Portia Da Costa 
The Accidental Mistress [EPUB ebook] 

Seduced by a billionaire…
After being mistaken for a high-class call girl when they first met, Lizzie now enjoys a fiery relationship with John, her gorgeous and incredibly rich older man. Devoted, romantic and devilishly kinky, John knows exactly how to satisfy her every need.
But John has a dark side – and a past he won’t talk about. He might welcome Lizzie in his bed – and out of it – but will she ever be anything more than a rich man’s mistress?