Pretend

Alessia Valentín
She's an intelligence officer on orders to go overseas on her first deployment. Despite who her parents are, she's determined to prove she belongs there. After getting informed by her step-father, Admiral Ravenmore, that she's a target for multiple enemies, he assigns Operator Creature as her personal security to watch over her while she's on deployment. Ever since they collided, she's been under the mysterious, tall, scarred, and masked Daegan Hannibal's spell.
Daegan Hannibal
Everyone calls him Operator Creature, a nickname he earned after surviving situations he shouldn't have. He's a Navy SEAL who is the most lethal sniper in the entire military. He never misses. After enduring tragedy after tragedy, he doesn't believe in love. He's as cold as his ice-grey eyes. After avoiding his demise once, he runs into a different kind of one—his boss's daughter.
Pretend can be enjoyed as a standalone. It does end on a cliffhanger. It is highly encouraged to start with the first book in the series.