They haven't spoken of it. The book.

This glancing invocation doesn't bring tension, but a sharpening of Louis' gaze. Attentive, scrutinizing Lestat's expression for any sign of temper before he answers.

"We can talk about if, you like," he offers.

A heady topic to cover on the heels of San Francisco. But Louis is willing. If it is near to Lestat's thoughts now, and he would like to proceed past this light nudge—

Yes, Louis would indulge him. He owes that to Lestat as well.