Uninfested, Ianto mouths to himself, caught between confusion and skepticism, which manifests as a quirk of one eyebrow. Uninfested with what, exactly? Because Cecil sounds pretty confident. And surprisingly informed. But more to the point: "You arrived in the--" He catches himself, clears his throat, and continues at a more discreet volume. Leaning in a little closer, a little lower. "In the TARDIS? In the TARDIS library."

How did he not know about that? No, he's not pouting, he just - okay - he just likes to be informed of things. He takes a significantly longer drink of his whisky. "When was this?"