Game of Thrones: I Have a Witcher Teacher

He comes from the north, followed by thousands of people. He is an illegitimate son and the son of a dragon. He is the White Wolf Lord and a demon hunter. Years later, Jon Snow and Daenerys meet in King's Landing. "I am the Mother of Dragons and I cannot have children." Daenerys looked at Jon and said. "I'm a witcher, and I can't have children," Jon said. "It seems that we have the same troubles and sorrows. We are a destined couple, but how can the Iron Throne be passed down?" Dany asked. "Don't worry, I have several brothers, Robb, Bran, and Rickon. They are all my brothers. I can let them or their descendants sit on the Iron Throne." Jon said.