As we've seen in the demo with Carbuncle, Noctis can have extremely detailed, lucid dreams. Why not take this a step further? Why not give him the ability to enter others' dreams when they're both sleeping?

Maybe Noct's been visiting Luna's dreams since they were children and they've kept it a secret, or maybe it's a recent development- either way I'd love to see some fluff or naughtier stuff between these two.