Curse Blood

Blood of the Past-Part 2

Kimetsu no Yaiba does not belong to me but to Koyoharu Gotōge .... I only do this for fun and hobby
Warning: This is an AU. I think there is a slight Out of Character, don't blame me! I am new to fandom.
There are also changes with the manga canon.

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It had been 3 years since Tanjiro and Nezuko's arrival at the infinite fortress, growing and strengthening to be of help with their father's ambitions. Much of the Upper and Lower moons (Needless to say which one I mean huh?) Became attached to this pair that they now consider family. In that time, many anecdotes are necessary to tell about those experiences of this pair of demon brothers but, it is better to count some necessary.

The first was in relation to food. Because they don't consume the same food as the rest of their species, they had to survive in 2 ways: His father's blood and sleep, the latter being something strange and unusual for others. The moons, above all a certain platinum blonde with rainbow eyes, tried by all means that they could eat the humans, but their failures were more and their success was null, so they chose to surrender. One day they decided to accompany their father on a mission to finish off a demon slayer as a study excursion type, however, unexpectedly, the father saved one of his lower-class "subjects" but, he did not have the luck to his side since he was quickly a victim of the brothers.

"..." Muzan was shocked, watching his sons tear the limbs of that demon, tasting like a saucer the flesh and blood of that creature that begged for help to be silenced by the girl since she cut his neck.

"You ..." Kibutsuji giddy whispers. He had to control his nervousness because of what he was observing: The cannibalism of his own species by his adopted children.

"It's delicious!" The brothers exclaim with joy, completely ignoring their father since they only wanted to satisfy hunger.

From there, Muzan noticed that there was a new way to satiate the appetite of his offspring ... although deep down it causes him to repel (All the moons weighed the same). He decided to accept that his children satisfy his hunger with his weaker followers that he believes was not worth it.

The second thing that happened when the brothers were barely 2 years old since they lived with demons and has a name: The incident of the bloody moon. It happened that their father gave them the first mission to carry out, being to finish off a squad of Demon slayers who were in the vicinity of the Red District, where is Daki's territory. That day there was a lunar eclipse, Tanjiro and Nezuko had been fighting with slayers of Kinoe and Kinoto rank, however things took an unexpected turn when a wind breath user cut off the pink eyed girl's left arm and the red-eyed boy's leg right. Seeing how someone you love is hurt by a stranger was the breaking point, causing them both to unconsciously gain power by transforming into larger versions of themselves. Nobody lived to tell the terror that the two demons caused, ruthlessly ending and tearing each slayer, bathing the place and themselves with blood but, the worst thing was that they lost their reason ... they were attacking each other despite the fact that they annihilated to a squad of 10 people.

Kibutsuji had felt that something strange was happening with his children so he went to see that it was his whereabouts ... the words died in his throat since those boys he adopted attacked each other like wild beasts. Why were they attacking each other?. He used his power to exert his control over them with his blood but it was useless, why didn't they obey him? They have their blood circulating in their veins, their own cells move in their bodies, he didn't understand. He opted for another measure and have Nakime call his 3 main moons and Daki who is nearby.