The Dragon King Bloodline of Hogwarts

At eleven, Viserys Targaryen learned two things: the dead could rise again, and his blood could burn. He fell from Westeros into the magical world's lake with his three-year-old sister and a Valyrian steel dagger. The headmaster of Hogwarts told him that his ancestor Daemon had foretold his arrival a thousand years ago, leaving him a manor, a dragon egg, and an unfinished journey home. The priests of the Lord of Light, the remnant of Voldemort, the scheming pure-blood families—everyone wanted what he held. The dragon egg needed to hatch, his magic needed to be restored, his sister needed protection, and Viserys needed to understand one thing among these wizards: Targaryens don't swear allegiance; they only make people kneel. PS: A fanfiction of A Song of Ice and Fire and Harry Potter.