AU Sans X Reader One-shots

Passive Nightmare x Corrupted Reader

Requested by @KellyCabre

"It happened again," Nightmare said sadly as he made his way to the tree, where you were sitting waiting for him.

He was pretty badly beaten up, and you were getting fed up with this. You've threatened the people who kept doing this to him, but he always managed to calm you down or hold you back.

You had a plan though, Nightmare didn't know about it, he couldn't, he'd never let you go through with it.

But you had to, it was the only way you knew to help him.

All you needed was to find them at the tree and they'd finally get what they deserved.

Nightmare and Dream had both told you about the apples on Nightmare's side of the tree, how'd they turn whoever ate them into a creature of negativity.

You knew what they would do to you, but you didn't care. You were blinded by wanting to help him, wanting to make him happy, or at least safe.

But in the mean time you had him sit next to you as you assessed his injuries, and then having him teleport both of you to his place so you could tend to them.

You had no idea how Nightmare would react once finding out about what you planned to do, you hoped he at least understand. You were best friends, possibly maybe a bit more than that one day, he'd understand, surely...right?

Unfortunately he next day he was under attack again, luckily though everything was happening at the tree, perfect timing.

You pushed your way through them to get to where Nightmare was, attempting to keep them back. You glanced at one of the lower hanging apples on the tree and grabbed it as quickly as you could.

"Y/n, what are you doing. You know what that will do to you," Nightmare yelled trying to grab your arm and take it from you.

"Trust me Nightmare, they won't bother you for much longer," you assured him as you took a bite, he let you go, either in shock that you actually did it or that he knew there was nothing else he could do.

Pain shot through you as your skin became a black, inky mess, several tentacles growing on your back, you even grew a few inches taller.

The white of your eyes faded to black and your iris's started glowing (f/c). Your hair also turned pitch black with (f/c) tints to it.

"Nightmare, what...oh my god," Dream said in shock as he finally made his way to the tree. You ignored him, instead you figured out how to gain control of your tentacles and used them to knock down or grab whoever you could in the crowd.

You saw something hit one of your appendages however, a purple bone. It was followed by a mixture of yellow ones as well.

Dream opened a portal behind you and Nightmare pushed you in.

And now, you were in an empty void...alone.

They must've figured you'd be no threat there, they were wrong. It didn't take long for you to learn how to use the skeleton like magic that you gained.

You learned how to go from world to world, you'd known about alternate universes, not much, but you knew about them.

That meaning you had other chances to take your anger out. You were mad, no, enraged. You lost your best friend, your home, and frankly your humanity.

But more than anything you felt betrayed, Nightmare didn't even think twice before attacking you, a good friend would've at least heard you out.

But at the same time, you loved it. You loved the negative emotions, both your own and others. You usually tried to forget your past and focus on terrifying others, but that also came with a set of problems.