Luna woke up in her bedroom at home, which was a situation that she instantly did not trust. She checked under the bed and in the cabinets and everywhere that she could think of to find a sign of the Great Intelligence's trickery. Then, she checked her mind. The lurking shadow that had been present for such a while, now, seemed to have gone. She felt...healthy.
"Luna!" a voice called out. "Luna, darling? Are you awake?"
Luna descended the staircase to find her father, Xenophilius Lovegood, pouring three cups of tea. One was set aside for her, one for her father, and the third...
"Mr. The Doctor? What's happened?"
The stringy man was gleefully (and most ungracefully) sipping from his own cup, but stopped abruptly once he saw Luna. "Alright, there, Luna?" he asked loudly. "I was a bit worried for a moment. You took quite a fall on that hillside." The way he emphasized his words emphatically and winked after speaking made for what had to be the least subtle lie Luna Lovegood had ever heard, but she went along with it.
"I suspect it was wrackspurts," she said sagely. "I've been out of sorts all day."
"Well, at least Mr. The Doctor was there to carry you back," Mr. Lovegood answered brightly. "But you should be more careful, darling. I have taught you how to get rid of wrackspurts. You just have to be quick enough."
Luna nodded absently while drinking her tea. She couldn't imagine how Mr. The Doctor had managed to put her father in such a good mood, but there it was, and she was grateful for it.
She never got to ask for an explanation that day as to what happened in her mind; the time lord left just as swiftly as he'd arrived.
...
The second time Luna Lovegood saw Mr. The Doctor, she was eleven.