Rhaego : The Child of Ashes

Rhaego Targaryen died before he was ever born. That was how the story was supposed to go. instead, he awakens in the ashes from the flames with scales beneath his skin, wings at his back, and carrying memories that do not belong to this world. As Daenerys Targaryen builds her path through Essos, her son grows at an unnatural pace, learning power far beyond even her dragons. But the world is not kind to things it does not understand and Westeros even less so. Far to the North, war gathers. Old enemies rise. And the choices made by a boy who should not exist may change the fate of kingdoms… or burn them to ash. The game has changed. This time, the silver queen has an heir. — Description from novelcodex.org