The reaction by parents of school children in this public Facebook Group (based in Virginia, USA) had me dumbfounded! I came across the book via a link on Facebook to this post.
www.facebook.com/groups/1442444526082364/permalink/2384149015245239/
The OP is concerned about the book being in local libraries. Other parents respond by buying it for their kids and asking their local libraries to stock it or get more copies!
Others who are concerned about the content raised above are mocked, ( "Grow up!" etc.) or have chunks of the Old Testament quoted at them - "I found this awful book on every pew in a local church!" - followed by quotes of verses from the Old Testament that uncritically or enthusiastically endorse incest and paedophilia.
I am posting this here as an insight into the mind-set of parents who think it is a good idea that this book covers these issues in the way that it does.
I wondered what Jessica Eaton would make of it. She does not seem to have tweeted about it and there is, annoyingly, no Search function on her web site:
www.victimfocus.org.uk
. . . OK . . . so I made a Google Custom Search Engine for her web site 
Search Victim Focus
It does not find "magenta" anywhere though - drat!
(Bookmark that Custom Search Engine if you ever want to use it again. I will contact Jessica and ask her if she is OK with this - if not then I will delete the Custom Search Engine.)