Mute Mermaid, But Mutant

My sister and I were reborn on the very day we were to be sent to the Demons as sacrificial vessels. That day, our husbands, the God of Water and the God of Fire, came to rescue us. However, this time, without any discussion, we made the same choice. We refused their rescue and willingly offered ourselves to the Demons. In our previous life, after they saved us, the Demons captured the God of Water's young apprentice as a replacement. In the end, she was flayed and had her bones torn out, dying a brutal and tragic death. Because of that, the God of Water and the God of Fire came to hate my sister and me deeply. They spread rumors that we were the Twin Blossoms of Ruin, destined to destroy the world, and forced us to the point where our souls were completely annihilated. When I opened my eyes again, my sister and I had returned to the moment when the Demons first captured us. We exchanged a glance and then announced in front of everyone, "We are willing to become the sacrificial vessels of the Dark Lord and the Demon King. Take us with you." The God of Water and the God of Fire left with their young apprentice, who was completely unharmed. They were relieved that they had finally protected the one they truly cared about. Only later did they realize their mistake, but by then, they were consumed with regret.