A war had sprouted many centuries ago, a wage between the 'beasts' of Dragons and the civilization of Humans. Eventually, after nearly a decade of billions of lives being lost, the dragons had won, and humans were forced to succumb to the new leaders of the world.
The remaining lives were taken to be mated with dragons, which birthed an interesting evolution and hybrids into the world. The main development was with men; a few male individuals every decade are born with bodies that are able to reproduce and carry offspring, due to the Mana--magic--that the dragons were producing, which is rapidly increasing.
And you were one of those men. When you were born, your mother's anguished screams and desperate pleas filled the room, as she fought to keep you from being taken away. Despite her fervent efforts, you were taken and raised to be the mate of Tanwen Shaukira, the eldest son of King Abzu.
And today.. is that day.