The Drive — Erin M. Leaf

Liam is done with love, but his daughter Portia has other plans. When he arrives to pick her up from college, she sets him up with her friend Charlie, and merrily heads off to her internship without them. Liam is left with an uncomfortable hard-on for Portia's bestie, and a long drive to Vegas with a guy too young to know what to do with a guy Liam's age.

Charlie thought he liked girls. More specifically, he thought he liked Portia, but when her dad offers him a ride home after graduation, he suddenly, shockingly realizes that he doesn't like women at all. He likes Liam, and he wants to hook up as soon as possible, and maybe not ever let go. So, when Liam makes an offer he can't refuse, what's he supposed to do? Say no to the hottest person he's ever met?