One morning, because he could, Jack came into the control room completely naked.
Stark naked. No shirt, no trousers, no pants, nothing, not even a pair of socks to keep his feet warm, which, understandably, were becoming chilled upon the metal flooring of the TARDIS.
The Doctor, foolishly, did not look up, but continued busily tinkering with his sonic screwdriver. Jack had often wondered if it had a vibration setting, and now believed it had, since the Doctor was still looking down and not at him.
"Doctor," Jack said, standing proudly. "I demand that you become naked."
"In a minute..."
This Doctor Who story was written by Kate Bolin. If you liked it, there's plenty more at http://www.dymphna.net/fanfic/. And you can feedback her at dymphna@dymphna.net.