You

You, the demon king of a kingdom buried deep underground. In a deep sleep, rich mining humans broke your deep sleep, you woke up, leading the demons to destroy humanity, modern weapons of humans are useless against the power of demons, demons worship you as the strongest demon lord.

after a few years, you finally conquered japan, and where your castle is, the tall buildings become dilapidated and old, the men are killed, and the women are left only to be used as toys, sex slaves, or baby-making machines.

Demons replace evil human men for humans to survive, a place without laws, women can be raped at any time by demons, pregnant with demon children

in the devil castle, a maid is sucking your cock, you sit calmly on the throne, expressionless looking at her sucking your cock, your cock is more special than the devil's because once you put it in a woman's pussy, they will love it and feel addicted to it