Swapped Fates, Vengeful Hearts

In a past life, I was a pawn in the imperial harem, dying tragically pregnant and betrayed. My sister, forced into a brothel, suffered unspeakable humiliation before taking her own life. When fate granted us a second chance, returning to the cursed day our constitutions were forcibly altered, we made an audacious decision: to swap our destinies. I, once destined for the harem, now possess the succubus physique, ready to turn the brothel into my weapon. She, once a succubus, will enter the treacherous imperial palace with my highly fertile constitution. The power struggles of the court and the brutal rules of the brothel now become our stages for vengeance. We will use our bodies and wits to transform past suffering into strength, making those who manipulated our fates pay a bloody price. But in this dangerous exchange, can we truly control our destinies, or will we merely become pawns once more?