User blog comment:B214/General Discussion/@comment-24098614-20170607003359/@comment-30924344-20170607005118

Let me give you a fact even in fiction: There is no such thing as forcing nature successfully. Koneko can have a child yes, but she along with the baby will die because for nekoshou, having a baby at Koneko's age is a no-no because compared to a human of the same age, her biology doesn't allow child birth; she is not in terms of her species at the childbearing age. For human women it's between the ages of 15-44 years old, but for nekoshou, the age range starts much higher so probably from late 20's. Koneko does have a child with Issei in 15-20 years later so the age range starting from say 25 is plausible.