This is a Doctor/Martha romantical thing - I felt like writing it because at the moment Martha is my favourite companion.
"Alarm bells ringing, are you listening?
On the ARC, snow is glistening.
Aliens can bite,
We're hungry tonight!
Daydreaming of my Gallifrey!"
Sang the Doctor, in the familiar tune of Winter Wonderland; he was contentedly dancing with Rose.
"Where's Martha?"
"I'm actually not sure, you go find her and I'll dance with some of the kids!" Rose laughed; The Doctor ran out into the dark, snowy night to look for Martha.
Martha smiled guiltily at The Doctor, she'd made the switch – She let him wear her shoes and she was wearing his. His shoes were indeed comfy, very nice, although they were a bit ratty.
"Oh, come one, love. Seriously?" The Doctor pranced about the TARDIS in her black heels, grinning like a freak.
"Yes!" She made note of the early mistletoe growing in the eaves of the TARDIS, as she adjusted his heels. The Doctor saw the mistletoe, and remembering how sad Martha actually was, bent down to kiss her softly, just to try it, maybe he could get over Rose – He and Rose couldn't be together forever. Martha was shocked by this odd kiss from him, but she responded like she had never before; she stuck her tongue in his mouth to get a sense of what was going on. His hands were on her waist, and she placed her hands around his neck, deepening the kiss. Suddenly, he broke away, breathless.
"I think we should restrict this until later, once Rose is home." He breathed, Martha grinning madly, nodding only a little. He walked towards the door of the TARDIS, still in her heels, and he turned to speak with her.
"Merry Christmas. And you look just stunning! Allons-y!" And he just left, leaving Martha ecstatic by completely confused.
"What's up?" Rose asked Martha. Martha smiled and just walked away. Rose wanted to get to the bottom of this. But maybe another night because she was hyper on punch and everything swelled, and she might say something stupid. Before she curled up and went to sleep, she noticed that The Doctor was wearing heels, not odd.