Do Dreams Really Come True? Dream!Sans x Reader x Nightmare!Sans

The Tale - Prologue

"Long, long time ago, there was a universe, in which one of the 3 vital trees of life lived, whose fruits were apples, half black, and half golden.

The black apples held the negative feelings,

Hatred.        Resentment.        Fear.           Wrath,    etc; 

While the golden fruits held positive feelings such as 

Happiness.       Hope.        Gratitude.        Entusiasm.       Faith,     and such.

Because Dreamtale held the tree of feelings within it, this universe produced negativity and positivity, which was then sent to each and every universe, so that life could naturally keep subsisting. Without the existence of the tree, no being could ever feel anything. Everyone would be like zombies, without any emotion of any kind inside of them, which is why this tree is so important and sacred.

However, there were some individuals who obtanied more negative feelings than what they should, and so intended to damage the tree in order to obtain the golden apples, since not only did they have power, but if you had one of them on your side, they would grant you enough confidence to do any kind of job without taking any failing risk, even if such job was bad, like for example.. 

Killing someone.

One of these horrible individuals was able to severly hurt the guardian of the tree, whose life was connected to the tree itself, meaning that if she died.. 

The tree would die with her.

The guardian killed the aggressor, and she was starting to feel repulsion towards the mortal being. Her only choice so that they wouldn't die was to fuse with the tree, and then she would save the life of it, but if she did that, the tree wouldnt have any guardian, its fruits then could be stolen with ease.

Scared because of all the blood she was losing, she decided to use the magic of the tree to bring all the positive and negative energies that she could, creating with these life.

Two light beings made with pure positive and negative energy, the little gold being was known as Dream since he was a dreamer and his brother, the dark purple being, was called Nightmare, only because he was the complete opposite of Dream. 

The guardian gave them two human bodies so that they could take them. But the energies were so big, and since there were nearly no escape routes, the bodies started to swell until they exploded. It was very disgusting. 

The guardian had to think fast, she had to fuse as soon as possible, so she explored with her mind other universes to find some vessel that she could copy and that it was suitable for those guardians. 

She found a small skeleton in a universe called Underswap, his name was Sans.

She hurried and copied the form of that skeleton into two empty replicas in front of the light energies, who took the bodies quickly, filling them with life. This time, the energy had many escape routes due to the numerous holes that the skeleton body could have, so it was under control. 

The guardian, now mother of the new guardians, then fused with the tree.

The small skeletons didn't have anybody, so they passed the days talking to eachother. They were brothers, they were always together. Even to cover the dry blood stain that remained on the tree, they created a yellow flag with a sun and tied it to the tree. 

Everything was happiness for them, as, after all, nobody approached the tree.

But Dreamtale started to get filled with more and more life... They created towns around the tree... 

And everything changed for the worse."