Rookie by Leanne Tyler

Senator’s daughter Margot Wills sees the Brotherhood Protectors as hunky sidekicks and wants one of her own. But when her life is threatened and she really needs a bodyguard, she isn’t aware Eli “Rookie” Rosi has been tapped for the job.
Eli, medically retired due to hearing loss from a mission gone wrong, sees Margot as a rich, spoiled girl who has more time on her hands than productive works. Can these opposites attract? And when it really counts, will Eli be able to keep her alive?