Saving Caeorleia Series by Alicia Nordwell, Cia_

In the distant future, humans wage war against the alien planet Caeorleia, with no tactic off-limits if it will help the humans get their hands on Caeorleia’s resources. Ask Ryker. He thought he volunteered for a simple experiment that would help his government in the war. He didn't realize sadistic doctors would turn him into the experiment—by injecting him with blood from a captured Caeorleian, Seral Iorflas... moreIn the distant future, humans wage war against the alien planet Caeorleia, with no tactic off-limits if it will help the humans get their hands on Caeorleia’s resources. Ask Ryker. He thought he volunteered for a simple experiment that would help his government in the war. He didn't realize sadistic doctors would turn him into the experiment—by injecting him with blood from a captured Caeorleian, Seral Iorflas. Nor did Ryker realize he’d be sent to sabotage a planet full of the very beings his world is battling, beings who kill humans on sight. But then, thanks to the experiment that irrevocably changed him, he isn’t exactly human any longer—and with each passing day, as his blood bond with Seral strengthens, he’s less and less sure as to whose side he's on. less

Dade, human-Caeorleian hybrid and ex-military grunt, doesn’t fit in—not with humans, not with aliens, not anywhere. He’s always on the outskirts, angry, and people aren’t sure they can trust him. When he encounters a compatible tziu named Yaseke, secrets, misunderstandings, and attacks nearly prevent the two from making a connection Dade sorely needs. Even after they unite, Dade and Yaseke face challenges that two newly joined males should never have to endure... moreDade, human-Caeorleian hybrid and ex-military grunt, doesn’t fit in—not with humans, not with aliens, not anywhere. He’s always on the outskirts, angry, and people aren’t sure they can trust him. When he encounters a compatible tziu named Yaseke, secrets, misunderstandings, and attacks nearly prevent the two from making a connection Dade sorely needs. Even after they unite, Dade and Yaseke face challenges that two newly joined males should never have to endure. From traitorous council members, to sadistic aliens who plan to sell them as slaves, to meeting a mysterious race of revered aliens called Collectors, Dade and Yaseke manage to stay together—and even rescue two youths related to Yaseke, who’ve lost their parents to the same betrayer. Someone from Dade’s past is at the root of everything he’s suffered. No way can he let them get away with what they’re planning, but Dade isn’t sure he can stop them on his own. If he doesn’t let go of his isolation and risk the pain letting others in will bring, he’ll never save Caeorleia in time. less

Saving Caeorleia: Book Three. Their journey will span the universe and back, but there’s no guarantee they’ll make it together. Though Nick and Fieo are drawn to each other, their relationship has never been easy. Their differences go beyond their races, but they’ve managed to work together to prevent the spread of corruption, growing closer along the way... moreSaving Caeorleia: Book Three. Their journey will span the universe and back, but there’s no guarantee they’ll make it together. Though Nick and Fieo are drawn to each other, their relationship has never been easy. Their differences go beyond their races, but they’ve managed to work together to prevent the spread of corruption, growing closer along the way. Nick still battles the effects of years of loneliness, fear, and pain but surprises everyone when he refuses to stay behind when Fieo is sent on a vital mission to find the Collectors. Fieo objects, but there’s no stopping Nick when he sets his mind to something. Over the course of their mission, it becomes clear Nick is more than anyone ever imagined, but the mystery of his past threatens to derail his future. The search for the truth will take Fieo and Nick far from Caeorleia, to worlds both familiar and completely alien, and put stress on their already tenuous relationship. It’s a journey that will either tear them apart or finally bring them together. less