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"Someone was hogging all the werewolf books and I wanted to know who."

"Why did you want to read them?"

"The same reason why you want to read them. I wanted to look up werewolf cures."

Harry scratched the back of his head, "Any bright ideas?"

"Only stupid ones that make people laugh," Julia sighed.

"You mean Hermione and Ginny. At least you have ideas," Harry looked at her keenly. "So what is it?"

Julia told him her idea of vaccines and making the werewolf curse forget the full moon existed so as to not trigger it to begin with. Harry considered it. He had thought about vaccines, too, but he couldn't think of how exactly it would work. A vaccine that made the curse forget the moon wasn't completely beyond the realm of possibility.

"You should tell this to Miss Jackie," he concluded.

"I'd rather someone tell me my idea is stupid than to be too nice to say so upfront," said Julia, frowning. "So you don't think it's stupid?"

"No," said Harry. "One thing I learned from making the Holographic map is, as long as you're not violating the laws of logic and you're not messing around with life and death, you can make magic do almost anything." He knew so; he had actually invented a couple of spells for the map, mashing up plausible sounding Latin to create an incantation for the spells he had in mind, because he was too lazy to look it up and see if they already existed. "Make a curse forget something—why not? Ask Miss Jackie if the idea has contradictions, and if it doesn't, go for it."

http://www.fanfiction.net/s/7578572/41/