Bron: A Scifi Alien Warriors Romance - Cygnian 7, #5

His secret could destroy them both... Ever since aliens secretly colonized her small hometown of Harbor, Kansas, Olivia Hall knew that her life would be full of adventure. She never dreamed that adventure would include sharing a soulmate bond with a towering, glowering Cygnian warrior. She knows Bron feels their connection, but doesn't understand why he's fighting it. She's determined to break through the walls her huge, blue soulmate has erected around himself. Bron has always held himself apart from other Cygnians.
He is the only Cygnian cyborg. Few know his secret, and he is honor-bound to keep it that way, even as his mechanical systems begin to malfunction with no hope for repair. When he meets a human woman whose gentle nature and soft touch brings his biological systems to the forefront, he must decide whether to try to build a life with her or let his own be forfeit. When the pair make their way to the homeworld of the incredibly secretive aliens who saved Bron's life by turning him into a cyborg, they uncover more danger than they imagined.
The enemy behind Bron's cybernetic malfunctions isn't done with him yet. Can Bron and Olivia's love see them through the challenges of an icy ocean-planet, or are they destined to sink into darkness?