During the usual nightmare Sans finds himself staring at a strange reflection of himself. But something is wrong. When he finally wakes he isn't surprised to find Papyrus in his room, staring down at him. But he is surprised by the changes in his brother since he'd fallen asleep. Who is this evil imposter, and why doesn't his magic work anymore? An Undertale meets Underfell story.

Auvie has made a promise. A promise that has driven her to travel dimensions in order to fulfill it. However, she's found herself in the wrong dimension. Can she escape, and what will she find while she's there? (Underfell!Sans/Self Insert, sfw but suggestive, trigger warning for mentions of emotional abuse, violence, also sweating and swearing)

A headache, a migraine, a blackout, and a murder most foul. Possession is a party, and Sean isn't the only guest.

Playing is one thing, being there is another.

I don't know what to call this. It was a requested one shot but will be continued. Oh, and um, it's pretty suggestive so be warned. Plot: sans is tired of killing you over and over, so he's decided he's going to capture your soul in a different way. He's going to make you fall in love with him. (Underfell)

Jack isn't as happy as he always seems. Or as he always shows, anyways. Septiplier fic. Warnings inside.

this is inspired but cartoon junkie again, this fic will be dark and i have no idea what is was doing when i wrote this. so ya, mark is only mention in the fiction. its yoai, dark, and evil. dariplier and jacksepticeye.

A compilation of Septiplier-themed shorts! Read with caution: there will be fluff and there will be smut!

Dr. Alphys has created a machine that can turn monsters temporarily human, and asks Sans help testing it out. what happens when he doesn't know how to deal with the hormones that come with having a human body? Human!SansxAdult!fem!Frisk WARNING: HEAVILY NSFW, VERY explicit. art by Konoira on DeviantArt!

Mark is in Ireland visiting Jack for a few days. Whilst showering, Mark spots a rather large and daunting spider crawling down the wall towards his foot. He screams, he falls and he sprains his knee in the process. Thus meaning he must stay in Ireland for longer than planned, trapped under the care of mother hen Jack. (Sort-of Septiplier. Nothing graphic, kinda cutesy) M for Jack

You're left breathless and bone-crazed before a certain short skeleton comes home from work. He always sees right through you. Contains lottsa smut and sex NOTE: Wow thanks everyone. I didn't expect that many views in that amount of time. I mean it's Undertale, but still.

Yamimash thinks that opening his relationship with Mark to the public will be great... until it isn't. Or the one where Mark doesn't want to break up, and decides to convince Yami in a rather... sexy way.

Several weeks have passed since you fell into these labyrinthine subterranean caverns. It's time for you to move forward. [WARNING: Explicit Sans x Reader, the reader insert's sex is undefined and can be interpreted as either male or female.]

When Mark finds himself in a dark, mirror image of his apartment, unable to move and his body aching, a certain Darkiplier comes in and takes advantage of his weakness. MARKIPLIER X DARKIPLIER

Markiplier and Jacksepticeye go out for drinks with the guys and end up with more than just a hangover. #markiplier #jacksepticeye #septiplier ***Warning: Adult Content***

Player/Wilson erotic fan fiction.

Craig has a very interesting secret and Rick gets a little handsy trying to figure out what it is. That backfires on him spectacularly.

Craig is asked to do some suspicious maintenance on the gears of the boiler room and soon finds himself locked inside with some unpleasant company.

Post-game. As she regains control of Aperture, GLaDOS thinks of a far better punishment for Wheatley than floating through space for eternity. After being transferred back into his old human body and let loose in the facility, Wheatley vows to help Chell escape Aperture once and for all, but GLaDOS has other plans for the pair. Wheatley/Chell