Hashiras - you, Tomioka

–You (Tomioka) were in the Infinite Fortress before all the other Hashira and Tanjiro fell in there!?–🌊 |KokuGiyuu| ~•{Warning; MY AU where Tomioka and Kokushibo are friends (and maybe something more) and Tomioka is Muzan's son but the others don't know}•~ -oh and all the Upper Moons are alive in this AU-🌕