Who's the Boss? — Jill Shalvis

CAITLIN TAYLOR
Having inherited nothing but a stack of bills and--horrors--an office job, Caitlin was suddenly a poor little rich girl. Worse, her new boss was temptingly gorgeous, but needed a major attitude adjustment.... He seemed to think she was some sort of airhead, just because she didn't know her way around a filing cabinet.

VS. JOE BROWNLEY
There was nothing Joe needed less than to be inflicted with Caitlin Taylor--blond bombshell and Calamity Jane rolled into one! He would have fired her after the exploding coffeepot incident, but he'd promised her father he'd take her on. And besides, even while she was turning his office upside down, he couldn't help wondering how it would be to take her on after hours.

WHO WOULD COME OUT ON TOP?