It's Simple
She was always there. Not once had she trained with any one else—only with him. He couldn't understand why.
Day after day, she would be there, at the training grounds, just as he had arranged. A smile on her face- the one she reserved just for him- her pouch full to the brim with weapons of every kind. "Ready?" her eyes would glint with anticipation before she launched herself off the ground, showering deadly amounts of weapons on him.
Not once had she uttered a word of complaint about his long, not to mention bizarre, training schedule.
He'd once found himself tossing in bed, unable to sleep. And when Hyuuga Neji could not find sleep, there was only one thing he could do—train. Hesitantly, he had knocked on her door, and was soon greeted by a pajama-clad, mildly surprised Tenten. However, before he could begin his explanation, she had surprised him with, "training?" and an even more surprising "sure, just give me a minute to get changed!"
Above all, she could read him like a book, understand him when no one else could. He wasn't sure whether to be glad or to be infuriated by it. But nevertheless, it puzzled him to no end.
An upraised hand had signaled the end of their training session. She slumped down by his feet as he pondered hard how he was going to phrase the question. Her chocolate orbs met his and she must have read the question in his eyes, for she smiled brightly- the smile that never failed to make his heart skip a beat. "It's simple," he found himself sitting down next to her, "I love you!"
And he kissed her.