Will pregnancy content lean more toward fetish elements, or will it be portrayed as a natural, emotionally-driven story?
Nope. I am not exactly in element of adding things for fetish sake. Just cause for example you have incestious themes, I didn't add it there for sake of fetish, but cause it serves story and plot properly. Fuels what I need for it for characters.
If I add stuff like pregnancy, then it will be done properly or not at all. I am not against adding specific things, but if I do, that won't be while I work on chapters. Additions, not related to story? Random bonus stuff? Sure, I can do that no problem.
But ah... yeah. If ( which isn't an IF, it really is I WILL), but WHEN I add pregnancy into the whole game. It will be there properly. Natural, used for story telling and emotion. Not for fetish.
Hope that's satisfactory answer for you.