His Captive Pet By Measha Stone -

To keep her safe from the criminals seeking revenge, Blake places Aubree in "protective custody" at a secluded location. Frustrated by her recklessness and tendency to lie about her activities, Blake decides that the only way to ensure her safety is through absolute control. He demands her complete submission, treating her like a "pet" to break her defiant streak and force her to follow his rules for her own protection.

A "forced proximity" scenario where the hero keeps the heroine captive to protect her from external threats. His Captive Pet by Measha Stone

This book is the third entry in the series, though it can be read as a standalone. His Captive Pet (Owned and Protected #3) - Goodreads To keep her safe from the criminals seeking