Thanks for pointing out that bug! It looks like there was a typo in Shiori's jealousy code, so it never actually could set Nanami as the person she found out about. (And since Nanami has a higher chance of triggering the conversation, I missed that during testing.) It should be fixed in the next version!
As for when v9 will be ready, I'm afraid there's not really a solid timeline yet. So far I've only written one of the afterstories and outlined two others. I'm hoping to be able to finish them before the year is over, but I don't have any specific date set at the moment. Hopefully they can live up to your expectations!
(As a side note that may hype them up a bit, the afterstories will be a bit longer than normal scenes from the game. Many scenes are between 200 and 500 words in the main game, but the afterstory that has been drafted is ~1200 words. So hopefully these stories can give an additional sense of closure, beyond the ending of the main game.)
At any rate, thanks for the comment/bug report! I'll keep your interest in the afterstories in mind and hopefully get around to those soon.