This is going great.
I have seen people ask for pregnancy but i am not sure how you would make it into a thing. I suggest going with the easy ones like the rabbit and wolf. Easily just copy them and make smaller versions of the two to be babies. Also making a baby room would be great which should cost materials.
Something fun is missing in my opinion and that is a threesome, foursome and orgy. These will be tough to do but i think the challenge would be like fighting a boss. Trying to handle more then one girl in a sex mini game. A good start with the threesome is having the rabbit and wolf at the same time.
One more thing as well. You should make a item that increase the character penis size. It is a item that turns others into a virgin, make their butt bigger and make their breast bigger.