Under His Touch (Falling Under #2)
Jeffe Kennedy

Alexander Knight prides himself on his integrity and self-discipline. After all, he hasn't risen to the position he enjoys by indulging his whims over ambition. He also isn't blind. He's certainly noticed his sharp, young assistant is hot as hell. His self-imposed sexual hermitage doesn't stop him from watching her. And endlessly fantasizing.
The day Alec's cool reserve cracks and Amber catches a glimpse of something simmering beneath his apparent indifference is the day everything between them changes. Alec gives her what she's been looking for sexually—as masterful in the bedroom as he is in the boardroom. He finds himself in the grip of an affair that tests even his boundaries, while Amber's new role as willing student pushes them both past any consideration other than mutual longing.