That had really not been what Castle had expected her to say. His anticipation was that after he told her it didn't matter if they had a baby or not, she would determine that she did not actually want one. Instead, he was taken a little bit aback by her answer.
"Really?" he asked. "You're sure? On the ship and everything?"
He just wanted to make damn sure, even though he couldn't hide the smile that was starting to form on his face.