The Master beamed, his eyes nearly closed. He could have been a cat that had gotten into the cream. "It trusts me," he agreed, stowing the sonic in an inside pocket of his jacket. "Not really a conventional relationship, of course, but we make do."

He glanced back at the Doctor, wondering what he was on about and what he meant by 'the entire time'. Certainly it had been on Gallifrey during the Time War, though it had taken some damage that had been mysteriously missing when the Master had happened upon it in Taxon.

"And 'no way to tell' means exactly what it sounds like, you do realize." He had asked, of course, but the House hadn't been able to tell him. It hadn't even understood the question.