My Sister Stole My Silver-tailed Merman

After my younger sister and I used a mystical potion to become exceptionally fertile, our father sent us to marry into the merfolk tribe.

In my previous life, I chose a burly, rugged silver-tailed merman and consistently gave birth to the highest rank of black-tailed merfolk offspring.

With my status rising due to the prestige of my offspring, I became the crown princess of the merfolk tribe, enjoying immense wealth and a lifespan extending over centuries.

In contrast, my younger sister, who chose a purple-tailed merman, only gave birth to the lowest rank of red-tailed merfolk, enduring…