One thing I'll say from my own experience making an illustrated interactive (35 pics and 15 scenes for the player alone so far) is know what it'll have from the get go rather than trying to add features later (by god is adding or changing something a pain in the arse when you've got over 30 pics needing reworked to make it work). And if you find it easy to come up with a few solid scenes but can't make them fit together, consult friends with similar tastes. They'll either help you decide by telling you how they'd do it or what they like most if you have some idea's already but just can't decide between them, or if they're particularly good writers they may even help you write the game. I found that having a friend help by taking on the lions share of the writing has helped me focus more on art, especially when the scenes they write inspires my art with events that just need drawn.
Though you seem to have a much more solid idea of the scope of the game than I did at first. Also well done on adding a gender choice from the get go, I added it later, which involved redrawing about a dozen pics that were in the game already.
So yeah, you've made a great start to this game and I can't wait to see how this develops, I do love human prey games and hope there will be some willing scenes. I know you said scat is out, personally I'd like to see some post digestion gas, possibly as an option to be disabled, though if you don't wanna add that I certainly understand, I've experienced my share of strange requests outside my comfort zone
Also love overweight female preds, not enough of them around.