Ignoring the child aspect for a moment, it's interesting how some crimes are considered no big deal in video games and yet others are left for the most extreme fringe video games. Take sexual assault. How many players/publishers/review sites would be okay with a main character being able to sexually assault their companions? Or random npcs? I know I wouldn't be comfortable with it, and yet I don't really think twice about killing a bandit, or Astarion, simply because he annoyed me and pulled a knife on me a single time.
If an integral part of gameplay were to be sexually assaulting people to progress the story, would you feel different?
It's a bit of a crazy question. It's hard to imagine it as something productive, necessary, or done for any other reason than humiliation. You'd have to make a game about some succubus, which in turn will just make it pornography. Targeted at people with related kinks.
Quite different than a scene in Bg3 where, to extract information, you maybe assault someone's spouse in front of them. Even so, that's not the same as randomly assaulting your companions. The psychological commitment is graphic in either case. It's not gamified. It's not pornography. You can take away all the icky aspects of murder: the blood, the smell, the guilt and the consequences. You can't take away the knowledge of having tried to sexually dominate, it's the intent that's as repulsive as the act. It doesn't fade away like video game crimes that are thoughtless.