Maya Banks : Rush : Book one of the Breathless trilogy

Gabe is one of the richest and most powerful men in the country, used to always getting what he wants. When he saw Mia walk into his hotel's grand opening, he knew he shouldn't act on his desires, after all she is his best friend's little sister. Ever since Mia was a teenager she has always had a crush on Gabe. She knows he is too old and too out of her league but she is determined to do something to make him notice her. As Gabe pulls her into his world they begin an affair that is both intense and obesessive.