Basically this is when Father, I Want to Marry My Brother goes horribly wrong. For some reason a person really does want to marry their sibling. Even though they understand what that means. This is most commonly depicted in the form of a younger sister who has developed some sort complex or obsessive attraction to her older brother. Perhaps because he protects her. Or maybe because he's the only man in her life that she feels safe with. May or may not be a factor with a Little Sister Heroine. Examples of Big Brother Attraction include: