Above the Heavenly Dome, in the Sixth Layer of the realm beyond the heavens known as the Sixth Heavenly Demon King's Transformative Self-Mastery Heaven, the Sixth Heavenly Demon King ruled as the sovereign of all demons, reveling in the joys and karma of the five other major Desire Heavens of the lower layers.
The Demon King resided within the Demon Palace, accompanied by five hundred Witches (the so-called Witches were the daughters of the Demon King), possessing the closest Mana and status to the Demon King himself.
Of course, Heavenly Demons themselves had no gender distinction, nor did they have the function of marriage or procreation; therefore, these Witches were generally believed to be splinters of the Demon King... akin to bacteria.
It was just that the Witches usually preferred to transform into beautiful human females, which was why they were called Witches.