It's always precious to him to see that smile and he loves the fact that Madoka is leaning into him after it. But he looks in surprise to Madoka that she's saying he forgot someone regarding being made of magic.

"If I've left anyone out, then that would be you." After all, it was her unflagging strength and faith that got him through one of the darkest times of his time on the train here. Ignis would never ever forget how she spurred him on to keep going.