User blog comment:Drkness231/Mamono One-Shots S2! Chapter 6: Minotaur/@comment-25118681-20150428030157

I'm guessing this prince isn't the heir since he would be unable to produce a heir with his wife unless:


 * This is long after the demon lord made it possible for monsters to give birth to male humans.


 * The politics of the kingdom doesn't care about gender and allows females to be the head of the country as well.