He blinks and glances away, giving a small cough. "Well, I should stop monopolizing your time, and smuggle my cake back out...before my fiance wonders where I am. I hope you and your granddad enjoy the observatory. And anything else you do here." He shuffles his items awkwardly to one hand, and reaches the other out to shake hers. "It was pleasure, Donna Noble. Maybe...we'll run into each other again."