The Doctor liked early morning noises in the TARDIS. The way the engines were running not-quite-smoothly after a night of hovering, the comfortable silence which fell around the Doctor when he had no need to prove himself clever and be talking out of his elbows, so he could just sit down and think. More than anything, he liked the sound of yawning and stretching; it meant that Rose was awake.

"Good morning, Doctor," she said sleepily, entering the TARDIS's console room.

"Morning, Rose!" he greeted, cheery as ever, jumping from this control to that. Rose recognized his excitement as a prelude to another trip somewhere.

"Where are we going, Doctor?" she asked.

"Home," he replied simply, pulling a lever here, pressing buttons there.

"Home? As in London?" she wondered. The Doctor nodded. "Why?"

"I thought you might want to go home for a while. To celebrate," he clarified.

"Celebrate what?" Rose asked. The Doctor stopped moving for a while to look at her. She couldn't quite pinpoint his expression.

"Valentine's Day, of course. In your timeline, it must be somewhere around mid-February, so I thought maybe you would want to go back and take someone out for chocolate and coffee and whatever it is that is so attractive of hotel rooms…" he explained.

Rose giggled. "You want chocolate and coffee and hotel rooms?"

The Doctor frowned in confusion. "Not me. I thought maybe Mickey or…"

"Mickey and I are not… like that anymore," she replied, quietly wondering how her ex-boyfriend was doing.

"So you don't have a valentine?" the Doctor asked, cocking his head to the side. When Rose shook her head, his frown grew more pronounced. "That's not right. Every pretty girl should have a valentine."

"Is that an offer, Doctor?" she laughed.

"If you want to," he answered, shrugging.

"Okay," she said. "You can be my valentine, then."

"Great! As your valentine, I must offer you a fun-filled, romantic day so… how would you like to visit a planet that is inside out?"

"Inside out?"

"Yes. It's a lot like Earth, except that everything humans would consider precious –like diamonds and gold- are on the surface, and the forests and lakes and towns are inside the planet. It's got a massive touristic appeal, and at this time of year, their sun turns pink," he said, spouting out facts like an encyclopaedia, as excitedly as a child.

Rose laughed. "Sounds good to me!"

The Doctor smiled, and after pulling a lever on the console, they were zooming off into the time vortex. Before long, the familiar whirring sound announced their arrival.

"Say, Doctor, what's the name of this planet again?" she asked. The Doctor pulled a few more levers to park the TARDIS, his eyebrows fusing together again.

"Umm, I…" he started. "I can't really tell you."

"Why not?"

"Because the planet's name can't be pronounced unless you kiss someone."

"Oh."

"On the lips."

"Oh!"

"With tongue."

"Oh…" Rose bit the inside of her cheek, embarrassment making her blush. She felt better at once when she saw that the Doctor, too, was blushing. "We've arrived, then?" she asked.

"Yes, yes," he replied, thankful for the quick topic change. He strode over to the door, holding it open for Rose. "Ladies first."

Rose stepped out of the TARDIS. The beauty of the planet left her breathless.