When Holly's mom goes to live with her new boyfriend for the summer, sixteen year-old Ben and Holly turn a parentless house into their own private universe. They swim in the pool, cook in the kitchen, play dress-up in Holly's parent's clothes, and ultimately lose themselves in their interpretation of adult life. While Holly looks to Ben for the love and attention that is absent from her life, Ben fumbles through his first sexual relationship, unaware of the emotional complexities. These complexities, coupled with a growing interest in Holly's older sister, teach Ben a valuable lesson about the responsibility of love.