Insatiable by Daisy Buchanan

Stuck in a dead-end job, broken-hearted, broke and estranged from her best friend, Violet's life is nothing like she thought it would be. She wants more - better friends, better sex a better job - and she wants it now. So, when Lottie - who looks like the woman Violet wants to be when she grows up - offers Violet the chance to join her exciting start-up, she bites. Only it soon becomes clear that Lottie and her husband Simon are not only inviting Violet into their company, they are also inviting her into their lives.