Undertale
51 stories
Yandere Sans' X Reader by The_unknown12345
The_unknown12345
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    Parts 17
moving to a new neighborhood! what could go wrong? maybe its the skeletons who live across the street? that's right, skeletons! a love sick household. gotta hope they don't fall head over heels for you or who knows how many could die. but for those who like to risk lives I'm sure you'll love this!(maybe)
Party? (Yandere Undertale Sans Au x Error's Sister Reader) by ChaChaRealSmooth714
ChaChaRealSmooth714
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    Parts 4
All of the Sanses find out about Error's littlr sister. After much convincing, Error finally brings his little sister to Blueberry's party. What could possibly go wrong?
Three Bitty Monsters (Hiatus/ Being Re-wrote) by Fff3ff
Fff3ff
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    Parts 28
Y/n goes out for a stroll at night and find a box with three killers in it,what shall they do?(none of the imagas belong to me)
Dangerous Love (Yandere!Horror!Sans X Reader) by ProphecyDragon
ProphecyDragon
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    Parts 31
so I don't see to many horror sans things... or yandere sans that aren't blue. So lets get the basics! Your Y/N. Your an adventurous soul (let's just say that is a soul type and it's goldenish red, so rose gold) you fall down a hole and find a freaky flower. Later you find that a scary skeleton that is a little possessive over you, soon you just take it as protection.. something went wrong, and now you may only has a GhOsT of a chance to survive (please tell me if I spell things wrong)
Villainous pursuit - Yandere AU Sans x Reader x Yandere AU Papyrus by Mallory_Abi_Moriarty
Mallory_Abi_Moriarty
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    Parts 10
Who thought that one day someone would break into your house and slice your neck in your sleep? Well, that was what happened, right before you were integrated into a shitty yandere dating sim. The catch? You are the Villain who dies before even the prologue finishes. With the determination to live and stupid bravery, you decided to pave your path into surviving, not realizing that instead of paving a path into survival, you paved a path into the souls and hearts of the insane characters of 'Yours to keep'.
Chilled (Yandere Sans x Reader) by thatanimeramenchick
thatanimeramenchick
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    Parts 9
F/N fell down. Down, down, down the dark hole on Mt. Ebott to find a chilling world of monsters where she meets a creepy flower, a loving goat mom, and... Sans. He claims that nothing in life matters, but she just doesn't believe that. No matter what he says about nothing mattering, she thinks that the world is still worth living in and saving. So she tries to create a better vision for him, but little does she know, the results of her words take an unexpectedly chilling turn. (Beautiful cover art not made by me.)
My Special Human (Yandere Blueberry X Female Reader) by Jawstheboss
Jawstheboss
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    Parts 14
Yandere Monsters! Yandere Various Undertale x Reader by xXYandereWriterXx
xXYandereWriterXx
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    Parts 1
Y/n is introduced to the underground after the fall, what happens when monsters and other beings fall in love with this new face? Even worse under a deadly obsession.
Yandere Flowey x Shy Reader Oneshots (Rewrite) by Pinkamena205
Pinkamena205
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    Parts 5
Flowey is one of my favorite antagonist (including asriel) and i decided to make a book about him. Enjoy!
Mine (Male!Chara X Reader X Sans) by xxAnnieSan
xxAnnieSan
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    Parts 23
You've been doing the same True Pacifist / Pacifist Run over and over in a place called the "Underground". Though you like the Underground, you can't help but feel weary.. Every time you [SAVE] everyone, the World just..[RESETS]... And with that, you're back at the beginning again. You just want to go home... Why won't this "Underground" let you leave? ... Well, if you can't leave... Something 'new' should happen sooner or later, right..? (You hope that something exciting or different will happen in the Underground.) (You are filled with DETERMINATION.) --- ;) ~~~Disclaimer: I don't own those (MULTIPLE) pictures used in the Cover. I just mixed them up for a spicy cover. ( ͡° ͜ʖ ͡°) Mash-up covers are the best. ;') (I spent up to 3 hrs mixing stuff around + editing + adding light and shadows...*Dies*) If you have a problem with the Cover, I'll change it.