Well, I'm guessing the insane amount of hours any little update takes from the dev! But in fact, it's a real quality game to play, and the above suggestions are also valid ones.
I would also make a couple more. Put a toilet in the bathroom (it's a visual enhancement, and could be use for "Zoe" using it and talking dirty to the husband, entering the realm of toilet slavery), and add ass worship as another fetish to explore.
Congratulations on your amazing work.