Stealth by Reese Knightley

Hunter –
Seven is hot as hell, possessive, and dangerous—his perfect match. Except Seven is not into long-term commitments. So, when the man is still in his bed one morning, Hunter thought they’d have a couple of perfect days together. Hunter wants to share about his past. Then again, maybe he shouldn’t say a word since his secrets could get both of them killed.
When Hunter’s past rears its ugly head, he is out of time.

Seven –
Hunter is sexy, lethal, and irresistible. Seven can’t decide which trait is more appealing. There’s something else, though—something dangerous simmers beneath Hunter’s surface that intrigued him and has brought him back for more. Seven can’t stay… he won’t commit until he finds his sister’s killer. He needs to take care of that before he can make promises. Best-laid plans don’t always work out and staking his claim can’t wait when assassins come gunning for Hunter. Seven will need to pull out every trick from his arsenal to stop them.
Because nobody is going to take Hunter from him.