Kelly Hunter 
Playboy Boss, Live-In Mistress [EPUB ebook] 

Getting very personal with her boss! Playboy billionaire Alexander Wentworth is the man who has it all — and regularly acquires more! More wealth, more power and more women… His personal assistant Sienna Raleigh, however, is determined to keep things strictly business — no matter how tempted she is!But when they are forced to work and live together, Sienna soon discovers that Lex is just as demanding away from the office. He wants her to be his mistress — and he isn’t a man to take no for an answer!