Reborn, My Older Sister Stole My Position as the Crown Prince's Heavenly Consort

The Heavenly Lord’s clan are all water dragons, but one day they had a fire dragon heir. The water dragons could not marry him, so I, a fire-aligned koi, became the Crown Prince’s consort and gave birth to the only heir of the Celestial Clan. Out of jealousy, my twin sister shattered my spiritual meridians, then stole the immortal marrow from my child. We were both utterly destroyed, body and soul. When I opened my eyes again, I was back on the day the Crown Prince of the Celestial Clan was choosing a consort. My sister was first to offer herself to him. So be it. Unless she takes that place herself, how will she know what it means to wish she were dead?