Pregnancy is really complicated system. XD. With 3D it is pretty hard and I use koi too. Atm, I better learn how to use the engine, learning more about game design, try not to overscoping the project and try to complete the game first. Since usually new dev problem is, bad news surrounding the new dev due to lots of abandoned game and stuff or got too over ambitious.
Last time I tried to scrapped NTR route and I scrapped a lot of other characters like Katey and others from early version is the scope got too big. Since, I have another idea in mind for making another series tbh. Just better to complete this chapter 1 main story first and then I might want to make that game a bit and just introduction thing to leave a mark(So I can remember that I will get back to it).
Chapter 2 I already got an idea on how it will go and so on. Since, I really can't do a really long project tbh.