After My Rebirth, My Sister Took Away My Position as Crown Prince and Heavenly Concubine.

The Tianjun clan is all water-based dragons, but they gave birth to a fire dragon offspring, and the water-based dragons could not marry it, so I, the fire-based koi, became the crown prince and concubine, giving birth to the only child of the heavenly clan. Out of jealousy, the twin sister shattered my spiritual veins and drained my child's immortal marrow. Our mother and son were both soul-destroyed. When I opened my eyes again, I went back to the day when the prince of the Celestial Clan was choosing his concubine. My sister was the first to recommend herself to the pillow mat. That's fine, but if she doesn't sit in that position herself, how can she know what life is worse than death?