[Zero almost second guesses himself in that maybe he didn't hear him speak; it wouldn't be the first time that's happened even in a general sense. However then comes the state of being both at a loss, thrown off. . .but most of all, he wasn't prepared. Far, far less than he had been with Ai, maybe simply because there's a slight difference. Because there is absolutely no need for him to question who is standing before him.
Even while at the same time, he still has no idea where to begin.]
Yeah it's. . . really disorienting.
[Albeit far less than this moment. He knows already that the other is not lying.]
A son. . .
[His brows knit, though, because Zero is already positive of the way he'll react to hear such a (painful) question.]