Loving it so far, i would like if you can get different voices for each girl. best would be a unique voice or moans for every girl, maybe you can try with AI to develop moans? Its easy to do once you get understand how to do it and use the appropriate AI or you can hire a girl to make a lot of recordings... Or you can simple record some porn, get the audio in some parts and use those... Not like anyone is going to notice hehe. (if they do... holy F, xD)
I understand what you mean, but at the moment there are only moans, voice acting isn't something that would make sense yet, if not for the fact that dialogue is still getting changed and tweaked throughout the whole story actively.
Regarding AI, I'm not sure it's good enough to be as consistent as needed.