Warning: possible swearing, inappropriate humour, perhaps lemons? Idk. Just stop being a goody two shoes and enjoy the book, kid

Best ranks: #8 in fanfiction; #1 in undertale; #3 in sans; It was all a dream.....or so you thought.. Edgy: bish how dare u say that was a dreem, it was true af, fite me on dis! *lowvoice* and what im batta do is even more true. *inserts lenny face*

Well yea this is an shipping and yes alot of Lemon cause well Underfell Sans is rough ehehe i know in werid well my first time doing this so if i do make a mistake well comment and help me make it better This can be for guys and Girls i really dont care i know you all think it wrong but meh really dont care if you talk trash cause your just mean :p You had finally got enough of your world everyone was rude actually wanted you gone and actually today your parents kicked you out and so you ran away even though you were kicked out to some werid mountain you heard that if you go there you never come back you end up going there and next thing you knew you were falling down (All pics and undertale goes straight to the owner's)

You died. Again. But, when you woke up... You were back at the beginning. You didn't reset... but something was off. Flowey seemed skittish, frightened even. He was KIND. The people you knew, you once held dear... CHANGED. The entire underground was different... Dark. Nobody seemed to recognize you, but a part of them still remained. Someone who just wanted a friend, to be looked up to, respected... And another who just wanted hope-who was tired of this game... You're left with two choices: Will you kill to survive, or will you die befriending them all over again? Authors Note: This is in the AU Underfell. I recommend looking into it, it's simply amazing to me! Long story short, the "you" mentioned there is Frisk but it was a good description for the AU I found once. This is basically, somewhere the save file got corrupted, and now everything is reversed except Frisk. Hope you enjoy! Disclaimer: I do not own Undertale.

⚠️ WARNING ⚠️ This story is for 18+ only as it contains mature themes and NSFW topics. I am not responsible for minors. Viewer discretion is advised! Been wanting to make this cus' Undferfell Sans is.... NGGGH ~ Anyway Enjoy. Cover art belongs to me IG: sammemcsue 2nd IG: Goretasmic ~!!Please ask permission to use it!!

- Ah yes... you Fell down in Swapfell. Not knowing that you would encounter a strange monster named... Sans. - ( ART NOT MINE )

If you need help (if you read lemons) read this!

Underfell Sans X reader lemon. MATURE CONTENT

I kinda fell in love with the idea of Underfell Sans in general. So why not be creepy about it? Enjoy *Eyebrow wiggle*

Hope you enjoy reading this