I can't help with your first problem, but i can comment on the second from a outsider to the furry fandom.
I think the concept you're attempting to do is fine and in fact has been done before in comic form by Kadath. So you can start there for insipiration if you want. It would be interesting to see how you handle it in VN form and how it plays into any romance or dominance aspect you choose to incorporate. I guess that brings me to critiquing the art, so here's my take it looks good now but i don't know how well that's going to translate to a game and animation. For me the models are fine but almost too clean if that makes sense.