Not So Innocent (Shattered Glass #2)
Dani Alexander

Intellectually and artistically gifted, yet emotionally immature, Nikolaj ‘Cai’ Strakosha engenders protective feelings in nearly everyone he meets—much to his frustration. At sixteen, his attempt to rebel results in a series of heartbreaking events that brings Agent Riley Cordova into his life, and into his heart. But Riley treats him as gingerly as everyone else. Two years later, Cai rebels again. This time the stakes are even higher, the danger more significant, and Cai knows exactly what he’s getting himself into.
When Cai returns after a year abroad, he has a hit man and secrets riding hard on his trail. If Riley thought avoiding romance with the boy was difficult, the man Cai has grown into is a force stronger than a hurricane.