He told Annabeth in September, sitting in the library at dusk with the camp quiet around them.
He had spent a week thinking about how to tell it — what order, what level of detail, which parts she needed immediately and which could follow. He had thought about her: eleven years old, the sharpest mind in any room, someone who organized information into patterns and used patterns to act. She needed enough to understand the shape of what was coming. She did not need to be protected from difficulty.
He started with the transmigration. He had decided that was the right place to start — not because it was the most immediately relevant thing, but because everything else he was about to tell her derived from it, and she deserved to know the source.
She listened without interrupting. She had always been good at listening without interrupting when the thing being said was worth listening to. Her grey eyes were steady and he could see the pattern-recognition happening in real time — not disbelief, she was past disbelief quickly, too quickly for it to be performance. She was already building the architecture of what he was telling her, fitting it against everything she had observed about him for two years.
He told her about Jason Park and the mythology study and the five books. He told her about the transmigration and the Chaos Codex. He told her about Hecate's crossroads bargain and the sealed blessing and the dual claiming's real source.
Then he told her what was coming.
He was careful here — not performing care, genuinely careful. He gave her the shape without the full specificity. He told her: a son of Poseidon will come to camp next summer. He told her: the Lightning Thief plot, the broad outline, the theft and the quest and the resolution. He told her: you will be involved, and your involvement is crucial, and you are going to handle it exactly right, and he is telling her now because she deserves more than twelve hours to prepare.
She was quiet for a long time after he finished.
Then: 'You've known me for two years.'
'Yes.'
'And you knew what I was going to be involved in. What role I was going to play.'
'In broad outline.'
'And you didn't tell me until now.'
'No.' He met her eyes. 'Because I was worried — am still worried — about the difference between knowing your role and living it. If you had known for two years that you were going to be on this specific quest, you might have spent two years preparing for a character rather than becoming a person. I didn't want that. You're more than a role.'
She looked at him for a long, very long, moment. He could see the anger in it — the legitimate frustration of someone who has been operating with partial information while the person sitting across from them had more. He did not flinch from it.
'That's a decision you made for me,' she said.
'Yes. I know. I might have been wrong about the timing. I think I wasn't, but I could be wrong.' He paused. 'I'm sorry for the cost of it.'
Another long silence. Then: 'Tell me everything you remember about next summer.'
They talked until the library's lamps needed lighting. When they finished, she sat back and looked at him with the grey eyes newly calibrated — not the eyes of someone who had discovered a betrayal, but the eyes of someone who had received a very large piece of information and was already organizing what to do with it.
'Don't do that again,' she said. 'If you know something that affects me, I want to know it in time to act.'
'Yes,' he said.
'I mean it.'
'I know you do. I agree with you.'
She picked up her stylus. She had already started making notes. He watched her and felt something that was not quite relief but lived near it — the specific relief of having given someone the real version of things and having them handle it exactly as you hoped they would.