Undertale aus and crossovers.
3 stories
"Baby Bones" An Undertale Fanfic by Silver1212
Silver1212
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    Parts 5
Sans has a good life. A caring father, an adorable baby brother. Things couldn't have looked better. But soon after the two started school in snowdin with the other monsters instead of being home schooled, disaster strikes. Will Sans be able to get through this newfound relization unscathed? This story goes by the theory that gaster is the father of papyrus and sans. Though the theory is incomplete since no one knows who the mother is. For all we know sans and papyrus could have been made in Gaster ' s lab since they just "appeared one day" No one really knows, but it's fun to debate about. Enjoy
Cage Of Bones by Author_Kun222
Author_Kun222
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    Parts 56
Ever since the barrier was broken and monsters rose to the surface once more, it seemed like despite the odd reception that they received from the Humans of Ebott, everything was starting to take a turn for the better. But almost a year later, the others couldn't help but notice something different...specifically...SANS was different. The usual laid-back, wise-cracking skeleton was acting...strange. His smile was forced, he didn't tell jokes, he's deprived of sleep, and the demons that were thought to have been put to bed ages ago keep rising back to the surface to torment him. It was no secret anymore. Something was wrong...VERY wrong...but what? (Current Chapter Status: Chapter 46 Pending) Cover art by- @CarrieTheEnder Ranked #280 in Fanfiction 12/19/17 Come join the Cage Of Bones Discord group!- https://discord.gg/R4Q92Nnn
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!)