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Sick To Death (Of Me Chasing You) by CrossoverAU
Fandoms: Undertale (Video Game), Alice by Heart - Sheik/Sater/Sater & Nelson
23 Jun 2025
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Summary
Raine was sick. Really sick.
The kind of sick where, despite not knowing what she had, she knew she didn't have long left.
Her best friend Sans knew that too.
Not wanting her to live her last moments trapped in her house, Sans read her one of her favorite stories, Alice in Wonderland.
While chasing her through the pages, Sans learns that he loves her too much to let her die.
Will he be able to let her go or will he try to selfishly stop the clock?
Aka an Undertale/Alice By Heart crossover fic because I couldn't find one
Note: knowledge of Alice By Heart isn't needed to read this fic!
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Summary
Frisk, the beloved Ambassador for Monsterkind has just suddenly up and vanished.
No one knows where she went.
And she's being charged with murder.
Sans has been her bodyguard since the first day that Frisk took them all down to the city of Ebott.
As the Judge, he may be her only hope of finding the true culprit.
- Language:
- English
- Words:
- 4,364
- Chapters:
- 4/?
- Hits:
- 3
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A Third Chance by NullVol
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
23 Jun 2025
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Summary
Very few people get a second chance at life, but what if someone had the chance at a third?
Tags are subject to change.
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Summary
The arrival of monsters from Mt. Ebott threw society into disarray. Not only was a previously unknown species discovered, but the shattering of the barrier released centuries of magic back into the world. As society struggles to move forward from their bad history with monsters, MOPA, “The Monster Obligated Placement Act” was formed. As such, all mages must provide housing for a minimum of one year for a MOPA designated monster family.
Having jumped through enough hurdles to kill a horse, you are finally forced to house a family of your own.
Between eight skeletons of varying color schemes, your reluctant past, forgotten dreams, and a desire to make up for your sins, you are forced to use your wits in a world breaking at the seams.
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You were always so warm.
Too bad you didn't exist.
+ + +
Living in Snowdin could be rough. With his nagging younger brother, the 'kill or be killed' mentality, and the human runt who kept coming around to release them from the Underground, just to throw them back in again because something was missing - he was tired. Exhausted even.
So, when he starts dreaming of a lover - someone to hold - someone soft and warm and humorous, he starts losing his typical edge. Even though you're just a dream, he's keenly aware that there are somethings that no one's taught him before... but you have.
Papyrus has started to notice something's... off. And so has Frisk.
Series
- Part 1 of Sweetheart Underfell Sans
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You babysit Frisk for extra income whenever Toriel has to stay working later hours at her new school for monsters and humans.
Until, one day, she calls saying she can't make it, and that someone else will come to pick them up.
That's when you meet him: a skeleton monster looking as haggard as a shipwrecked man, and smelling of smoke and booze.
You offer him some dinner and a cup of coffee over some small talk, and then, he gets comfy on your couch.
It feels bad to ask him to leave, so he ends up staying the night.
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Summary
A fanfiction set after the Pacifist route. The characters you love are here : growing, evolving, finding their place on the surface. But with change comes the unexpected. And nothing will unfold quite the way you imagine.
New faces will appear too, including a young human woman who gradually becomes part of the group, discovering them, and herself, through fresh eyes.
This is an immersive story. Unpredictable. Sometimes funny, sometimes emotional, sometimes unsettling. Chapters will shift in tone and length, often illustrated, and with interactive moments where YOU get to decide what happens next. Just like in the game, you’ll have power. Or at least the illusion of it.
Forget what you know. Forget what you’ve read. Set your expectations aside and take the plunge.
- Language:
- English
- Words:
- 7,244
- Chapters:
- 3/?
- Hits:
- 5
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A stand-up comedian with a bad temper and low motivation ends up falling for Frisk's homeroom teacher, her irritatingly soft voice, and her smug attitude.
Who would've known?
There's probably a lame old joke hidden in there somewhere, but he doesn't give a damn about that right now, so maybe come back later, and he'll think of something.
(Mostly told from his perspective, but there will be chapters featuring Second Person POV.)
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Grillby knew he still had much to remember, but he enjoyed their time together. Though an unspoken thought haunted him: What had happened before Gaster disappeared? Grillby never brought it up for fear of frightening his love. He was sure the memories would come in time.
In which Grillby begins to remember the sad memories.
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Deltarune AU with the plot of Jennifer's Body/Ginger Snaps and other additional headcanons that I wrote for fun.
Susie and Kris get attacked by a mysterious creature, causing only her to get infected and possibly lead her to becoming a mindless, killer beast. -
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The forests of Underfell are expansive. When the Fell brothers investigate in one of the worst blizzards of the Underground, they find something unexpected.
Series
- Part 1 of A Rogue What?!
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Frisk has faced danger and death many more times than any child should ever have to, but they aren't out of the woods yet. Being the first human in who-knows-how-long able to use magic has shoved them back in the spotlight. And just when their life was settling down into whatever counts as "normal" for the town of Ebott's Wake, where monsters sell ice cream and the gym teacher thinks anime is real.
It's nothing they haven't had to deal with before at this point, but that doesn't mean it's going to be easy, even with Papyrus taking over as Ambassador and the Finest scientific minds in the town working on a way to help Chara. After all, the first fallen human climbed Mt. Ebott for a reason, and it wasn't a very happy one.
And now, that reason knows about Chara too.Series
- Part 3 of We're Not Weird, We're Eccentric
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Dying wasn't on my bucket list, nor was being born again.
But at least I wasn't born human again. So, that's a new life experience... with a bonus new life I didn't quite ask for.If only it also came with a manual and a pair of dragon wings.
(Slowburn sans × OC)
{Haphazardly edited} -
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Series
- Language:
- English
- Words:
- 377
- Chapters:
- 1/1
- Hits:
- 9
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Spider-Doe 2: The Black SOUL by doyouhearthunder
Fandoms: Deltarune (Video Game), Spider-Man - All Media Types
22 Jun 2025
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Summary
Noelle Holiday is Spider-Doe, and the whole world knows it. But shedding her secret identity hasn't made life as a superhero any easier. With her partner Kris (aka the Amazing Spider-Human) reluctant to put on the mask again, and supervillains targeting her and her family, Noelle feels alone and overburdened, struggling to balance her responsibility to protect the city with the needs of her own life.
So when an unexpected power-up finds her, in the form of a strange bond with a symbiotic lifeform, she welcomes the alien entity into her mind and SOUL. Anything to help her survive the threats she faces as Spider-Doe.
But great power comes at a great cost. And when tragedy strikes, Noelle starts to go down a dark path - one that will force her to decide what kind of hero she truly wants to be.
Series
- Part 2 of Spider-Rune
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Summary
It isn’t fair. You just wanted to be left alone…
Isn’t this what you deserve though? You broke the rules, everyone was perfectly upfront with you on what the conditions for being allowed to live were. It’s the right thing to do, what’s one more time?
Maybe they’ll forgive you if you let them… maybe they’ll forgive you.
You look up at the expressions on the monsters’ faces and you know in your heart that this isn’t going to stop.
Series
- Part 4 of The Power To Reshape The World
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Escape isnt always easy and freedom isnt what its cracked up to be.
Series
- Part 2 of Ebbot Mountain Zoo Chronicals
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Waking up in an empty underground with no memories other then common sense: Check
Constantly seeing numbers all around you, not knowing how to get rid of them: Check
Looking Like a computer crash in real life: Check
Who the Hell did I piss of to get like this
[ Sorry I have no idea how to do summaries, But this is my take on Fatal Error, he is a lot more Out Of Character then compared to canon and he has a different backstory then his canon counter part.] -
Beautiful Times by CaptainExtremis
Fandoms: Undertale (Video Game), Deltarune (Video Game)
22 Jun 2025
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Summary
A look into the time after the Barrier between worlds was broken, told in separate but connected vignettes.
Or:
The story of three humans, the monsters they knew, and how they worked toward a common goal without realizing it.
I fought all through the night, oh, oh, but I made it alive.
The sun's starting to rise, oh, oh, these are beautiful times.
This fight of my life is so hard, so hard, so hard...
But I'm gonna survive.
Oh, oh, these are beautiful times.Series
- Part 2 of Crazy Mirror AU
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Three Strings Dangling by TheFandomFiction
Fandoms: Deltarune (Video Game), Undertale (Video Game)
22 Jun 2025
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Summary
How do you tell people you have voices in your head? Kris has been wondering that since they were very young. Normally that would be step one to getting help, if only the voices in their head weren't very real.
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The events of Deltarune, but Kris contains three souls. Their own, Frisk, and Chara's. And Kris isn't even in control of their own soul to begin with!
A restart of Three Strings, with new Ch 3 and 4 information incorporated. I wrote myself into a hole.