mui and yui

i don't know their names but muichiro and his brother both managed to survive the demon attack when they were kids and now they work together until one day, muichiro was turned into a demon and his brother is the mist hashria for him, but muichiro is a nice demon like nezuko. characters: tanjiro nezuko muichiro his brother senziro(flower hashira my oc) rengoku giyu shinobu and tengen. ships: rengoku x tengen, giyu x shinobu, senziro x muichiro's brother (dont Drudge me for not knowing muichiro's brothers name okay and you are also muichiro's brother)