With word the game will be going 3D, I'm with the others for the worry of losing the charm of the more simple get expressive 2d art style
But I also completely understand that this is the route to go if we want animations.
So with that in mind, I'd recommend using models that aren't too realistic. A lot of erotic games people tend to find unappealing because a lot of them use the rather ugly doll like human models.
I think more simplistic rigs and cartoony ones would be better suited and help keeping the games look more unique
And still giving ease for animations.
There was actually a video I saw just a couple days ago going over simplistic polygonal models for the sake of unique looking styles (It was about the models found in Megaman legends if anyone would like to check it out) and I think thats what I would keep in mind for a game like this.
Really enjoyed the update overall, looking forward to seeing more as always. Its actually really cool how good you are with keeping up with all the feedback and player input
And the turnover time for these updates is really impressive too.

