Good work overall. KLK is really great choice for porn parody, it isn't even feel that out of place due to already existing lewd things. New characters doesn't feel off aswell, exploring more club activities with them is nice idea. Writing is okay, didn't wanted to skip dialogues, tho "battle" descriptions are either too long or bland, which is ruining dynamic.
The only real problem I see are main characters. Even if it's intended, Ryuko is WAY to timid compared to original self. And Satsuki got too little screentime. I got that she is last boss, but so it was in the show, yet she was very prominent in the story even before betraying her mother. Hope more Satsuki is planned for future updates (is it? or she will only appear in the "rumors" and the very end?). And in that little scene with Rei we got so far... I think she is enjoying herself more than she shoud be, start of the scene is great, she is true to herself, emotionless and isn't showing any signs of lust, but shortly after there is grinning and such, which is out of character to me (save that grins for special ocassions!). ...well atleast she doesn't get "correction" after couple pages like in 90% hentai, thanks for that.
Btw some occasional m/f scenes won't hurt yuri focus I think. Maybe ffm, where one girl dominates another using male as tool (those noname 1 star servant guys). Or just Satsuki with the rest of elite four.