Robby walks into the bathroom to shave thinking it's his wife in the shower, but – whoops! It's his wife's friend, Nina Skye, who's staying the weekend for the high school reunion. She's not as embarrassed about it as he is, and in fact, Nina, in a towel, puts her hand on Robby and tells him that she's been dying to exact revenge on his wife ever since she stole her boyfriend in high school. Awkward, yes, but when Nina unfurls her towel to reveal her naked, horny body, Robby knows he's doomed to fuck her and help avenge his wife's wrongdoing.