Shifting Heat - Protect and Serve, #10

Special Agent Rob Hunter lives to protect. After all, it's what unicorn shifters have done since God created virgins. When his best friend asks him to help his little sister recuperate after she's injured, Rob doesn't hesitate. He has fond memories of the sweet little tomboy who chased after them when they were kids. But half-phoenix Kenna Monroe has grown up into a sexy, smart-mouthed vixen with a chip on her shoulder when it comes to relationships.
As an ex-cop who now leads a crack team of commandos into pockets of paranormal resistance, she needs a champion even less than she needs her childhood crush reawakening all her old feelings. So what's a traditional unicorn to do when the woman he's falling for isn't a virgin, doesn't need protection and is hotter in bed than any sane man can resist?