Kitsune were beings unlike most that fed through dual cultivation.
The reason was because of how their bodies were made naturally.
Unlike other beings of sexual hunger, a kitsune was known to literally have two pussies. The reason was actually a really complicated one.
Firstly, unlike other demons that gave birth to their young and mostly discarded them, expecting them to survive on their own, Kitsune were different. They were nurturers by nature and instinct.
For this reason, they had two pussies. One for the sake of draining men and the second for birthing children.
The idea of it was to not taint the child, allowing them to come into the world pure and nature red that way.
In fact, there were rumors that at their core, kitsune should not be demons and survive merely on yanf energy from men.