Revenge — E.M. Denning

On the heels of a horrific break-up, Summer is looking forward to having a couple of months at home to lick her wounds. After a run-in with her ex leaves her reeling, she does something she's never done before -- has a one-night stand. Hunter watched Mitch treat Summer like crap for months, so he was relieved when they broke up for good. Even better was when she invited him to her dorm room the night before they left campus for the summer. The morning after comes with a surprise neither of them saw coming -- Summer has a new stepbrother. Hunter.