Books in the Billionaires of Manhattan series

I'm the most feared man on Wall Street...unfortunately, my best friend's little sister hasn't gotten the memo. I brandish equations like lightning bolts and shatter fortunes with mere scribbles on a whiteboard. People up and down Wall Street steer clear of me-or come to regret it. My walls are impenetrable as Alcatraz, and my self-control? Rock solid, my friend. Except when it comes to her. The woman I've secretly longed for. The only woman I can never have. My best friend's little sister, Stella. Growing up, she saw me as a heartless robot. It couldn't be further from the truth, but a promise I made to her brother binds me, and my code of honor is as rigid as my isosceles triangle. I hadn't laid eyes on her for years, but now she's in the heart of Manhattan, and I've unintentionally sent her career into a nosedive. My solution? Offer her a job at my hedge fund. Suddenly I'm the boss of her, faced daily with her sparkling eyes and gummy worm obsession-and her infuriating refusal to stay away from me. Well, I buried my feelings for her once before. I'll do it again-to the nth degree.