The Limit War Series by Nico Rosso

Welcome to the Limit War. E.R. Doctor Korina Antonakis thinks she has mastered the chaos of her work and life. In a flash of light, everything changes. A man appears, a soldier from another world. Sergeant Morrow is a Nightfighter, an elite soldier who always battles alone. But he needs an ally on Earth, a doctor. In the dark of night, he opens Korina's eyes to The Limit War. And Earth is on the front lines. More amazing than the interstellar war, is the soldier before her... moreWelcome to the Limit War. E.R. Doctor Korina Antonakis thinks she has mastered the chaos of her work and life. In a flash of light, everything changes. A man appears, a soldier from another world. Sergeant Morrow is a Nightfighter, an elite soldier who always battles alone. But he needs an ally on Earth, a doctor. In the dark of night, he opens Korina's eyes to The Limit War. And Earth is on the front lines. More amazing than the interstellar war, is the soldier before her. He is strong and stoic, a veteran, but beneath the armor, Korina finds the heart of a man. And in Korina, Sergeant Morrow finds the soul of a warrior to match his own. Their lives had started light-years apart, but the attraction between them pulls like destiny. Their desire is real, but the enemy needs to be driven from Earth. Can Korina and Sergeant Morrow's passion survive in the Limit War? less

Teryn Pilander lives in a world of secrets. She is a Shadow Corps operative for the Core Army in the Limit War, trained in espionage. Her latest mission takes her to the planet Viela, drawn by a communication that the local government captured a Dusk Warrior Officer for questioning. More interesting than the message, though, is the voice delivering it. A little shy, but deep and strong, the masculine voice sparks dormant fires in Teryn... moreTeryn Pilander lives in a world of secrets. She is a Shadow Corps operative for the Core Army in the Limit War, trained in espionage. Her latest mission takes her to the planet Viela, drawn by a communication that the local government captured a Dusk Warrior Officer for questioning. More interesting than the message, though, is the voice delivering it. A little shy, but deep and strong, the masculine voice sparks dormant fires in Teryn. She tells herself that once the mission is over, she might put her spy self away for a bit and live a little as a woman. Drel Kol has secrets of his own. He is the one who sent the message drawing Teryn and her team to his planet. But he was just following orders and led her into a trap. Now, the woman he spoke with could be in grave danger. Her voice alone is enough to ignite a passion he has never known. Yet he's only a technician. Can he fight against his own government and the Dusk to save her? And will the new bond between Teryn and Drel be torn apart when she learns his secret? less

Captain Jessa Tok is a veteran soldier, but when an artillery strike separates her from the squad she commands, it may be the end of her career and her life. Then a single Dawn Soldier fights his way behind enemy lines to find her. The last man she’d expect. The one soldier she’d had a fling with and was trying to forget. Sergeant Ryder Hiltop never thought of himself as a hero. He’s a career soldier, just trying not to get killed... moreCaptain Jessa Tok is a veteran soldier, but when an artillery strike separates her from the squad she commands, it may be the end of her career and her life. Then a single Dawn Soldier fights his way behind enemy lines to find her. The last man she’d expect. The one soldier she’d had a fling with and was trying to forget. Sergeant Ryder Hiltop never thought of himself as a hero. He’s a career soldier, just trying not to get killed. But when his captain is lost during an attack, he has to go find her. And not just for the sake of the other Dawn Soldiers. A shore leave with Jessa left an indelible mark on him, and he’ll do anything to make sure she’s safe. But is it a suicide mission to find her? And if they manage to fight their way to safety, can their brief affair grow into something more? less