The Triton Experiment Series by P.J. Schnyder

As a mercenary, Kat Darah doesn't have to pass for a normal human. On the edge of the solar system, she's just another biped. Most of the time. Nearing the end of his military tour, Lt. Christopher Rygard debates the idea of hanging up his uniform for good. Looking for answers at the bottom of a glass of scotch, he meets Kat. One shared night of mutual desire seems harmless... moreAs a mercenary, Kat Darah doesn't have to pass for a normal human. On the edge of the solar system, she's just another biped. Most of the time. Nearing the end of his military tour, Lt. Christopher Rygard debates the idea of hanging up his uniform for good. Looking for answers at the bottom of a glass of scotch, he meets Kat. One shared night of mutual desire seems harmless. But when their tryst is interrupted by attackers hunting Rygard, Kat must reveal her other form, the predator beneath the human façade. Together they embark on a dangerous mission—a race against time to meet the enemy's demands, while trying to deny the passion between them. Rygard is faced with a terrible choice in the face of duty: Report the existence of a human turned shape-shifter. Or forget he ever met her. 25,000 words less

Book two of The Triton Experiment Intergalactic mercenary Kat Darah has been ordered to keep her shape-shifting ability a secret from everyone but those closest to her, for her own safety. She’s learned how to control the feral rage… for the most part. But when Lieutenant Rygard’s military unit goes missing, she’ll use every skill she has to find her man. Lt. Christopher Rygard has witnessed his girl shift, and he still wants her... moreBook two of The Triton Experiment Intergalactic mercenary Kat Darah has been ordered to keep her shape-shifting ability a secret from everyone but those closest to her, for her own safety. She’s learned how to control the feral rage… for the most part. But when Lieutenant Rygard’s military unit goes missing, she’ll use every skill she has to find her man. Lt. Christopher Rygard has witnessed his girl shift, and he still wants her. After Kat rescues him from alien clutches, he’d like nothing more than to wrap her in his arms again, but his first duty is to his men. And half of them have been shipped off-planet to be sold as slaves. Kat and Rygard will need to form a new team to go deep undercover, posing as gladiators and learning to fight together—not just side by side—in order to survive. In the arena, it’s all about who is the strongest predator… 82,000 words less