Kiss of Steel by Cara Bristol

Can she find refuge in the arms of a killer cyborg?

Bio-engineered to be an assassin, cyborg Jason Steel is targeted for destruction after he runs afoul of his creators. He escapes, and, passing himself off as human, seeks asylum on planet Refuge. Since couples are given priority, he applies for a wife through the Cosmic Mates interplanetary matchmaking program.
He loathes shackling himself to a wife just as he can taste freedom, so he intends to jettison the ball and chain as soon as he fulfills the contract requirements.
Honoria Foster is on the run from a hit man. After overhearing her boss plotting a murder, she testifies against him in court. But he’s acquitted, and now she’s in the crosshairs. In desperation, she submits an application to Cosmic Mates as a way to get off Earth. To her immense relief, she gets a match.
Her new husband isn’t the alien she expected, but a human—a cold, rude, rather scary man. But she finds solace in the fact that she’ll be safe at Haven Ranch on planet Refuge.
Mutual dislike puts their marriage on a rocky footing, but, as they’re forced to cooperate with one another to adapt to a new life on a strange planet, friendship and mutual respect begin to grow, and amity soon blooms into attraction, passion, and love.
But Steel’s secret past remains a threat to their sanctuary and their marriage. Will Honoria still love him when she finds out the man she married is a cold-blooded killing machine?