Billy could tell others if he wanted - he didn't mean to request a secret. But as he considers saying so, he chooses not to. Really, Kaworu appreciates that he even offers. And it's more this meeting itself that he would want to stay between them, not the bare information that was disclosed.

"I will," he affirms with a smile. "But, when you're ready, please try to keep opening up to others. A Lilim's salvation from his misery lies in trusting and caring for each other. If you're feeling unhappy, talk to somebody - and not just me."