The son of the demon king

Baby tanjiro

Muzan kibutsuji, the demon king was walking through the snow wearing a expensive suit and fedora that would immediately announce his class in society but even though the cloths offer no warmth to him

The cold weather didn't bother him as he saw in the distance a small house and a man with long red hair and carrying a basket full of coal saw him. Eyes widen before he pulled out an axe and stood in front of the his home

"Stop right there muzan!"

Muzan stopped as he was a bit cautious as these we're the descendants of yoriichi, he decided to use his incredible speed and cutting powers to slice the red haired man's body into tiny pits killing him instantly

Muzan then walked in the house and saw a women run into a room probably to escape and he slowly walked through the hallway and enter the room the women ran into

He saw her and immediately killed her by slicing her stomach and neck, muzan wondered why she ran into this room but heard giggling, he saw a baby in a crib

Muzan now realized that the women tried to get her baby to safety but he killed her and now he was all alone with the baby, the last of the kamodo's and he could end his threat once and for all

The baby giggled and reached out his hands to muzan as muzan was a bit surprised that a baby was not scared of him, most people and demons are scared of muzan but yet this baby is smiling at muzan

Muzan picked up the baby as he saw in the corner of his eyes toys that had written names on all of them with all the names being named 'tanjiro kamodo'

"Hmm......so his name is tanjiro"

Muzan said to nobody in particular and notice the room was quiet so he looked at the baby in his arms and saw him sound asleep with his thumb in his mouth

Muzan for some reason felt a warm feeling in his chest looking at the adorable baby in his arms, he hasn't felt his feeling in centuries that he forgotten this feeling

Love, he hasn't felt that feeling in far to long that he smiled, a real smile but not like his other smiles that were fake or for fear but a real smile. Now he thought of something as he grinned

He shall raise this child and make him a spy for his plans to take down the demon slayer Corp as well as take revenge on yoriichi by making his descendants a agent to his worst enemy

Then muzan called upon nakime, instantly he was now in the infinity fortress as he told the upper moon to make room for tanjiro

"Make a room for tanjiro, make sure it's well hidden and it has everything for a child"

The women nodded and played biwa as a room moved to the platform they were on and opened to reveal a room with a crib and several equipment for a baby

Muzan walked inside the room and closed the door behind him as he walks over to a chair that was near the corner of the room, he sits in the chair and hears tanjiro waking up and smile at him

He grabs muzan's hair and giggles lightly which warms the demon king's heart, then tanjiro startled to babble and gestures to his mouth

"Do you want food?"

Tanjiro immediately smiled at that as he jumps up and down, muzan then walks over to a cabinet and opens it to get baby food for the baby, he then starts to feed tanjiro and the infant yawns before laying his head in muzan's chest softy snoring

Muzan smiled before he stood up and placed the baby in a crib and covered him in a blanket keeping him warm, muzan was surprised at himself. Here he was killing the last if the kamodo's and now raising the last one