Undertale Multiverse Au one shots (Requests are closed)

Our Reincarnated Sister - Nightmare x Sister!Skeleton!Reader x Dream

(Inspired by "Oh My Dream Child" and "Kaguya the bamboo princess" and "A fight in the past." Also, image is not mine. Belongs to there rightful owner)

Warning, stabbing and bleeding to death is mentioned in this chapter)

3rd person's POV:

It was a calm and sunny day. The two brothers sat under the Tree of Feelings.

One side bears golden apples, while the other bears black apples. They were resting under the tree when they suddenly heard a noise coming from the tree.

It woke both of them up.

"Huh? Whats that sound?" Dream asked. Nightmare puts Dream behinds him and took a defensive stance.

Then they noticed that one of their fruits had been merged and is now glowing brightly.

Nightmare lowered his guard down as Dream walked towards the glowing apple.

"Dream!" Nightmare yelled, still caustious around the apple. The apple grew a little and fell.

Dream caught it. And something is starting to emerge from the apple.

"B-Brother!" Nightmare ran towards Dream, only to find him holding a baby skeleton.

"W-what am I supposed to do with this...?!" Dream asked. "Um, Um." Nightmare found a cloth and puts it around the baby.

Nightmare and Dream looks at it.

Its left eye resembles Dream's, and its right eye resembles Nightmare's. And has a strange mark on her cheek, just like the tree. (You know parable? His mark on his cheek is like Yours)

The baby cried. Tears began to emerge from both brother's eyes.

"Dream, are you crying?" Nightmare asked as he tried to wipe them away. "Um, no?" Dream answered.

Nightmare and Dream werent really crying, it somehow came from the baby.

"Brother, you think this is our sister...!?" Dream asked with excitement. Nightmare looked at the Baby and smiled along with Dream.

"I guess so." Nightmare said.

A few years later...

"Oi! Brother!" (Y/N) called. Nightmare turned to see both of his siblings run towards him like a bull.

"Whats happening?" (Y/N) asked. Her crown titled from her head. "I dont know..." Nightmare anwered.

Nightmare and Dream were surprised that (Y/N) grew quickly, but they didnt mind. As she is still quite shorter than them.

Then the monsters came close to the Tree of Feelings. "What are you doing?" Nightmare asked as he stood in a defensive stance.

"Were going to build a home here, we got the land lord's permission to do so." The monster replies.

"Your going to cut our tree, arent you?" (Y/N) growled. Nightmare hushed (Y/N).

When the monsters realized that it was the Tree of Feelings, they began to treat Nightmare and Dream like gods.

"I havent heard you two have a sister." One of the monsters noticed.

"She just came from...nevermind." Nightmare said. And the monsters agreed to not cut there tree and built their village.

The children will climb up and will ask to play with them. (Y/N) has never played with anyone except her brothers.

(Y/N) got along with the children quick like Dream, but she always find a way to hang out with Nightmare, since (Y/N) likes to read with him.