True King of Underworld/Hell (Anos/Lucifer Reader x DXD Harem)

Well, the True Demon King is back The Demon King of Tanary the Lucifer or the Claimed Lucifer is not the reason the Devil exist they are just an off-brand weaker version of Demons. The Biblical book barely mentions Demons for many reasons but the biggest is the return of the King of Tyranny. He is Y/N Anos-Lucifer Voldigaod-Morningstar. What will happen when the demon King returns to see the Demons are creating a new race called Devilwek does at that?