What is the fanfiction when harry gets re-sorted into slytherin after a summer of torture and abuse by his uncle eventually harry is fostered by snap whilst be-frending Draco and Blaise?

The fanfiction you're describing sounds like a common trope in the Harry Potter fandom, often featuring themes of trauma and redemption. In these stories, Harry's difficult experiences lead him to be re-sorted into Slytherin, where he finds support and friendship with characters like Draco Malfoy and Blaise Zabini. Severus Snape often plays a pivotal role as a foster figure, providing Harry with guidance and protection. This narrative allows for deep character exploration and the development of new dynamics within the Hogwarts setting.