If Ianto had been the sort who was prone to panicking, he might have done so right about then. Something was definitely off about both the Time Lord and the TARDIS. Something was very wrong. As it was, he just felt a growing sense of unease. Which, in terms of Ianto, was pretty much the same as panicking. "Back to your old self?" he asked, as casually as he could manage. "And which self would that be?" Conversations with Jack after he returned from his time with the Doctor suddenly came to the forefront of his mind. Idle comments from Jack that, as always, were meant to tell the truth without actually having to tell.
Saxon went a little crazy...
...with a psychotic Time Lord. No, not the Doctor. He's not that bad.
...had a thing for being called Master. Went with the whips and chains.
Ianto stared at the Time Lord. That was why he had looked so familiar. He hadn't placed it before, but something had always seemed oddly familiar. "You're the Master," he said finally. Oh bloody hell. Jack was going to kill him when he got back.