Undertale & Deltarune Oneshots

☆Nightmare's Little Assholes- Bad Sanses

Plot: When Nightmare decides to wreak havoc in a random AU, he ends up finding several psychopathic children along the way. Finding them humorous, Nightmare adopts them and learns that not only are they evil, but little shits as well

Requested By: Echo51311

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Nightmare laughs maniacally as he watches the fire he caused spread throughout the area. He was having the time of his life listening to the screams of the innocent. He wandered through the debris, admiring his own work when he saw it. A small, glichy child tying some children against a nearby wall using...strings coming from his eyes? Whatever, it's not like he want any less weird. Eventually the child noticed him and smiled.

"Youre the guy who started this, right?" He asked, his voice more childlike than Nightmare expected. Just how old was this kid?

"Uh, yeah," he said.

"I'm Error. Mind if I join you in whatever you're doing? Im a bit bored at the moment," the child asked. Nightmare thought for a moment before shrugging his shoulders.

"Sure, why not?" Nightmare said, watching as Error rushed over and stood next to him, but not too close, though. Nightmare appreciated that. They then continued on his journey through the debris.

As they walked, Error would help Nightmare move some debris with his strings, and Nightmare had to admit that Error was extremely useful when he would tie people to random objects whenever they got in his way. He was starting to like this kid.

Eventually, much to Nightmare's surprise, he stumbled upon another kid. He had a giant knife like sword in his hands which seemed to be extremely powerful when it came to attacking other people. Error seemed to recognize this child, as he looked at Nightmare and spoke.

"That's Cross, he doesn't like many people and usually keeps to himself like me and my other friend. Try not to spook him or else he'll attack," Error said cautiously, which made Nightmare wonder if this kid had actually killed someone, maybe Error helped him. Then again, who was he to judge?

"Fine. Think you can grab his knife, sword, thing with your strings?" Nightmare asked, not wanting to deal with a trigger happy, or in this case knife happy, child.

Error nodded, focusing on his strings and grabbing the knife with ease just before Cross made another attack. He quickly turned around to see who had messed with his plan, only to relax a bit when he saw Error. He sighed and walked over to them, his voice quiet yet annoyed.

"I should've known it was you, Error. Can I have it back?" Cross asked, holding his hand out for Error to drop it into his hand.

"Sure, but only if you don't attack this guy, he's the one who started all of this," Error said. Nightmare didn't saw anything, instead watching as Cross looked him up and down before sighing.

"Fine," Cross said, catching his knife when Error dropped it before pulling up his scarf to cover his mouth. He decided to walk on the other side of Nightmare, which he didn't mind at all. These two seemed relatively calm, definitely not plotting to kill him at any moment. Besides, Nightmare would win that battle anyway.

They continued walking, and Cross ended up proving to be rather helpful as well, killing the people that Error tied up while leaving Nightmare on his own to do whatever he wanted. Eventually they decided to move on once they tapped that area out, leaving it in ruin.