Thats not BDSM. 
 No. 
 That's abuse, rape, torture and everything that you don't want to happen to a 13 years old. 
 Cavan's former 'master's' a rapist, pedophile and a monster of the worst kind. 
 And after all this years of torture the first thing that do his 'new master'...the same thing. 
 Clearly people who had enjoy this book do not know the basic of human right and know nothing about this lifestyle. I felt a lot of disgust after reading that thing.