This is just one of the hidden disorders that each of the girls suffers, it is a degree of Stockholm syndrome. Where they actually began to feel as if John loved them, and this was his way of showing it. I mentioned multiple times that there were conditions and issues that weren't as obvious as Sheila's, or Ashley's.
You are seeing that first hand with this current level of discussion. John had each of the girls willing to offer themselves to John in an attempt to protect the youngest (Ashley) from John's behavior. You will learn in the coming chapters why the girls never actually went to the police or judicial system, instead took matters into their own hands per se.
As a continued tidbit... EVERYONE that you have encountered thus far is dealing with some sort of Psychological or Sociological disorder. And not all of them are readily and easily definable. But each are just as serious as the others.
You will learn more in the coming updates, and yes
laeg15 you will be able to interact with them more in the next chapter. In fact, there are two particular scenes you may enjoy.
As far as the choices go as the story progresses. They will be very self explanatory, there are no "hidden" consequences moving forward. Everyone is just as important to the healing process of the others as they are to their own.
Has anyone spotted Becca's disorder yet? Or Katelynn's?