Julie, who is 17 year old had a sister, Allie. Allie was 18 years old and had the perfect boyfriend! His name was Justin, who was also 18 years old. 1 year older then Julie and 3 months older then Allie. Julie has liked him for the longest. What happens when they start to date behind Allie's back? What happens when Allie finds out? All that remains a mystery. My Sister's Boyfriend...All Rights Reserved