Protective Instincts (The Precinct: Brotherhood of the Badge #1)
Julie Miller

Kansas City had no better guardian than Sawyer Kincaid. The decorated police officer had a family legacy to uphold and a reputation that none could rival. Until one distress call ignited the most personal case of his career....
He'd saved Melissa Teague's life once - long before she had a son. The boy would be safe with Sawyer, but she wasn't so sure how she could bear his presence again, not when their feelings endangered them both. A man that powerful - however gentle - scared her, no matter how right Sawyer fit. But this time her protector would not walk away, not with his family's lives on the line. This was his sworn duty.