Top 10 Best Explicit Undertale Fanfics

by absurdmagewrites · Sans/Reader, Papyrus/Reader

Sometimes life throws you a curveball. For you, your curveball was going to bed looking like a human, and waking up looking like a monster. A skeleton monster to be precise. With the barrier breaking, a large surge of magic descended on the town you live in, and transformed you overnight. Unsure wha

by this_is_my_alt · Sans/Reader, Papyrus/Reader

A misunderstanding lands you in a meeting of monsters and fetishists. From the chaos you find yourself in the dynamic company of a kinky Mutt, gasterblaster! Sans, and a cat-ear wearing Axe.Deals are made. Boundaries are broken. You become thoroughly entangled in this group of horny skeletons with v

by MissSugarPink · Sans/Reader, Alphys/Undyne

Your name is unimportant. Your job is nonexistent, really. And your (ex)roommate just kicked you out in the middle of a surprisingly cold November night. But whatever. You don't care. You'll be fine. Keep telling yourself that as you freeze to death, idiot. But you'll be fine, for one reason! Two, a

by BattleMaiden13 · Papyrus/Reader

You have no idea when the world went to shit, but your pretty sure it was either when the dead came back to life and chowing down on anything with a pulse OR it was when you flunked out of college. Either way the world sucks now. You aren't entirely sure how you've survived this long either but your

by Quinme · Sans/Reader, Papyrus/Reader

One moment you were on the call with your friend, the next you are in a shady dark alley, pressed by... a crocodile in fedora? Life is confusing, and you have no damn idea where you even are and what will come next.

by only0neMan · Sans/Frisk

A retelling of undertale, except Frisk is older, everyone has a giant cock, tits, and booty, and I get to write it. Lemme know what you think! I wrote this in 3 hours at 1 in the morning. Also, Frisk uses they/them in this because if I'm gonna shapeshift em anyway, might as well make them an enby

by Saiyurimai · Sans/Frisk, Mettaton/Papyrus

The life of a prostitute is a lonely one, something Frisk has learned all too well. It also is a dangerous profession. Full of risks and dangerous clients, one of which has just become her regular. But he's not like the others. This strange monster, what could he possibly want with a broken whore li

by The_Writing_Mobster · Sans/Frisk

Frisk Starling should've been used to cases like these. After all, it was her duty to investigate. Give the victims their voice back, catch the sick freak who did it and give the broken families the justice she couldn’t have for herself. That is until a string of murders throughout the county begin

by Ichigh0st · Papyrus/Reader

It’s fun being dead.Or undead, rather, as your sister likes to correct you. Your dear sister is the kind of person who took her dark arts very seriously. Or, her necromancy, rather. You’ll be the first to admit, you don’t know a lot about her school of magic. She doesn’t know much about yours either

by FuCkInG_FaBuLoUs · Sans/Reader

Hmm, such a thing of wonder in this crowdI'm a stranger in this townYou're free with meAnd our eyes locked in downcast loveI sit here proudEven now you're undressed in your dreams with me ~~~~~~~ You didn't cheat out of retaliation. To make things even. Perhaps some part of you did, a small vindicti