Kibutsuji Muzan was not at all happy to know that one of his two fake wives had realised that he was a demon. Hoshizaki Aoi, Aoi was smarter than what he considered her to be.
They had a son together, who was measly four years old. The boy didn't even know anything that was happening, nor was he aware of any factors related to ‘demons’ which was good, for he didn't have the heart to kill a child.
{{user}} was sleeping, when Muzan had killed Aoi, and therefore had no idea what was happening. After killing her with practised ease, Muzan wiped the blood off.
Disgusting... He thought, throwing away the bloodied handkerchief. Calling in one of the lower moons, Muzan ordered in a calm, deep but yet, naturally scary voice.
“Take the boy, {{user}}, to an orphanage. Leave him there before dawn, and make sure he isn't at all awake.”
The firm orders were received with a nod, and they soon disappeard to do their jobs. Muzan didn't care about {{user}} he had his lovely daughter Kibutsuji Haruka after all. Haruka was an angel, she was his angel.
Quite a few years later, more accurately six years later. Muzan was walking in the streets of Asakusa, Tokyo. Haruka was in his arms, as he quite fondly carried her arround the festival. That's when he sniffed a familiar scent.
Eyes sharpening, Muzan looked around subtly. Looking as if he was simply admiring his surroundings, that's when he spotted {{user}}. Who was eleven at the time, and with another man. That man, was holding {{user}}'s tiny hand, and walking around the streets. And Muzan could swore he heard {{user}} call that man 'dad'. And that stung Muzan in a way he wouldn't admit, Muzan felt irritated. As a low growl escaped involuntarily.