Naughty by Nature. The Naughty and Nice Series, #1

Tessa Tyndale is known for her naughty nature. Although she's a high school teacher she's no angel. She's been guilty of a prank or two. And then she meets Wolf Spencer, gloomy and serious, the very opposite of Tessa's idea of the ideal mate. But, strangely enough, this is the man who makes her heart race. Now if only she can change him from grumpy to fun-loving...it's a challenge that she's willing to take on.
With Tessa, anything is possible. Wolf Spencer is intrigued by the petite blonde pixie he meets at his friend's wedding. But when he tries to make friends he's surprised to find that she's not at all interested in him. And then he realizes that she's nothing like what he'd thought. Far from being demure, this woman is daring and bold and not at all afraid of playing tricks on him. Wolf soon finds out that around Tessa nobody is safe, especially not him...