Never ending torture

Muzan is in charge of one of the strongest mafia in Japan he has studied on people to make them super human till one day he is successful on a boy named tanjiro kamodo he and the upper moons who are not demons raise him to fight and to one day rule the mafia till he was out on a mission and saw another mafia and decided to follow them getting into a fight and unknowing finding his lover( not the best at descriptions moder au zentan if my friends find this I'm dead🥲)