The Billionaire's Nanny (Billionaire Next Door Book 1)

Details: Unbeknownst to me, when I became a billionaire, my cousin made me guardian of her son in the event something happened to her. I only found out about her decision a week before the kid showed up on my doorstep with a gorgeous woman who thought she'd be a better choice for his guardian. We worked out a deal. She'll be the nanny. I won't fall in love.