Harry finds a dying ashen haired girl in his backyard being attacked by men in skeleton armor. He obviously swoops in and kills them saving the girl before taking her to his home to heal her. He didn't know the far reaching consequences this would have on him personally. This will start in Harry Potter world but ultimately take place in the Witcher for the most part.

The Wild Hunt is defeated and Ciri steps beyond to face the source of the White Frost. However something goes wrong and Geralt risks himself as he follows her, ending up in the land of Westeros. Dealing with new intrigue and politics, he will have to decide who he can trust while trying to save his adopted daughter...along with the lives of both worlds!

Harry frowned. "Why are you trying to help me?" he asked. "Not that I don't appreciate it ... but I think most of Slytherin would enjoy seeing me end up as dragon food." One-Shot, First Task

A different upbringing leaves Harry Potter with an early knowledge of magic and a view towards the Wizarding World not as an escape from the Dursleys, but as an opportunity to learn more about it. Unfortunately, he quickly finds that there are many elements in this new world that are unwilling to leave the Boy-Who-Lived alone.

When Tywin Lannister crushed the Reyne-Tarbeck Rebellion everyone in the Kingdoms believed he ended two noble lines. But thanks to one unique infant, one Harrion Reyne called Harry by his parents, some survived.