Penny Birch 
American Blue [EPUB ebook] 

When Penny Birch discovers that her niece Jemima has been seduced into making a working tour of some of the USA”s most notorious pornographers, she feels she has no choice but to save her from the clutches of these dangerous men. But Jemima is not to be dissuaded, and as aunt and niece travel west from New York they get themselves into all kinds of kinky trouble.
American Blue takes a light-hearted but unashamedly perverse look at the American porno industry from the perspective of an innocent young model.