He winked conspiratorially, "Your secret's safe with me."

Oh she knew some interesting people, this Rose Tyler. He was going to have to keep an eye on her. "Just how many time agents have you known, then?" He smirked. "Oh what's to tell? I worked my way up through the ranks. Now I travel the universe, seeing the sights. Taking the odd job when I can." He mentally thanks Jack for that line. It's going to come in handy.