"I told you," the Doctor replied, casually. "It's a birthday gift."
He knew that wasn't going to be enough, so he stood up and walked over to her, tenderly taking her one hand with both of his. "Seeing you Missy, has brought back fond memories, and some of them not so fond. For that reason, I wanted to give you something special." He then shrugged. "They'll always complain, but they'll never understand the relationship between us. Not really."