Because people say “Akamatsu does moe”, at the beginning of Negima! I used the power of moe, but moe is consumerable goods. Go to Comike on Day 3, and you’ll find a lot of ero-parodies for a popular anime, but it’ll move to another anime the next year. Guys can only love the same girl for one year, you know. It’s zoological. Girls can keep making Slam Dunk parodies over and over, for a long time. They can love just one. You’ll know that moe is consumerable goods when you see that. I mean, even I start liking a heroine when I watch a new anime.
From this interview with Akamatsu.
(On another note, I’ve heard a few mentions of “Nodoka’s been slapped by Paru (as a gag) before, so she’s okay!” but those really were gags, Haruna only pretended to slap her and actually flicked her on the forehead. Akamatsu commented that he had to make this clearer the second time by adding an arrow pointing out which hand Haruna actually hit Nodoka with, to prevent these kinds of misinterpretations.)
Anyway, here is the full script of 317.
EDIT: Gaaah, missed a line on pg1.
EDIT2: Fixed typo on pg10. (minor, but I really need to pay more attention -_-)