Private Bodyguard by Tyler Anne Snell

As a bodyguard, it was his duty to protect her—not fall for her all over again… 

Orion Security Group's mission is to protect those in serious danger. So when Oliver Quinn's latest assignment unexpectedly brings him back into Darling Smith's life, he knows it's going to be his most challenging case yet.

From the moment he comes face-to-face with the beauty from his past, Oliver can't deny their history is going to make for some tension-filled days — and frustrating nights. But keeping her safe, even though she denies she needs his help, has to come before exploring their lingering feelings. She may not have asked for his protection, but with the killer on her trail, she can't afford not to have it…