How to guide for a sex slave

This is volume 1, a taster. Amy has been taken but she is proving difficult to train; Robert is resented by his brother and his father has blackmailed him into preparing Amy for her owner. It is well-written and interesting, but too short. The reader gets a feel for the characters, and can guess at how the story will unfold, but the cliffhanger ending leaves you more frustrated than the protagonists are. ( )