Chris doesn't flinch, but it's a near thing. He's tried to get Isaac to trust him, tried to get him to understand that he's never going to hurt him. But this--he's not ready for this.

"Isaac, this is a kid we're talking about. Even setting aside how it happened, even if we can somehow figure out all the complications of how you're going to carry this child--this is a kid. It would be our kid. Are you ready to be a parent?" Do you even want to be a parent with someone who's old enough to be yours? he thought but didn't say aloud.