Assassin's Kiss — Paris Brandon

Book 1 in the Jaguar Assassins series. Kira, a two-natured jaguar shifter in heat, desperate for sex with her own kind, is moments from death at the hands of a band of rogue shifters when another jaguar rescues her. Sebastian, a lone Jaguar Council Assassin, knows he's in trouble when he chooses to neglect his duty to kill the rogues he's been following and instead rescues the female whose scent intoxicates him. He can't resist the first touch of her naked flesh or her heated demands for the sex they both want. But Kira is the forbidden halfling of prophecy, the key to a secret that the Jaguar Council will kill to keep and their ancient enemy, the Brotherhood, will kill to possess. Tortured by a desire that neither can deny, even sex with Sebastian becomes dangerous for Kira, they fight their way through a growing list of enemies for the chance to be together.