*slaps reading list*dat some good undertale shit right there
5 stories
Under the Veil by Poplasia
Poplasia
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    Parts 76
Sans has gotten himself stuck in the void between worlds in a successful attempt to stop the resets of his timeline. He's not sure how long he's been chillin' alone there, but eventually a chance at escape stumbles his way in from the Veil of Death. His name?-Sirius Black.
The Newest SCP (Undertale x SCP Foundation Oneshot) by BubblyShip
BubblyShip
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    Parts 1
There have been many stories where, after a genocide route, Sans ends up inside of a different world. That's the typical transportation that occurs. Not in this world. Sans accidentally ends up on the other side of the computer screen after a teleportation goes wrong. As a skeleton, it doesn't take long before the SCP Foundation finds him. He never really stood a chance. (This was a wip forever so I just decided to get it out, might as well entertain or inspire some people to write fics. Cover isn't mine.)
Five Places Sans Most Definitely Should NOT Be Sleeping (An Undertale Fanfic) by Doctor_Discord
Doctor_Discord
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    Parts 5
Sans falls asleep in some pretty spectacularly weird and inappropriate places. This is just a small collection of those places, from tame spots like the middle of the doorway to stranger places like the inside of his trombone. With a hint of plot in the background.
Royal Blue by dealialestina
dealialestina
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    Parts 46
Sans knows a lot about secrets; he hides many. But when old burdens emerge from the darkness, secrets, new and old, put his brother in danger; and what else can a good big-bro do but begin a double life? This decision haunts him, even years after his suit of armor is stocked away and hidden, after his quaint life of depression, puns and resets are set to loop forever, and his part in the war is forgotten... But then, the barrier is broken. And it is quickly realized that this is not the end, but a beginning of something new. Something that feels like dust, blood, and a suit of armor; an old lie to slip into once more. (Currently being completely overhauled! Anything without a chapter title (ex.: chapter 4, chapter 5, etc.) is old and will be re-written!)
Not a Hero, Not a Villain (Undertale x My Hero Academia) by BubblyShip
BubblyShip
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    Parts 14
After a genocide run, when Frisk decided to destroy the world, Sans' soul didn't make it back. It ended up inside the body of a woman, who'd quirk was to destroy her soul and place another into her body. Now, in the body of a woman, with no money, no friends, and nothing but his natural skeleton powers. Until someone sees him and offers for him to become an assistant teacher in one of the most powerful schools in the world. It's an offer Sans can't refuse. !DISCONTINUED!