So I've been toying around with Unity3D lately and found it is pretty simple to put together interactive growth in a game project.
I put together a quick demo and may continue with it, but wanted to share at the early stage in case it interests anyone else here.
It is very rough but you can use WASD and T and G to interact, along with left and right click (cameras), left ctrl, and a few others I haven't fully explored. The buttons and text are from a prebuilt asset and I haven't gotten them all working yet. The jump action in particular is busted. Use Escape or Alt-F4 to quit.
The work is nonprofit hobby just for fun and uses some free assets from the unity store. The model in particular doesn't allow "adult content" so I will probably have to switch her out later.
https://drive.google.com/file/d/0B8b...ew?usp=sharing