"I could create a reading list," he says, almost a bit dry, "but I imagine you've read most of the books I would recommend." Har har, Lucius.

Coming in a little further, he considers his older self. "If you were curious about what I was doing, you could have simply asked." He is doing his best to rule his temper; no one else (possibly Narcissa) would notice even a hint of it, but he always feels he's at a disadvantage with this man.