"We always said no one becomes a Morlock without good cause." More creme from the container, which was then set down on the floor. "I guess you could say no one starts them without a better one." David looked up with a smile, though his hands kept moving.
"I can't blame you for being curious. I set myself up for it with the mysterious lead-in." And really, if he'd known he'd been about to reveal a piece of his past, David really wouldn't have led in with something about secrecy. Ah well, hindsight, 20-20, until he went to work on it. "I think, though, that's all I'm going to say right now."
Throughout it all, David's expression remained light, if slightly wry, no sign of effort to keep it that way. Either he genuinely didn't mind, or he had a lot of practice with repression.