If we are theorycrafting, I think Harry will make her commit to some sort of promise, similar to Laura. This promise will become the weakpoint in whatever relationship she builds with Harry, and is what Luca will abuse.
Luca is very good at seeing what makes people tick, while Harry tries to avoid looking beyond the surface behind people's actions. I think if there is no aggravating issue between Harry and Aya (Ex. The promise), it'll be hard for Luca to really work his corrupting magic and steal someone who is obsessed with Harry (Or maybe the idea of Harry?). Besides of course just "lol rape you like me now".
Luca is very good at seeing what makes people tick, while Harry tries to avoid looking beyond the surface behind people's actions. I think if there is no aggravating issue between Harry and Aya (Ex. The promise), it'll be hard for Luca to really work his corrupting magic and steal someone who is obsessed with Harry (Or maybe the idea of Harry?). Besides of course just "lol rape you like me now".