21 - 40 of 608 Works in Protective Sans (Undertale)
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Sans is dead. That's really all there is to it. Something to do with a science experiment gone wrong a long, long time ago, before monsters were even forced Underground, and now he just... Kind of floats in The Void for all of eternity.
It's pretty boring.
Like, extremely boring.
You know, aside from just... Being very very dark.
...
Until it isn't.
Until he actually has something--or rather, someone--to look forward to seeing everyday.
And suddenly, his world isn't so dark anymore.
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You fell into the Underground as a child. You spent a few years there, growing up with the skeleton brothers. Life wasn't great, painful at times, however you had your family with you. A change came to your life, one where you were surrounded by alternates of your skeletons. They were nosey, pushy, and much louder than Papyrus. They were nothing like your skeletons, and you very much didn't approve. You didn't know how to act, you didn't know if you could trust them, didn't know how to trust them.
There were too many factors. Monsters were there that you couldn't be around. But maybe.. some can help you?
Series
- Part 12 of Reader Inserts
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After taking the test to become a royal guard 46 times, Papyrus has given up. Now, his father has to get involved and see what on earth could make the Captain turn away his son, and historically Undyne has *not* been a fan of the scientist.
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What A Very Small Price To Pay! by Sneakyfox55 for Blupani_Lov3r
Fandoms: Undertale (Video Game)
06 Apr 2025
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Not that he would ever directly say so. He isn't very good with words in that regard, but...
His brother is his whole world.
A few tears on his own part would never be anything, if he could trade them in just to get Sans to smile.
Series
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When Everything Falls Apart by Crossbonesno1fan, TheGreatMorales
Fandoms: Undertale (Video Game)
01 Apr 2025
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Frisk finally did it. They broke the timeline. The entire world is falling apart.
No one was prepared for this.
Except Sans.
'Of course that stupid Smiley Trashbag knew what was going on.'
But will he be able to save everyone and fix the timeline?
'Knowing his track record?
Probably not.'
To Flowey's surprise, he actually does.
The one thing Sans didn't do?
Save himself.
(part 1 of Sans in the Multi-Multiverse)Series
- Part 1 of Sans In The Multi-Multiverse (SITM-MV)
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Bare Bones (Undertale Mafiatale/Mafiafell/Mobtale Sans and Reader Enemies to Lovers Romance) by aleppost
Fandoms: Undertale (Video Game)
26 Mar 2025
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After your mother (the last person that cared about you) passes away and you lose your job, you decide that you are going to move out of Ebott City to start a new life. On your last day in Ebbott City you make a wish into a fountain, and end up falling in. When you get out of the fountain however you find yourself face to face with a pair of skeleton brothers, and for some reason its now the 1930's???? It turns out that the Skeleton brothers are the head of the Mafia that runs your side of the city, and you now live in their district. Papyrus seems to be nice, Sans however is skeptical of you and your intentions and makes it known pretty quickly. Reader has to navigate living in a different time and figure out what their life will look like moving forward, and she wants these strange skeletons to be a part of it.
This is a slow-burn romance where Sans doesn't want to like you, but cannot seem to stay away. Enjoy!
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A young lady had spent almost half of her life in the Ruins with her mother and other monsters. The only thing that could still make her heart skip a beat was her pen pal, with whom she had been exchanging letters for almost six years.
But one day, after she told him she wanted to meet up - perhaps even leave the Ruins and her family - he stopped writing back...
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After Frisk and Kid manage to break the Barrier and free the monsters from the Underground, the humans and monsters of Ebott must learn to get along.
Heheheheheh, good luck with that...
Series
- Part 2 of United SOULs
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Crystal Balls and Monster Souls by WitheringEffect
Fandoms: Undertale (Video Game), Deltarune (Video Game)
18 Mar 2025
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Frisk dove headfirst into the Underground after spending all her childhood listening to her Mama tell her and her brother stories of the Monsters trapped below.
What she didn’t expect once she had freed them was not only did Sans have some SOULbond with her mother (ew, that’s her Mama, Sans!) but when Sans accidently brings different versions of him and Papyrus…
Frisk did not sign up for this! All she wanted was to free the Monsters from her Mama’s stories!
While you had certainly seen a lot during your years, suddenly meeting your SOULmate (whom you had believed to have outlived) was like a dream come true. Monsters were getting their rights and freedom, and your relationship with Sans was steadily growing.
...Now throw in four alternate versions of your SOULmate and you're in for a bit of a ride.
Especially when some unwanted familiar faces reappear.
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You, Sans and Papyrus embark on a picnic
Series
- Part 18 of Undertale aus with kid reader!
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You’ve grown used to the bruises, the insults, and the endless hours of work just to stay afloat. But when a two skeleton brothers move in next door, one of them sees right through your facade. Can he help you find freedom from the life that’s breaking you, or will you be trapped forever?
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The way of a Glutton is a non-canon Reader insert story that takes place in the story of Red Mass, a self AU of Undertale.
You are getting a new job in the City of Paradise, the City of which Sans (Dee) and Frisk built.
Although you want to work in the city laboratory and also fulfill your dream of studying magic, you also get to know more monsters that you have ever seen in your life. And maybe your dorky skeleton boss asks you out on a date?
This story will contain lots of drama, blood and tears.
So be excited for it!
Series
- Part 1 of The Way of a Glutton
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What if the Underground started glitching? What if whenever two parallel Timelines, one Undertale, another an Alternate Timeline, Reset at the same time, a bit of the Alternate Timeline leaked into Undertale? What if there were side effects of this happening, like nightmares each time a synchronized Reset occurred? And what if Sans was effected worse than the others with the effects much more severe and some other effects others don't have? What if there were three Alternate Timelines parallel to Undertale, and what if those Alternate Timelines just so happened to be Dusttale, Horrortale, and Something New (AKA Killertale)?
Discord server: https://discord.gg/wQfvxyEuvj
Tumblr in case you guys want to make fanart: https://www.tumblr.com/werecat1234
Series
- Part 1 of Werecat's UTAU Megaverse
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Created by a laboratory along with other Monsters, (Y/n) or as she used to be known SKE-7, has been on the run most of her life from the shady group simply called 'The Company' that sought to use Artificial Monsters as tools or weapons. She lived in hiding with the scientist who made her and his son for years when suddenly Monsters came to the surface from under Mount Ebott, not long after Monster experimentation was declared illegal finally giving (Y/n) the chance to live out in the open and achieve her dream of being a Chef. Sadly Skeleton Monsters are quite rare, but just as she thought she'd be the last of her kind she runs into some unexpected, or we should say a skele-ton of surprises! Our Skelly is free at last to enjoy her life...but are there trials ahead?
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Sans's brother was always good at waiting.
Or:
Why they moved to Snowdin (it wasn't just the rent). -
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You recently moved in with the skeleton bros and their mate Charolette. Charolette, while caring deeply about the boys realizes she has feelings for women only… including you! Now you’ve gotta navigate your bi life with a bunch of sweet skeletons and heartbreakingly sweet girl chasing after you.
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▃▃▃▃▃ where an elf and her housemates end up not having a so peaceful day.
𝐎𝐑 in which Sans messes with the machine, accidentally teleporting alternate versions and himself and his brother into their AU.
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When a college drop out is desperately in search of a job, an ad online leads her to a desolate mall filled with dusty skeletons and a whole lot of unnecessary baggage. Will she find a way to wiggle her way into each of their hearts? Or will her own problems weigh her down before she can fix theirs.
Who cares, all she knows is that she's getting paid! Even if it's not nearly enough.
(And yes, there will be smut.)
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One last reset, a true reset. She will fix everything, she will truly save everyone this time.
Frisk is not ending this without Asriel. No matter what he says, this won't be a happy ending without him on the surface.
But is determination enough to save someone who doesn't want to be saved?
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Sans immediately knows something is different about Frisk, the second he sees them. He also knows they are going to cause him nothing but trouble. He finds he doesn't really care, because he's never felt the way he feels when he sees them before, and because against all odds, they are the kindest creature he's ever met.
Frisk is desperate to free themself and their friends both from the resets they inadvertently cause and from the barrier. They find an unlikely companion in Sans, and together they try to find some way to let Frisk survive while still doing the right thing. It is all complicated by the feelings that start growing between them.