Nothing changed. Or rather, very little changed, to an outside observer. But they both noticed it, the way his eyes darkened slightly when he watched her at dinner. And how he would sit next to her in the library, at one of the far tables, though he had finished his homework already.
But now it was Christmas, and he was sullenly packing a bag for his trip home when there was a knock on his door. He jerked it open to find Blaise smirking at him.
"Looney is in the hallway, she wants to see you."
Draco was at the staircase before Blaise had even finished.
In the hallway, Luna was standing near the door, seeming to count something on her fingers. She was wearing a light blue dress over thick grey tights, with a warm cardigan pulled over that.
She looked up when she saw him, and smiled. He smiled back, not caring that they were in front of the Slytherin common room and there were undoubtedly countless eyes watching them. She gestured for him to follow her, and he did, like a lovesick puppy.
She led him away, down the long dungeon hallway, up a narrow staircase he had never used before, which led to a small alcove with several doors.
She went and opened the first, and pulled him inside. The room was small, octagonal in shape, and devoid of furniture aside from a low velvet bench in front of the surprisingly large window.
"Where are we?" he asked softly, not wanting to ruin the moment. The moonlight from the window spun through her hair magically. She had removed her sweater while he was studying the room, leaving her thin shoulders and porcelain skin exposed and glowing.
She smiled, a secret smile. "These are empty offices, to use if we ever get any more professors. But we've always had the same number, so they've been forgotten."
She stepped forward, and wound her arms around his neck, stretching up to meet his lips softly before dropping back to the flats of her feet.
"It occurred to me," she said softly, "That I was left wanting that night by the lake."
"You were left wanting?" he asked incredulously.
She laughed lightly. "Okay, maybe we were both left wanting." She kissed him again.
"And now it's time for the holiday, and I won't see you for weeks," she said. "So I was planning on taking advantage of you now, so that I'll have something to remember you by."
He laughed then, just for a moment, but she thought that it was the prettiest thing she had ever seen—a smile crossing his face unabashedly, instead of the usual scowl. He probably didn't even know he was doing it anymore.
"I like it when you smile," she said wickedly, walking him backwards until the backs of his knees hit the wide bench. She pressed him down onto the bench, small hands still holding his shoulders. Then she straddled him, knees on either side of his hips, and tangled her fingers in his hair. With a low groan, he leaned forward and caught her mouth with his.