The Doctor very firmly put a door in front of a memory that wanted to appear with Jack's question. No time for those distractions, certainly not in their current situation. The TARDIS, he imagined, would probably be terribly insulted. Still...it could be fun. And the Doctor did promise himself that there'd be more fun with them.

He leaned up with the kiss, gently pushing Jack backwards toward the bed, so the Doctor could move on top. As he moved, he brushed his mind along the nerves up and down Jack's legs, starting at the feet and moving upwards in long, sweeping motions, like a paintbrush. Jack was more experienced with the physical, but the Doctor knew his stuff psychically.

Which was not to say that he wouldn't be physical, too. He broke the kiss and slowly began tracing his lips down Jack's throat.