Random Undertale AU Smut/lemons

Warning: Does contain mature content. You have been warned.

Children of Chaos

*Just a normal fgod fanfiction. *...or is it? Error gets cornered in Outertale by the Star Sanses. He missteps and falls into the VOID. Blue tries to catch him, but topples in as well. They wake up in (something vaguely resembling) the NaJ universe... as 5-year-olds. The only thing I own is the idea! Undertale belongs...

Sea Travel (Crossmare)

Do you believe in Mermaid? Siren? Kraken? Sea Monster? Giant Sea Horse Or even a Talking sea creatures? Let me tell you something... Everything is possible... The way they stared at me... Their sweet lullaby... I know I one of them... But monster. The one live up at the land. They... Were greedy with our treasure. Pi...

Two Landscapes • Of Sun • And Moon(Crossmare)

Nightmare and Dream are the protectors of the sun and moon tree. Nightmare had enough of the constant abuse that the villagers had gave him. So he ate the dark apples. But before that he met Cross in one of his dreams. Cross wished to meet Nightmare. He was fond of Nightmares company. But if he once found Nightmare...

royalty's revelations {SANCEST MULTISHIP}

a story about young kids meeting each other to learn painting all of them were separated after 13 years.. As the years passed, they all missed each other they all were united in a few years.. but thing weren't the same.. why is that?.. we shall know.. soon.. as we start from when it all began.. of course i'd leave a n...

Papy's New Bitty

US Pap gets a Bitty! Blueberry is always the one who gets one, so I'm determined to write one with Pap! Stretch (US Pap) goes out on a walk for a good smoke. On his walk he stumbles upon Rivetheart's Bitty Care Center. Being close to his brothers birthdays takes a look around, to find someone just right.

So many lil skele's! (Bitty Sans AU's x Child Monster Reader

Your mom works at a daycare for little monsters but recently lost the job and had to take the skeleton bittys home and gave the others to freinds family and Neighbors.Mom said you were extra special because of your soul it changes with your mood Pink = Happy Light Grey = Sad Dark Grey =Annoyed Black = mad Black and...

Giant sans x reader

You heard that the monsters were free from the underground and was very happy to see them .When all of a sudden a jock in your school starts picking on you for liking the monsters and called you monster girl .You decided to not go to school .Passing by you hear a girl screaming and went to help. Three humans were thro...

Little Angel (Sans x Borrower reader)

Hi this is my first story so please don't hate I'm not good at writing tho. Y/n is a rare form of borrower she is known as a fallen angel she has beautiful F/c wings and lucky for her it helps her move quicker and easier. Y/n and her sister lulu decide move to a new house together after their parents kick them out wha...

Fooling Heavens Gates [CrossMare Book] [Discontinued]

Cross is an angel with small ish wings One day he meets another skeleton named Killer how was a new angel. But one day something happened...

The Time Before (Undertale)

~o0o~ Book 1 of the "Better Times" trilogy ~o0o~ (Book two: "A Name to Remember") (Book three: "No One is Happy with This") There was a time where a Royal Scientist got an idea. A time where he created two weapons, who turned out to be people. A time where he built a machine to power the Underground. There was a tim...

InSansity(undertale)

(book 2/2. last book: secrecy) Sans finally reveals his past. but who is W.D Gaster?

Cage Of Bones

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...SA...

Dreamtale Oneshots

A book of Dreamtale oneshots I started writing in 2017 that gradually turned into an actual story by 2020. The writing isn't great at first but I assure you as the oneshots progress you will see improvement :) These are not Dreammare and no ships are made canon, however some are subtly hinted at such as Errormare. You...

Castle's Pet (Bad Guys X Reader)

[Highest Rank: #1 in "sans"] [Second Highest Rank: #18 in "xreader"] (Girls only!) (Earlier updates are on my Quotev account!) WARNING: Profanity and Violence! You were a normal 17 years old girl from the Undertale universe, you fell down Mt. Ebott when you were 15 and you've lived in the Ruins with Toriel. Oddly...

Just a very big love (AU sans x reader)

After All AU's of Frisk's death, all of the sans have been depressed losing their love/friend of their live. Until.........(Y/N) fell to the underground. As all of the sans met her, they soon realize how much she meant for them. As for (Y/N), she began to realize that all of the sans are starting to fall in love with...

Sketches V.S Glitches (Ink Sans x Reader x Error Sans)

Decided to make this little story x3 This story will have a 2 path ending. 1. Ink Sans path 2. Error Sans Path You get to decide who you want :3 Enjoy~ ♡♡♡

"Be Mine"(AU sanses xReader)

(y/n) was born with magic power that anyone couldn't have ,She lives in a beautiful ,huge mansion living with her parents and her parents gave a present and its a puppy with a name of leo until,the day that her parents died in an accident, (y/n) was all alone ,what would she do now without her parents?

Believe in Me

Red and Blue are soulmates. What happens when one of them forgets that?

Puns, Part 2 (Sans x Reader)

The official sequel, probably?

Puns ( Sans x reader )

Warning! There is a chance that there will be spoilers for the pacifist run of undertale. I recommend finishing that before reading this. There won't be any spoilers for the no mercy run, so don't worry about that! Also, don't worry about anything NSFW/lemon if that's not what you're into-there won't be any of that he...

Sans x reader lemon

"protect and be safe"(NaJ nightmare X Reader)[COMPLETED]

no spoiling! Well maybe just a little Ahem* "Y/n l/n is a really kind person" "But she is gone now " "How?" "Why did she committed suicide??!" "Why did she left us? Why did she left me? " "If you only know why she needed to do that " //highest ranking #453 in fanfiction // Disclaimer: Naj and the pictures belongs to...

The Adventures of Nightmare sans x Reader: Story One

what happens when you know the story of the to dream brothers and you have a chance to stop there faint, will you change it or will everything stay the same.

World Upside Down (Crossmare)

cross had started to become more and more depressed by the day the more he saw that no one cared about him. (WARNING: in this story there will be very depressing things such as self harm!)don't own art!

Captured (Underfresh!Sans x Reader) //DISCONTINUED//

You never knew how it felt like to be caged like an animal. But after meeting Fresh, the love you two have for each other slowly burns away. The chemistry, the passion, the honesty. Instead of fixing the mess he made, he decides that you aren't needed anymore. Of course, it wasn't his decision. It was the voice in h...

"Baby Bones" An Undertale Fanfic

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 th...

Cherry Scented ~ CherryBerry Fanfiction

"Yeah you're worse than Nicotine" -Panic! At the disco Opposites always attract . . . Published on -theultimates Written by Emma Cover by @PollyHere

"Knock Knock" | A HorrorTale Short Story

Falling into the Underground where monsters have been banished to for hundreds of years, Y/N finds that the monsters have gone insane from lack of determination; something that monsters need to survive and give them hope. Unfortunately, it seems that Y/N has enough determination to sustain every monster in the Underg...

Test subject

Gaster the royal scientist dark reality, you've seen the boys. You THINK you know there backstory. It's time for a harsh truth about Sans and Papyrus you never thought you would hear This story is based around my friends theory that Sans and Papyrus in a sense where 'made' by Gaster.