What Does Belinda Blumenthal Describe as Supple in the Night-receptionist Chapter?

The young receptionist at The Horse and Jockey helps pull off Belinda's riding boots. She has lost count of how many times she has pulled those boots on and off in the past ten hours, and she thinks they are getting more supple each time. She then muses, "perhaps like her own body." Jamie, James, and Alice take that as Rocky comparing her body to the leather, more stretched after the day's encounters. The explicit line in the book is about the boots. The aside about her body is what the hosts jump on. She then tells him to ravish her.