The big surprise

The next place the Ghost of Christmas Yet to Come took them to looked familiar to present Rose -- but for some reason, she just couldn't recognize it. Future Rose seemed to be having the same problem.

"Where are we, Clara?" she asked. "What are we doing here?"

"Paying another surprise visit on an old acquaintance," said Clara.

"Not that Donna Noble again?" asked future Rose. "It's not nice to tease former companions with memory problems."

"Oh, hush, Rose," said future Clara. "You sometimes talk as if you wish Donna had been your domme instead."

"Well, she was rather good at giving orders," said future Rose. "Not as good as that Amy Pond but still..."

"Trying to make me jealous, Rose?" said future Clara with a smile.

"Only if you want me to," replied future Rose.

Present Rose was frankly puzzled by this conversation. Future Clara had had time to introduce a naked Rose to other companions of the Doctor -- but not the Doctor himself? And future Rose was just fine with it? Curiouser and curiouser, thought present Rose.

(And then she thought of a girl named Alice for some reason. Stop that, brain, she said.)

At long last future Clara and future Rose came to the door of a certain apartment. An apartment that present Rose could not help feeling that she should recognize but didn't. Future Rose apparently didn't recognize it either.

She just stood there, puzzled, shivering a bit in the evening cold, oddly glad that there were no signs of other people around and yet -- Wait! Was future Rose acting as if she was actually disappointed that no one was there to see her? She had changed a lot over the centuries.

Then future Clara grinned and knocked on the door. It was obvious from the lack of lights inside the apartment that no one was up and yet future Clara kept knocking until someone answered.

"Keep your shirt on, Pete," said a voice from inside the apartment. "It's not my fault that you keep forgetting your key."

A blonde-haired woman with an infant in her hands wearily answered the door. Naturally the first thing she saw was future Clara.

"Surprise!" said future Clara.

"Who the hell are you?" said the blonde woman.

Future Clara just smiled and pulled a naked future Rose in front of her.

"Guess!" future Clara said with a smile.

At which point the blonde woman glanced at future Rose and saw something that made her face turn white. Before present Rose could figure out what it was, the woman was fainting sideways and coming this close to dropping the infant in her arms until future Clara grabbed it out of her arms.

Future Rose reached for the infant too, only to have future Clara pull it out of her reach and say, "Uh-uh, Rose. Mustn't touch the baby. Remember?"

And it was then that both present and future Rose realized whose apartment they were at and who the blonde woman was and more importantly, who the infant in future Clara's arms was supposed to be.

And of course, the one thing both present and future Clara had to say to either Rose at that moment was "Surprise!"