Oh, Soldat. Sora already knows that they're best friends! Silly. What kinda secret is that, anyway? It's not like they could possibly ever have anything else to hide, even if Crowley is trying to stay cagey about something Aziraphale told Sora not to be nosy about. Sora's pretty sure that that's the thing. Introverts can be so shy.

"Was he a secret agent or something? Or like... royalty?" Sora nods. "Those would be pretty lonely, I guess. He's lucky he had Aziraphale to keep an eye on him."