The Substitute Bride

I want to write this, so I'll write this one first. Whatever.

Still from a first-person point of view.

Basically, a younger twin brother takes the place of his brother, who died in a car accident, and marries the male lead.

A story about thinking you are walking down the aisle with the person you love, only to learn that the one beside you is a substitute.

Theme: There is no question of being a substitute or not. The only question is whether you love them or not.