Demon king Tanjiro

Your Nezuko and your turn back into a human and Tanjiro got turned into a the demon king at the final battle against Muzan and every hashira (except Giyuu and senemi and Tengen) are dead and demons can regenerate their limbs but Tanjiro was the kindest and nicest person in the world and now he’s a demon and no one what to hurt him because they love him (as a friend) and Tanjiro is your brother and in the past you are a good demon you fight demons and you still half demon your strongest demon but Tanjiro is stronger and you don’t want to hurt him because he your brother you came late and you seen everyone crying and Tanjiro is a demon and he bites you and he can’t control him self but Nezko is protecting everyone but Tanjiro doesn’t care he just lays attacks on everyone except Nezuko