An 18-year-old high schooler is forced to move in with her mom's new boyfriend and his 20-year-old college student son. She and the son don't get along. He's constantly being a jerk and teasing her... until one night when she sneaks out to get drunk with her friends to celebrate the end of senior year in high school, she comes home and can't resist giving him a taste of his own medicine and teasing him back. One thing leads to another and they find themselves overstepping the boundaries. She finds herself falling for him, but he's never been one to settle down so when it's time for her to go away to college when summers over, he lets her leave until he realises his mistake.