12 Works in Sans (Undertale) is From Deltarune
Listing Works
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Crawl Back to the Grave by Mystii_Gur0
Fandoms: Undertale (Video Game), Deltarune (Video Game)
25 Nov 2025
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Summary
Escape is useless.
Series
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They, with some Difficulty, Asserted Themselves by RennieTheDinosaur
Fandoms: Undertale (Video Game), Deltarune (Video Game)
17 Nov 2025
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Summary
As a result of the Roaring, the skeleton brothers find themselves making a move. One sees the opportunity for a fresh start, the other struggles to adjust.
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It's not raining here, so... by LostGirlDess
Fandoms: Deltarune (Video Game), Undertale (Video Game)
21 Sep 2025
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Summary
Much like his ability to remember erased timelines, the continuities that have been returned to the nothingness from which they came, Sans also hears the music that plays in the world. He reminisces on the first time he heard a track like this.
Series
- Part 3 of UT/DT Oneshots of Varying Quality
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Someone Really Cares About You. by Meowzerz_Oh_6
Fandoms: Undertale (Video Game), Deltarune (Video Game)
17 Sep 2025
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Summary
Sans Undertale struggles to adapt and move on while integrating on the surface.
The troubles of his past haunt him, the burden of his old home, coming from a different world, being aware of resets, the trauma is all messing with his head.
He’s already fallen into depression and other darker thoughts.
Will he succumb into hopelessness, or will he realize that people care about him in time?
OR
What if Sans Undertale is actually from Deltarune? What will a man with such knowledge and burdens do? Will he stay determined? Or will he succumb into the despair that the universe threw one thing after another at him, as he tries to move on in a permanent happy ending.
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Papyrus was ten years old and had a head full of hopes.
Like every Tuesday, Sans worked at the lab with that weird doctor. And like every Tuesday, Sans was too busy to pick him up from school. This time, his brother also forgot to unlock the door before he left, which meant Papyrus would have to wait for his return to go home. Papyrus didn’t like the doctor. Month after month, he stole his brother a little more.
Who could have predicted that this ordinary afternoon would change his life forever?
When suddenly, a white dog.
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If I've Fallen From Hell, Then This Must Be Heaven by moramorum
Fandoms: Undertale (Video Game)
12 Aug 2025
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Summary
A certain green-yellow striped sweater donning individual has fallen into the UNDERGROUND. They are accompanied on their journey by a petulant voice in their head (no they are not going insane).
[Undertale, except Chara and Frisk have swapped places.] -
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Summary
A contradicting question Sans had never wanted to linger on, to contemplate, consumed his thoughts.
Would he be willing to leave Papyrus behind?
His breath caught.
Series
- Part 3 of Zine Contributions
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Apeirophobia: the fear of eternity; endlessness; the infinite.
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Giving up and starting over feel the same sometimes. It’s difficult for Sans to do either when he can’t let go of the past. It’s difficult for Papyrus to do either when he doesn’t know what that past is, even when it’s rearing its ugly head.
Papyrus’s attempts to stop Sans from lying end up rekindling an old Connection, for better and worse.
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it's raining somewhere else (salphys t4t amicable exes) by bellepeper91, friskybitz99
Fandoms: Undertale (Video Game)
14 Jun 2025
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Summary
A collection of stories, either following a timeline or veering away from it.
Alphys and Sans worked together a long time ago. They even dated once, and were madly in love with each other. Then, they discovered important parts of their identity, and decided to break up so they could pursue their true selves. They're in the middle of wingman-ing each other when an incident happens, and they decide that, for the sake of their friendship, they need to part ways. They don't forget each other, though. The romantics may be gone, but there's a stronger kind of love in its place.
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Papyrus didn’t mind the puns until he was a teenager, but by then, fate’s atlas was set— Sans just needed a new place to practice.
He finds it not long after opening the store. He finds a woman.
Or
Sans and the rain
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...Except you don't exist by WPuppetMar
Fandoms: Deltarune (Video Game), Undertale (Video Game)
13 Feb 2025
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Summary
Testing an interdimensional travel machine, Gaster makes a connection with someone from an alternate dimension. However, upon bringing his friends into his own dimension, he falls into his creation and shatters across time and space...
Years later, said friends hear him through an echo flower, which prompts three determined followers and a hopeless kid to contact him, leading to several shocking revelations.
(Inspired by Oblivion Theory by @wandydoodles on twt)
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"You'd better jump in at least 1000 puddles for me!!!" -Undyne phone call
In Waterfall, That-Sans meets This-Undyne for the first time.
Series
- Part 40 of Undertale/Deltarune Tumblr Requests