"Charles, Charles, Charles" he said quietly over and over for a brief moment, his eyes tracking the younger man as he stepped into the TARDIS. Now came the bit he always loved. He knew that look and he always loved seeing it. That amazement, seeing something new, experiencing it and learning. One of the things that made humans so bloody brilliant!
He tugged at his braces and smirked to himself. "Well... thanks" he said coyly. "Still love hearing it though" he added with a grin before holding his hand out in the same manner as Charles did but without shaking his hand. Just mirroring it as if that was how it was done. He took his hand away again and closed the TARDIS doors, locking them.
"So! You're a scientist, I'ma... Time Lord" he said, clapping his hands together as he started up the stairs towards the central column. "Yes, the TARDIS! of course... Lot's to see. Plenty in fact" he said, holding a finger up as if it were a point to make. He pulled a lever on the central column and a screen popped out. He quickly glanced at it with his tongue out and screwed his eyes up. "As I said before, Time And Relative Dimensions In Space, which means the inside of this magnificent machine is always much much bigger. There's a pool around here somewhere, and a library" he rambled.