Already acknowledged it!
I have played both demos thus far! Just did some quick playing around to see what you've done. I'll give my initial thoughts!
I'd say you have a pretty solid foundation going though! I am pleased to see it is proper yakyuken, with both players losing clothing. Each of the girls between both versions are also very distinct, and I can see how each is their own character, which is good!
A bit unusual the game ends once they're down to just their underwear, but I'll also admit, it's an interesting change of pace. Perhaps it ties into the story behind all this?
I'd say my only real complaint is down to the dialogue - it's good, don't get me wrong there! There just isn't as much variety as I'd hope.
Still, I am quite intrigued and want to keep a close eye on this! The amount of good yakyuken games out there is pretty small, the last really good one I'd say was BlushHand, and that one was years ago.