Stole My Glory and Fiancé? Now Bow to the Duchess!

Cecily Veyne, the illegitimate daughter of a noble house, has lived her whole life overshadowed by her older sister Lavinia. The source is clipped, so I will stop at what it establishes: Cecily has long been pushed into Lavinia's shadow, and that long-standing resentment sets the stage for everything that follows. Her quiet endurance is about to give way to a fight for the recognition she has always been denied.