So here's another entry.

tenacious: 579 words

Tenacious. At least that was one word for describing James Potter. If it were up to Lily, she had a few other choice words up her sleeve, but she restrained herself. It wasn't in her nature to use that kind of language, no matter how much she wanted to.
She had driven him away for the twentieth time that day, stating that no matter how many times he asked her, the answer was not going to change any time soon.

"What's up fireball?" James whispered in her ear, causing her to jump a little bit from the bench she was sitting on. "Your red hair is blazing against the sky. I could see you from a mile away."

"James," she countered, "the way you flirt is shameful."

"Shameful, you say? Why, I think it's rather useful. It got your attention now, didn't it?" He grinned deviously. Staring at him now, Lily had a perfect view of his dazzling hazel eyes. She couldn't look away. It frustrated her. He was much too self absorbed for her liking and yet she still sat there.

"I know what you're going to ask," she spat as she shook her head to look away, "and the answer is no. You might as well go away."

"But Lily, dearest, I really don't think that's the truth. You see, I have a theory. And that is, if I ask you enough, you will eventually give in, because you want me off your back. Now, if I were to ask you one last time, what would your answer be?"

Lily stared blankly, stoic for a moment. She was surprised that the airhead that is James Potter had come up with something possibly accurate. Especially considering he paid no attention to anyone else besides his immediate group of friends and, of course, himself. But it was true. He stood there, waiting for an answer, patiently almost.

"James," she said, preparing her side of the bargain, "if I agree to go on a date with you- and I'm not saying I will- would you leave me alone afterwards?"
James eagerly nodded his head, throwing his right hand over his heart.

"I solemnly swear that if you do not enjoy the date, then I will forevermore leave you alone and never ask you out again."

Lily sighed, but told herself that it was what she wanted. And who knows, maybe the date wouldn't be half as bad as she was thinking it was going to be. In the end, she decided, that going on a date with James would be worth it. She could finally sort out the mixed emotions she was feeling when she was around him, like her odd desire to run her hands through James' shaggy brown hair and at the same time the desire to hit him across the face for his shallowness.

"So..." Lily muttered, "Would you want to meet in the common room?" James looked like he was about to double over.

"Are you serious?" he asked, his cool guy demeanour slipping away, and Lily had to admit, it was kind of cute.

"Do you think I'm joking?" she replied.

"N-no, but I just- I never thought- never thought you'd say yes." She couldn't help but smile. Still fazed, he continued. "I'll meet you in the common room at 1 PM on Saturday," he said, winking. Lily rolled her eyes. There it was again. Shallow James. But it intrigued her.

"It's a date."