Penny Birch 
Saddled up [EPUB ebook] 
An Amber Oakley Adventure

Amber Oakley is back! Determined as ever to avoid getting her bottom smacked but her own deep needs and the awkward circumstances she finds herself in trying to solve her financial difficulties mean otherwise.
Offering riding tuition to girls from wealthy families seems like a good idea, but Portia and Ophelia Crowthorne-Jones prove to have a few ideas of their own, and are soon indulging both their lesbian desires and their cruel sense of humour at Amber”s expense. Will she end up as their plaything, or can she turn the tables and teach the little brats the lesson they so clearly deserve?