At the beginning of their senior year in high school a guy and girl who had been best friends since preschool learn that her dad and his mom are getting married. All their lives they had been friends and had never thought of having sex with one another. That is until they hear about the upcoming marriage. With the news feelings that they've been keeping hidden inside emerge. So they finally decide to have sex with one another as many times as they can before the wedding. The mother decided to make her soon to be daughter-in-law the maid of honor. She takes the girl with her to try on dresses. The girl is surprised when the mom even has her try on wedding dresses. And is told to pick out her favorite. So they both take home a wedding dress. The dad makes the soon to be son-in-law his best man. As the day of the wedding comes closer the two young lovers come to realize they love one another but have to put their sexual life to an end and they're sad that they can't live as man and wife. The son is at the wedding and in place of the best man. As soon as the wedding music starts the dad quickly switches places with him and the son is confused at first. Then he looks back and sees his mother walking out in Light blue. His best friend's favorite color. And eventually he sees his best friend walking out in a wedding dress. The man he was preparing himself to call dad soon leans in and says surprise. After he marries his best friend his Mom and her Dad had told them that they had noticed how they looked at one another and they knew that the two young lovers didn't even realize their own feelings for one another. And because they had been planning on going to college in different ends of the country the mom and dad had set up the fake wedding for themselves and waited for the true feelings to come out. They almost called the thing off because it took so long for the two young people to realize their feelings and become lovers. The new bride said that the wedding came just in time because she was now pregnant.