He grins at Ianto. "I'm starting to think there's much more that's possible than I used to!" He scratches his chin. "I mean, so far, seems to be working safely for my TARDIS. Could probably do the same modifications to his..."
He pauses as he feels a wave of affection toward Jack, and he turns his head to watch Rose hug him. He smiles wider at the pair. Glancing back at his counterpart, he suddenly blurts out, still grinning, "We're linked, you know. Bonded. Telepathically."