Some sans au books i found
131 stories
(HIATUS) Baby moon  by Loverofyaoi22
Loverofyaoi22
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Nightmare wants a baby so badly after the 30 year truce with his brother and his boys have left the next to have kids of his own. Problem is, people are too scared of him for a relationship to get to the stage of having kids. Broody mama nootnoot just wants a child of his own.
| Conflictions | Cross Sans x Horror Sans | by onehangryhorror
onehangryhorror
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When Horror greets a new addition to his gang, he starts to form a bond to him, finding himself dwindling into the world of smitten love and confusion. The two grow closer by the days. It's only a matter of time before Horror cannot withstand the pressure in his chest to confess. This story will contain smut and fluff both. (Warnings will respectively be given.) Gore, strong language, graphic descriptions, and trauma of multiple types. (TW's will also be given beforehand.)
Dysfunction to Refunction by BlindBones
BlindBones
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Balance was tipping in the Star Sanses' favor and Nightmare can't keep up. He needs to make his own group to balance out the multiverse. Is recruiting the Bad Sanses really about balance, though? Or because of something else...? Cover by me No beta, we die like men #1 in balance
Multiverse's Unwilling Protector by Lxzaruss
Lxzaruss
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Formerly known as, "I Became the Forced God of Creation". !!STORY COVER IS MINE!! What if.. Error isn't a forced god but Ink is? What if Ink had enough and committed death and chose someone to be the next Ink, the forced god of Creation? What will happen next..? Will they end up like Ink or.. A brand new fate and destiny awaits..? (FGod concept which is not mine and this story is an original idea of mine. Undertale doesn't belong to me nor any of the characters shown in the story. That's all thanks for reading.) (FGod Ink belongs to me, FGod Error belongs to Harrish6.)
The Silent Destroyer by fublle
fublle
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cover art isn't mine and belongs to its rightful owner Error is finally ready to give in. The multiverse he spent so many eons protecting and keeping the balance is rebelling against him. The AUs he has spent so long protecting are rebelling and are soon to be destroyed, but worst of all, all of the Sanses hate him for some reason. And I mean ALL. Why should he continue? There's nothing to live for anymore. Not even his family can help with this. Or, the people he thought to be his family.
If it keeps you warm,Keep it close (dreammare/nightdream fanfic) by InkyOverlord
InkyOverlord
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Dream suffered mentally after the apple incident,now he is has to keep the multiverse which has worsen him. After being kidnapped by the Nightmare gang,he doesn't believe he'll make it out alive-- luckily Nightmare has some unfinished business with him that might unravel some hidden feelings..
Papa Nightmare ? by floppychu
floppychu
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As the boss of his castle Nightmare takes responsiblity for his Bad Boys, some may not know that the dark skeleton is actually caring about them. Well you are about to find out in little one shots :3 includes ships like: Bad Sans x Bad Sans Attention: Cover picture drawn by me Don't Copy. Don't trace. Don't steal. I worked hard and Work hard on pictures and stories. Hate will be blocked.
Bottom Nightmare oneshots by Error-GenderNotFound
Error-GenderNotFound
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Just a bunch of bottom Nightmare oneshots.
Nightmare in another multiverse as an expecting mother of 5 by nelliesheerin
nelliesheerin
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nightmare and his gang that he thought of as his children were fighting the star sanses and the entire multiverse they were losing and almost the entire gang died the only one left was nightmare but thankfully nightmare learned a forbidden spell before the fight just incase things went side ways it was suppose to bring people back to life but it needed at least one female or someone like a skeleton monster that could be both genders to work whatever that means. if only he knew he would end up as his gangs mother for real he would have tried to find a better way but there is nothing he can do now. 'fgod belongs to harrish6.'
Wings by DriftingDeadlocks
DriftingDeadlocks
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Cross doesn't want them to know, he doesn't want Nightmare to find out or anyone to find out between Killer's Raven wings with hidden feathers as sharp as blades, Dust's Falcon wings that are the fastest in the sky and Horror's Condor wings large and imposing forcing enemies from the sky his wings were pathetic they were small and fuzzy with downy feathers he couldn't even fly with them yet though they wouldn't be fuzzy next year, next year he'd shed all his downy feathers for flight feathers he just had to hide the fact he wasn't an adult yet. He could do that, how hard could it be? Or Cross is trying to hide the fact he's 17 when everyone thinks he's out of stripes because he's scared that Nightmare and the others will send him back in his abandoned world.