Clutch (Custom Culture #2) by Tess Oliver

Clutch
When Taylor Flinn's parents shipped her off to an aunt for her last year of high school, James "Clutch" Mason had convinced himself it was for the best. Taylor, the wild, impulsive and far-too-appealing seventeen-year-old had been driving him nuts. Her school girl crush on him had been the last thing he needed. Now he had time to concentrate on his booming classic car part business, his new found love-- drag racing, and keeping his twenty-year-old brother Barrett out of trouble.

But when Taylor returns from her aunt's more grown up, utterly seductive, and attached to another guy, Clutch realizes that the only thing he ever needed or wanted was Taylor Flinn.