It seems to be a thing with Amazon e-books in center ....genres....to describe that genre as completely as possible within the title. For example: Taken by the Alphas (Book Two): Gay Shapeshifter Wolf Ménage Romance, or Taken by the Shifters: Part One (BBW/Shifter Romance), or Taken: Billionaire Menage Romance Serial (Billionaire Brothers Book 1).
There seems to be a lot of taking going on, a lot of shapeshifting going on, a lot of being a BBW, and a lot of billionaire romance going on.
I'm waiting for the billionaire shapeshifter genre.