Castle exhaled slowly. "There are still pros and cons, I know. I honestly think we have less of a chance of dying here, though one of us could disappear at any second. If we did have a child here, they'd be brought up on the Enterprise, and we'd discussed the fact that having grass and fresh air would be at a premium for them."
He obviously really wanted a child with Kate, but he also wanted to make sure that they had fully hashed out everything and come to the best decision that they could make.