Imadoki Battle Fantasy ~Yuusha to Maou no Dousei Seikatsu~

The protagonist is the descendant of the hero who defeated the demon king thousands of years ago. One day, his sexual desires have begun increasing, and the holy energy of the hero inside him has begun to reappear. If left unchecked, it would start another war between the humans and demons. To suppress his holy energy, the tribes of various groups prepared girls who would give him sexual treatment in the event his desires begun to resurface.