She knew the answer, though she didn't like it. He knew the answer, too, but she didn't begrudge him his frustration. "Because it's not just us," she would explain, again. "It's Harry that's in danger, too." She didn't mind answering it over and over, because she needed the reminder. She sometimes suspected that James was doing it on purpose, because he knew she was frustrated too, and he was afraid she might run back outside to the battlefield, to fight. (She might have, even, if she hadn't known he would follow.) It was easy to pretend, when you were behind a Fidelius Charm, that you were not in danger. Little Pete would never betray them, and he shouldn't need to fight, they hoped; no one would even consider that they hadn't made Sirius the Secret-Keeper. So long as they stayed put and didn't do anything stupid, they were perfectly safe (keep telling yourself that, maybe that'll make it true).