I thought about it some and the complaints about Vergil having been too young to father Nero can be called into question. We are all aware that cambions such as Dante and Vergil, due to their half demon nature, have certain things that are biologically different about them. Maybe one of those things is that they physically matured faster. If so, it makes it entirely plausible that Vergil impregnated a woman, or demon prostitute depending on what you think, at an age younger than we think. And, it is suggested that Vergil had visited Fortuna before so during that time frame he could have left Nero at the orphanage due to something having happened to Nero's mother and Vergil, being on his mission for power to protect those he loves, leaving him unable to care for the child. Vergil could have very well intended to return to his child until he thought he was going to die in the Demon World. This is just a thought and I'd like to read your opinions.