Awesome undertale books
18 stories
Everybody Wants To Rule The World « Gaster!Sans x Reader » by tenshiini
tenshiini
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The crown.. The only way to get the freedom.
Underfell  Destructions Pearl by xbutterfly_walkerXx
xbutterfly_walkerXx
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Your friends have dared you to go into the cave that no one had ever returned from, The grusome legends date back for as long as you can remeber. After falling down into a hole that has no escape you must face up against Monsters. who are relentless killers and your only friend is a strange talking flower. Will you survive or die trying?
Punmaster's crush (sans x reader) by dupranae
dupranae
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    Parts 36
Monsters have just taken to the surface. They settle in well, and you decide to lean a bit more. You find yourself at Mt. Ebbot, and fall through the now open 'barrier'.
A Skeleton's Secret ( Sans X Reader ) by Crystallized_B-fly
Crystallized_B-fly
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Sans had a few secrets sure, but there was one even Papyrus shared that they never told anyone...EVER. The true reason why the two brothers were such a mystery to the town, and all the secrets in between. But when [Y,n] appears, their secrets slowly unravel and Sans learns of a new secret he must keep.
When Worlds Combine ~ Sans X Reader by Geekgamergirl101
Geekgamergirl101
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Frisk was a good friend of mine, despite the age gap. About a week ago, they disappeared, only recently found. It wasn't long for Monsters to return as well. I, in all honestly, am scared. The world will be changing, and change never comes easy. Frisk seemed happy, though, in fact so far it's been okay. Frisk introduced me to all the monsters, becoming great friends with many of them, in fact... I've even fallen for one. Unfortunately, I doubt love between a human and a monster will ever be okay, especially when humans have already started to react towards the monsters negatively.
The Triplets A Undertale Short Story by xbutterfly_walkerXx
xbutterfly_walkerXx
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Three boys, abandoned living on there owns. They must learn how much they learn that they all need eachother
In Love With A Killer - Psychotic!Sans x Detective!Reader by PoisonousWritings
PoisonousWritings
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End of Time ( Sans x Reader) by BravePuppy
BravePuppy
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"Here at the end, it's just me and you. I know who you are, you remember who I am." Sans remembering you is the best that could ever happen to your broken SOUL... Maybe together you make this timeline the last one or your ways separate again.
The Kidnap: Psychotic!Sans x Detective!Reader by PoisonousWritings
PoisonousWritings
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This is a sequel. If you haven't read the first book, you're gonna have a bad time (or be confused, whichever)
Gold's Eye GasterSans X Reader by xbutterfly_walkerXx
xbutterfly_walkerXx
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You've heard the stories, of the mysteries of a man who guides lost ladies home by night legend says his voice is like a demon of hell and anyone who's ever approached him has died. One night you get lost and you uncover his real story