'Risa becoming a vampire progenitor?' Nathan was shocked. If he could really create a progenitor with his blood alone, it would change the balance of the world.
People would think they had to kidnap him and extract his blood to nurture a group of vampire progenitors. A lot more people would summon a vampire because there was a guarantee of success.
In fact, this could be a profitable business because he could sell his blood for enormous wealth. However, it would endanger his life.
He believed the vampire progenitor was standing toe-to-toe against the likes of the Fairy Queen and the draconian.
Announcing this to the world would simply bring those people out to hunt him.
On the other hand, this would definitely be useful for Selena. If Risa could actually become a progenitor, Selena would be the third summoner who had a vampire progenitor after her father and ancestor.