Wicked Brat by Aria Cole

Leigh Everett has spent the last few years dodging the seductive charms of Asher Hunt. The way his intense gaze tracks her across a room leaves tingles erupting in places they’ve never erupted before, so now she’s determined to avoid another dance with the devil…no matter how hot under the witch’s hat he makes her.
Until Halloween weekend.
Asher is a man laser-focused on his goals, and since the night they shared a single kiss at his brother’s wedding, his goal has been singular: sweeping little Leigh Everett off her feet. But with an age difference wider than the Great Wall of China and his brother’s overbearing gaze always watching, Leigh might as well have a “do not touch” sign hanging around her neck.
And then that wicked little witch costume happened…