Royal Bastard: Royal Romance (Winston Isles Royals Book 3) by Nana Malone

The second I saw her, I knew she was trouble… the kind I like most.
Don’t cause an incident, they said. Don’t forget who you are. As if I could.
A newfound prince, sure, but I’m still a conman at heart. And I’m nowhere near ready to say goodbye to the good times. So when my brother, the king, asks me to look after a diplomat’s daughter, I can’t say no fast enough. That aspect of my new life holds no appeal.

That is, until I see her climbing out of a window with her dress tucked into her thong. She might just be my kind of girl after all. Messy. Adventurous. Feisty. Impossible to get out of my head.

And that was before she became my accidental roommate.

I just thought I'd mix business with pleasure...I didn’t plan to lose control of my heart.

If only I can convince Bryna I’m not a total bastard. 

(This is Book 1 in the Royals Undone duet. Bryna and Lucas’s story continues in Bastard Prince)