A/N: I don't like this one much...ah well.
Prompt #2: 7/10/17
355 words, according to Google docs.
Mad was one word he could absolutely, without a doubt, use to define Weasley. Barking mad, she was. He watched her as she skipped into the Great Hall, slightly late to breakfast that morning. She was attentively listening to Potter as they took their seats at the Gryffindor table - laughing and playfully socking him on the arm. He just happen to run into her later, arm in arm with that Loony what's-her-name, hiding from something that sounded like a wronkle sprout. Not that he'd been listening to their conversation.
Of course, he just had to encounter the strange enigma that was Ginerva Weasley (yes, contrary to popular belief, he did know her name) during 7th year charms as well. Why did she have to be so bloody smart? he wondered, idly twirling his quill in between his fingers. She was in too many of his classes for him to feel comfortable - potions, transfiguration, and herbology to boot. He sighed. He would probably run into her later anyway.
Her madness is spreading, he mused that night at the library. His conveniently chosen spot allowed him a clear view of the Weasley girl and another girl, whom he didn't pay attention to. He frowned. What Gryffindor laughs while doing potions homework? Especially an essay? Because Weasley was definitely laughing. She had a strange, slightly captivating way of doing so - throwing her head back and erupting into a peal of giggles that subsided gradually - it was positively maddening. See? More mad.
He'd sometimes see her up on the Astronomy tower, lying on her back and staring at the stars. In his place, no less. The first time he did, he wanted to step out of the shadows, to chase her out of his hiding spot. But she was smiling, in her strange, maddening way, and he couldn't. So he watched her till dawn.
He had carefully gathered all the evidence - her strange walks around the lake at dusk, her reckless flying instincts, her tinkling laugh…
He could not get her out of his head, and soon came to the unfortunate but inevitable conclusion that he was mad, too.