Undertalesans Stories

You were a normal human living on the surface until one day, monsters appear from the underground due to the barrier being broken by a small human child called Frisk. T...

Moved from AO3 because of reasons! "You are the only maid (or worker in general) that serves for the Skeletal Household. It's a skele-ton of work, but you manage by...

Mainly what the title says. Lots of Sans, ton of SANS, Undertale sans, undefell sans, ALL THE SANS. BUT WITH A CHUBBY READER. WHHHAAAAT I KNOOOOW. READ FOR THE FLUFF...

--Long ago, two races ruled over Earth-- --HUMANS and MONSTERS-- --One day, war broke out between the two races-- --After a long battle, the Humans were victorious-- --T...

[Highest Rank: #1 in "sans"] [Second Highest Rank: #18 in "xreader"] (Girls only!) (Earlier updates are on my Quotev account!) WARNING: Profanity a...

Everything was normal in Nightmares castle. All the 'Bad sanses' were doing their thing. Well, what happens when they decide to question Nightmares mysterious past and s...

a golden soul so a exceptionally rare soul that provides great power but comes at a price most monsters thinks the golden soul is a myth but what happens when a monster...

An au sanses x MONSTER reader x au papyruses? Papyri? A fanfiction, it is not self-indulgent. So if your just lookin for some fanfiction to put yourself in, here it is...

𝐍𝐢𝐠𝐡𝐭𝐦𝐚𝐫𝐞 𝐡𝐚𝐬 𝐠𝐫𝐨𝐰𝐧 𝐢𝐧𝐬𝐚𝐧𝐞. 𝐇𝐞 𝐧𝐨 𝐥𝐨𝐧𝐠𝐞𝐫 𝐞𝐱𝐢𝐬𝐭𝐬. 𝐈𝐭 𝐜𝐚𝐮𝐬𝐞𝐬 𝐦𝐚𝐧𝐲 𝐭𝐨 𝐟𝐞𝐞𝐥 𝐞𝐦𝐩𝐭𝐲 𝐚𝐧𝐝 𝐥𝐢𝐭𝐭𝐥𝐞 𝐦𝐨𝐧𝐬�...

This is a medieval AU, where Classic is a prince of a kingdom, while Red is a thief/bandit in the Kingdom Classic isn't happy with his life, all the formalities and etiq...

After falling down Mt.Ebbot, you find yourself in Snowdin, a small town in the UNDERGROUND where two skeleton brothers live, Sans and Papyrus. These brothers are vary qu...

After unexpected events land Sans into the hands of the elusive ninja turtle brothers, he learns of the Kraangs evil plan involving him and his brother. (Completed Decem...

Warning this contains suicidal thoughts. If you're sensitive to that sorta stuff I don't recommend reading this.

{COMPLETED} When Frisk climbed Mt. Ebott, she had expected to simply be erased from existence. But instead, she awoke Underground, and found herself in the hands of crea...

Since there is no or any "bonely hearts club x female reader" I will be the first one to do it... so I hope you enjoy this book.

Just a whole lot of gay skeletons. Possible Lemon. Possible Emotional Roller coasters.

One day, Sans fell sick. His sickness came out of nowhere and it cannot be cured no matter how many medicines Gaster gave him. Because of the sickness, Sans stayed still...

this is about sans x male reader wich is kinda fun to do soo plz enjoy

You've been living in the Underground for the past 2 years as a powerful Spell Caster, you prefer living in the Underground than up top on the surface as you find Monst...

The secret love life of Sans and Toriel. ... It was a beautiful day outside, birds were singing, flowers were blooming. On days like these I would be taking my daily nap...