"That you tried at all is quite a good first step." And he tried it for him. Just remembering that is more than enough for Ignis to think of that light inside of him, now, feel the way every bit of it curls and brushes up against the inner chambers of his heart.

The loft, now, and Ignis allows Noct to get the door, since his own hand is free. "Ah, that reminds me - where is your spare key? The Armiger, or elsewhere? I'll need it by tonight."

Presumably the only reason he didn't already take it is because of this lack of knowing.