Thanks, everyone.
So Motoko'd go and impress Tsuruko by not only developing the Zanmash? Ni-no-Tachi/ Evil-Cutting Palm, Second Strike into a sword technique, but also by teaching Keitaro it? Then again, I realized that I probably meant to use Zanmaken Ni-no-Tachi /Evil-Cutting Sword, Second Strike in the chapter. I apologize for that. I'll make the correction when I get back from work later.
EDIT :The cloth cutting slice technique and having Keitaro only be able to use it would probably have a time skip that'll allow for shenanigans. Should I do it? Also, I made the edit from the palm to sword.
With quite a few re-writes here and there, it can be done. I just need to be told where.
Now that I think about, I probably should have Motoko think, 'Wait. Why is ane-ue so focused on getting me to wear those panties? She wears Fundoshi!' for either a bit of comedy value and to reference a little bit of trivia from the Mugendai.
I kinda feel bad for having Kitsune being so useless, but what could she really do? Another regret is the others not having a scene to show they're not themselves and to draw out the mystery, but I can fix that, assuming I don't over do it. .
Like having Shinobu have a scene or two, where there is an obvious feel she's not herself. Maybe she's flirty with Keitaro, to the point where he'd really uncomfortable?
Dunno with Sarah and Su, though. At the moment, Su's seems like it'd be like the aforementioned scene with Shinobu, but calling him big brother. Maybe Keitaro would have a flashback to something with Kanako. I'd have to do it to not imply that Kanako is either possessed by something similar or was the one to send the possessed panties, no matter how amusing that would be.
I could also have a scene where Naru is practically throwing herself at both Keitaro and Motoko.
My biggest worry is that if I were to add those scenes, I'd be overdoing it. However, I also realize that I'm pessimistic about my writing and tend to play it safe, to the point where I suspect my stories suffer from it. So I'm glad I have you guys to give me that little nudge to know where to play it safe and when to take risks.
...Come to think of it, I'm not sure how the possessed panties came into the Hinata. There's only a small hint that Naru might have been the first one or at at least the one that got the other possessed. Mutsumi might've been the first one possessed, for all I know.