Free Bird - Douglas Group: The Protectors, #1

Shoulders back. Back straight. Chin up. Act like a lady, look like a lady. Oh, and be at your father's beck and call. These are things that Kate Freemont, Code Name Sparrow, has grown up with and she's had enough. If the country thinks she's spoiled and ungrateful, she has a finger for them. She won't ruin their precious image of the President but she's no longer playing by the man's rules, and she's certainly not going to put on a face for the world when Agent Henderson tries to drag her back to the White House. Tanner "Chance" Henderson lives by one word: protect. It doesn't matter that he's not a fan of the President's politics, and it certainly doesn't matter that he finds the First Daughter to be a brat.
He has a job and that's to keep his detail safe-even when she wants nothing to do with having Secret Service. Kate makes his job difficult, in more ways than one. She has an attitude a mile wide that's only gotten worse as she's grown up. And grow up, she's done. She's no longer the fifteen year old he met the summer before President Freemont took office seven years ago. Now she's a beautiful woman who's even more headstrong than she was before. He may not ever give into the attraction, but he'll stop at nothing to keep her safe...
Even when he realizes he already failed.