So, we know that Prompto was earmarked as an MT from an early age, despite (or because of?) being the son of the head of the program. But what if Verstael wanted his son to be more than just another nameless soldier in the infantry? What if he wanted him to become the greatest MT weapon ever created?
For this prompt, Prompto was never rescued from the MT program, and ended up becoming one of the Empire's most powerful and feared assets. Inevitably, he comes into contact with Noct and his two allies. Somewhere along the way, Noct figures out that there's a person kicking around inside him somewhere, and he tries to liberate him from the Empire's control. It works.
tl;dr Verstael is the Hojo to Prompto's Sephiroth; Noctis and co. fight him and then save him.
Prompto as a Super MT (optional Noctis/Prompto)
For this prompt, Prompto was never rescued from the MT program, and ended up becoming one of the Empire's most powerful and feared assets. Inevitably, he comes into contact with Noct and his two allies. Somewhere along the way, Noct figures out that there's a person kicking around inside him somewhere, and he tries to liberate him from the Empire's control. It works.
tl;dr Verstael is the Hojo to Prompto's Sephiroth; Noctis and co. fight him and then save him.