Reborn as fell but a.... HUMAN Fell!!! Sans Au's x human fell!reader

You got backstabbed in the zombie apocalypse and out of nowhere you were reborn into a Au of Underfell not just any a you a copy of underfell but as humans you make sure in this new life that you raise or at least try to raise papyrus right even though this supposed to be an underfell world how will your new journey begin also this may contain Smut(this will probably be my first time writing smut so if u don't like smut u can skip that part)