1 - 20 of 115 Bookmarked Items in Waterfall (Undertale)
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“I’m not here to stop you.” He stated flatly, hardly trying to actually convince him.
“Bullshit. Then why are you here?” The dust-covered monster interrogated him, completely done with his sporadic visits. But, instead of receiving a clear answer, he only got a shrug.
“What’s your favorite color?”Series
- Part 1 of Friable!UTMV
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"You never know." You shrugged and flopped down on the grass beside our oak tree. I lay down beside you, letting your arms drag me closer and wrap around my torso. Our chests rose and fell in tandem. Above us, the stars stretched far into the pure black sky. They seemed to be shining brighter than ever.
A series of letters written from human Spamton to monster Tenna leading up to the Human-Monster War
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DELTATALE: UNDERRUNE by J88888888
Fandoms: Undertale (Video Game), Deltarune (Video Game)
01 Sep 2025
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the fun gang get dropped into random spots in undertale
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Bookmark Notes:
Nice start, add kerdly.
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Bookmark Notes:
Chapter 2
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Sans would do anything for his brother, even more so now that they're lovers, but he's struggling with the restrictions that come with keeping things secret. Could Papyrus's proposal for a 'not-date' in public be what they both need right now?
Shameless super fluffy smut based on a conversation with @redtomatofan about sex in a waterfall... ;)-
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Darkners? How About Monsters! by WhatamIDoing_GoodQuestion
Fandom: Deltarune (Video Game), Undertale (Video Game)
08 Oct 2025
Summary
We all love our beloved darkners from Deltarune! But what if some of them were monsters who live in the Underground of Undertale? What if even if they lived there, they still can't escape the horrors?
Well why not take a gander!
(Mainly focusing on Jevil, Seam, Spamton and Tenna, but other darkners may appear)
- Words:
- 26,404
- Works:
- 4
- Bookmarks:
- 3
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The One Where They Walk Home by Whipple
Fandoms: Undertale Yellow (Master Sword Video Game)
29 Sep 2025
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Five times Starlo walked Dalv home to his cozy Snowdin cottage, and the one time Dalv returned the favor.
(In which two monsters, while walking home, neglect to realize they’ve already found home in one another.) -
CotLtale by Nekozaburo
Fandoms: Undertale (Video Game), Sky: Children of the Light (Video Game)
11 Apr 2023
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Summary
(Undertale and Sky: CotL crossover AU)
*Eye of Eden, all sky kids must go through it once in their life.
*But something went terribly wrong.
*Sky kids weren't returning from Eden, and no new children fell from the stars.
*No one wanted to believe it, but it must be true.
*Megabird had died.
*Years passed.
*Eden suddenly erupted.
*Raining down parts of its corrupted world, sky kids scrambled to get rid of it before they spread.
*But, they weren't enough of them to get rid of the corruption, and it spread more and more.
*Now, sky kids have lost their light.
*With no reincarnation or new life, there was no point to fight against the darkness.
*Decades later...
*A kid found themselves on the top of Eden, and fell down a hole...-
Bookmark Notes:
R: 15 O: 15
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SKY COTL AND UNDERTALE ULTIMATE CROSSOVER!!!!!
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An Alternative Timeline of Zarla's Handplates in which the interference of the Ukagaka Human causes Gaster to reassess his priorities.
This story picks up near the end of yamina_chan's Relocation with Gaster's confrontation with the human working out better for him.
- Words:
- 95,588
- Works:
- 3
- Bookmarks:
- 25
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1
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Asgore didn't know what the make of the boys, and time had only increased his bewilderment. Initially, he'd thought once the language barrier was overcome, and the boys had had time to adjust, their idiosyncrasies would dissipate. In some ways they had. He no longer found them experimentally poking at light switches or trying to eat crystals.
Yet time had not erased all their peculiarities. He couldn't understand how they did the things they did. How had Papyrus gotten on the roof after Asgore dismantled the trellis? How had Sans gotten into Toriel’s room when the door was still locked? How did Papyrus navigate regions of the underground he'd never seen with a familiarity he couldn't have had? How did Sans know Asgore's darkest secrets?
Some of their strangeness he blamed on Gaster. When he'd voiced concerns over their social and emotional limitations, he'd been annoyed at Gaster's bemused look, until he'd realized who he was dealing with. That the kids were even capable of showing affection for one another was remarkable considering their father, but Asgore worried for the future.
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"Okay..." his voice wavered "Well, I got this feeling at the back of my mind, a very new and strange feeling"
The skeleton played with his mittens, calming himself down, making it all easier. "The feeling... as if nothing matters..."or
Depressed Papyrus tells Sans about his feelings.
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The More You Know! by WhatamIDoing_GoodQuestion
Fandoms: Undertale (Video Game), Deltarune (Video Game)
18 Sep 2025
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Twice did Seam hear about this strange door from their friends, a door that appeared in a hallway that wasn't always there. Only once did the see that door, and only once did they enter it.
That's how they met The Man.
Like a 5+1 thing but it's a 2+1 instead because that's all I could come up with.
Series
- Part 3 of Darkners? How About Monsters!
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Undertale/Deltarune Tumblr Requests by Taliax
Fandom: Deltarune (Video Game), Undertale (Video Game)
15 Jan 2023
Summary
Unconnected Tumblr requests. Includes some Deltarune oneshots as well. Follow me on Tumblr @smells-like-mettaton to request fics when I reblog a prompt request post!
- Words:
- 40,933
- Works:
- 42
- Bookmarks:
- 12
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Neutral ending time, folks! Queen Toriel has returned to rule, but things are never smooth for a new ruler, especially when times are grim. Conflicting ideologies threaten to tear apart the Underground... and at the heart of it sits the royal scientist, staggering under the weight of her secrets.
Things may go in unexpected directions, so if you want to enjoy this story to the fullest, I suggest not reading the tags.
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Eloy & Ilias | Errorink - Error!Sans x Ink!Sans by my_own_new_paradise
Fandoms: Undertale (Video Game)
05 Mar 2024
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Summary
Error felt so much boredom and monotony in his life that he needed something new to fill him with life.
He began to travel through the different alternate universes to investigate which were the most susceptible and possible to be eliminated in the future, until he arrived at Humantale and things were no longer the same...
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Sans' original plan was to shortcut to where his telescope was so he could bring it back to the surface with him as he stargazed.
But then he saw Grillby's, and the plan immediately changed.
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STARGAZING
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Summary
Fallen Under is a full-length fan-novel of the game "Undertale" set in "Underfell." This work will not have anything sexually explicit, though there is a gore warning later on. It is light of heart, but some dark themes including suicide, abuse, and murder are explored.
Mt. Ebott is famous for the woods that a child may wander into and never return. In legend, monsters snapped up children from villages, hid in dark corners, and ate the souls of the weak or unprepared. When a young child chooses to flee into the mountain rather than face human capture, they find out that these monsters might not just be characters in old children's stories.
Frisk Foster, an eight-year-old child cursed by hereditary blindness, falls into a cavern full of merciless monsters, all of which want nothing more than to steal their soul. Armed with only their sense of justice and kindness, Frisk must travel across the underground to get back home. Yet when faced with the terrible truth of the consequence of their escape, can they truly find the will to complete their mission?- Words:
- 116,912
- Works:
- 5
- Bookmarks:
- 13
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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.
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- Part 40 of Undertale/Deltarune Tumblr Requests
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Why write something positive when you can write about your favorite ship when the other one is dead? I feel like this idea has been used many times before but I wanted to try it myself.
I wrote this to practice and I'll probably write a lot of one shots to improve my writing.
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- Words:
- 8,741
- Works:
- 6
- Bookmarks:
- 6
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Bookmark Notes:
Holy pudding sheets.
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Summary
A faulty Reset sends a wannabe gamer spiraling into the world of Undertale where she has only her memories of the game, her wits, and a healthy dose of sarcasm to help her survive until the end of the game. Self-Insert as Frisk. No romance except for what’s canon. Plenty of fourth-wall breaks.
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- Part 1 of MyVerse
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8
Terminei
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Ch 4
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41
Well,
Cool
41 out of 42
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Summary
If failed experiments, warped timelines, and emotional family drama weren't trouble already, a seventh human has fallen to tip the balance of fate one way or another. And if one human wasn't bad enough, there may be someone else looking to take a hand in the underground's fate, at least where it concerns a couple of skeletons...
The continuing of an Alternative Timeline of Zarla's Handplates in which the interference of the Ukagaka Human causes Gaster to reassess his priorities.
Series
- Part 3 of To The Marrow
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Bookmark Notes:
Handplates AU fic with the very best characterisation ❤️
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