30 Days of Kink, Day 21

Day 21: Favorite BDSM related book (fiction or non-fiction)

As I've only read 2, and they are two halves of a story, I guess they would be my favorite.

The Story of M and Beauty and Submission by Maria Isabel Pita

It's a story about the first few years of Maria's life as a slave to her husband.

I haven't read them in a few years, to be honest, but they really intrigued me when I read them.