My HP Raises a Professor: Saved Little Snape at the Beginning

Jiang Xiaoyu traveled through the HP world and was bound to the "Magic Companion Development System". When he was five years old at the beginning, he picked up little Snape who was covered in injuries on a rainy night. "Don't be afraid, I will support you from now on." He used the system's treasury to buy the Diagon Alley store, and used the prophet plot to pave the way for him to magic. In Hogwarts, he raised a gloomy and lonely wolf cub into a potions master who was only loyal to himself. Double agent? Horcrux hunting? Foretelling a crisis? Jiang Xiaoyu sneered: No one can touch the people I raised. Many years later, in the cellar, the potion master pushed him against the wall, his black robe rolled with the scent of medicine wrapped around him: "Xiaoyu, was this why you saved me and raised me?" Jiang Xiaoyu hugged his neck and smiled as if for the first time: "What else, Professor?" ——I came here not to save the world, but to raise you, my Severus. ---[Redemption and development + system cool text + subversion of the original work, see how the fishing-type time traveler pampered the young professor into a loyal dog boss]