The Doctor leaned out of the door of the TARDIS with K-9 at his side. "Well then, I'd better be off. Places to go, people to see. But we'll come visit again. K-9 likes you, and that's always a powerful motivator. Especially when he keeps harassing me."
John grinned. "Goodbye. I'm sure we'll keep busy until we next see you."
"I'm sure," replied the Doctor mischievously, looking at their entwined hands.
"He's not…"
"I know, just teasing. Anyway, I should leave now." The Doctor stepped back and the TARDIS doors closed behind him.
John looked at Sherlock as it faded away. "We're never going to see him again, are we?"
"Oh, we might."