Alien Male Mate Series by Alana Heagney

I bought a monster to save my sister. I didn't expect him to save my soul. Leo Graves has 72 hours to find his kidnapped sister on Station 9 before she’s shipped off-world forever. He can’t do it alone. He needs a weapon. He buys Vrax. A Nyxian combat-slave with obsidian skin and eyes like moonlight, Vrax is the most terrifying thing in the Flesh Bazaar. He’s a killer, a weapon used by the syndicates to break their enemies. But when Leo unlocks his chains, he finds something else entirely... moreI bought a monster to save my sister. I didn't expect him to save my soul. Leo Graves has 72 hours to find his kidnapped sister on Station 9 before she’s shipped off-world forever. He can’t do it alone. He needs a weapon. He buys Vrax. A Nyxian combat-slave with obsidian skin and eyes like moonlight, Vrax is the most terrifying thing in the Flesh Bazaar. He’s a killer, a weapon used by the syndicates to break their enemies. But when Leo unlocks his chains, he finds something else entirely. Beneath the scars and the silence is a being starved for a gentle touch. As they hunt through the neon-lit slums of the Rust-Belt, the deal shifts. Vrax stops acting like a hired gun and starts acting like a mate. He’s possessive. He’s hungry. And he looks at Leo like he’s the only star in the sky. But the Syndicate is watching, and the rescue mission is a suicide run. To save his family, Leo will have to unleash the beast. .. and pray the man he’s fallen for survives the slaughter. less

Two captives. Three warlords. One impossible bond. SILAS I was bred to be a toy. Beautiful, silent, and obedient. When my master sold me to the flesh merchants, I accepted my fate. I didn’t expect to be thrown into a cage with a feral, angry thief who looked at me like I was broken glass. And I certainly didn’t expect him to stand in front of me when the monsters came. KNO X I’ve spent my life stealing to survive. I don’t do "partners," and I definitely don't do "submission... moreTwo captives. Three warlords. One impossible bond. SILAS I was bred to be a toy. Beautiful, silent, and obedient. When my master sold me to the flesh merchants, I accepted my fate. I didn’t expect to be thrown into a cage with a feral, angry thief who looked at me like I was broken glass. And I certainly didn’t expect him to stand in front of me when the monsters came. KNO X I’ve spent my life stealing to survive. I don’t do "partners," and I definitely don't do "submission. " But when our transport was raided by the Void Legion, I couldn't just watch the pretty, trembling aristocrat get torn apart. I stepped in. That was my mistake. THE TRIAD Zarkon commands with a voice that vibrates in my bones. Vex stalks us from the shadows, his tail twitching with a hunger I can smell. Irix watches us with glowing eyes that see every secret desire we try to hide. They are the nightmares of the galaxy, and they have decided that we belong to them. Not just one of us. Both of us. They say we complete their circuit. They say they will burn the galaxy to keep us. Silas is ready to kneel. I’m ready to fight. But in the dark of the Void, with three alien warlords demanding our bodies and our souls. .. Fighting might be the most dangerous form of foreplay. less

Subject. Prisoner. Mate. I didn't plan on crashing my ship on Xylos-4. Nobody plans on landing on a planet classified as a "biological incinerator. " But when you owe the kind of credits I do, you take risks. I survived the crash. I might not survive him. Dr. Kael’vax. He’s seven feet of obsidian scales, claws, and cold, terrifying intellect. He’s the only other living thing on this rock, and he didn't save me out of kindness. He saved me because he needs a lab rat... moreSubject. Prisoner. Mate. I didn't plan on crashing my ship on Xylos-4. Nobody plans on landing on a planet classified as a "biological incinerator. " But when you owe the kind of credits I do, you take risks. I survived the crash. I might not survive him. Dr. Kael’vax. He’s seven feet of obsidian scales, claws, and cold, terrifying intellect. He’s the only other living thing on this rock, and he didn't save me out of kindness. He saved me because he needs a lab rat. I’m infected with the planet’s spores, and Kael’vax is the only one with the cure. But his "treatment" involves more than just needles and scanners. His species is cold-blooded, but the heat radiating off him when he looks at me is enough to burn. As the toxicity in my blood rises, so does the madness in his eyes. He says he’s studying me. He says I’m just a variable in his equation. But I know what that look means. He doesn't just want to cure me. He wants to keep me. less