A Billion Reasons Why by Cynthia Dane

A wayward billionaire looking for love. An activist who also happens to write the most scorching dark romance novels to ever hit the bookshelves. Every time they think they’re clicking, they’re reminded of the differences that shackle them to the same old lives.
That’s what happens when Phoebe Dahl walks into the office of Preston Bradley, the man who owns her publisher. What’s a mere formality for her turns into the best day of Preston’s life.
Because he’s found the one.

Phoebe’s distrust of capitalism and drive to help those less fortunate than her puts her at instant odds with the man who lives by himself in a huge mansion in Portland’s affluent hills.
Yet he wants her. He’s pretty sure she wants him too. Otherwise, how is she ending up in his bed?
But there’s one thing Preston doesn’t know about Phoebe. He’s not her first ride at the billionaire boyfriend rodeo… and the last rich boyfriend nearly destroyed her ability to love.
While Phoebe plugs away at her next bestseller, Preston comes up with a plan to prove to her – and the world – that they are destined to be together.

Even if there are a billion reasons telling them to give it up.