or maybe it's the knowledge that otherworldly life exists in its depths. Depths humans were never meant to see.
Depths from which people found the most unusual creatures, and put them on display for all to see, in fancy aquariums of only the highest quality for their aquatic menagerie.
That's how you ended up at the aquarium.
Sirens.
The Ebbot aquarium had sirens.
And who were you not to be curious?REWRITTEN !! New fic focuses more on Lust but don’t worry, tge boys here will show up eventually!
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The Heir of Neptune (Platonic Siren Sans x Young Reader) by orphan_account
Fandoms: Undertale (Video Game), Ancient Roman Religion & Lore
30 Mar 2024
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Y/N L/N has a secret.
She is the daughter of one of the most powerful deities in the world. In a world where many beings practice magic, she should be welcomed.
But she's not.
Humans are only supposed to have abilities based on their SOUL type. A human with magic? Impossible.
In an accident, she's found out. She's taken captive.
Now she's stuck in an aquarium, considered an animal, and has to fight so survive against the aquarium's previous attractions, as they might not be as friendly as she'd hope.