Finally, I've figured out why the models were looking very dated. There's a Unity option for lighting mode that made a world of difference in how the shaders are processed as visible in the above. Skin doesn't look all plastic-y anymore. I am quite pleased with that.
I spent a fair amount of the week tuning the texture maps to work with the new lighting mode. I'll have to redo the video at some point now.
I also spent a good amount of time on the interactions. Grabbing Nipples and spreading vagina (NSFW) work now. These are all playable in a preview build just released to the $5 patrons.
I had to remove the "height" and "size" scaling for the characters and replace it with just "size." The non-uniform scaling was causing serious issues with the interactions lining up. Many hours were spent trying to figure that out unfortunately. Fortunately, since I figured that out on the nipples, the vagina (or "Undercarriage" as you can perform the same interaction without a vagina) was fairly easy to get that lined up.
The character loading between scenes is put together now, which is also in playable in the $5 preview build just released.
Full-ish list of stuff is available on the Trello board.