It's not really core to the game. There's even an sfw version available that removes all porn. If you wanna know more in detail what toning down rape means. It means that you can tell the voice actress complains, cries and screams more and longer than what the subtitles reflect on screen. The scenes themselves last the same. They aren't cut.
As for children. The tldr is that "Shota" is translated as "you" and "Onee-san as me". Proper loli scenes haven't been released yet (Akisa is a loli bodytype character and she has all of hers available). One actual loli scene is coming very VERY soon and it's not even half-implied. You can totally tell it's an elementary schooler. We'll see what they do with that.
If you wanna reroll see >>418847
It has all the info you need.
Also it's not like I want to shill the game. I just enjoy it for what it is. If you really don't wanna play and you just want to watch all the h-scenes you can go to sukebei and get them all. They are really good by themselves (when you get to know the characters they are even better). There's a full archive of them >>394253