Hi so these are some of the fics that I adore
Name: The Echo of Silence by SnapeIsMySpiritQuill
Link:
https://archiveofourown.org/works/62116597
Description: The boy appeared as a small, crumpled figure in the cupboard, barely illuminated by the ghostly spell. His wild, unruly black hair stood out even in the dim light, and his broken glasses perched crookedly on his nose. He was painfully thin, his clothes hanging off his frame like sacks. Severus’s sharp gaze lingered on his face—too young, too frail. The boy should have been around seven but looked no older than five.
Name:The adventures of Snape slowly adopting Harry Potter by Flumet
Link:
https://archiveofourown.org/series/2866546
Description: A series of one-shots that follow Severus as he first takes care of Harry "temporarily" and then slowly becomes his adoptive father.
Most one-shots can be read as stand alones.
Name: Whispers in the Castle by aspionage, BinteMuhammad
The link: https://archiveofourown.org/works/56650909
Description:While trying to escape from Dudley and his gang, nine-year-old Harry Apparates himself to Hogwarts instead of the roof of his school. Thrilled by his magical surroundings and the lack of vindictive Dursleys, Harry decides to blend in amongst the students so he can stay in the castle forever.
Meanwhile, Severus tries to make sense of a new, tiny first-year whose name he can't quite place.
Name: Harry Potter and the Fairy Godmother by beanclip
Link:
https://archiveofourown.org/works/51516808
Description: Harry Potter comes home from school one day to see a sandwich and a book waiting on his cot. His book says that magic is real, and if magic is real, then fairy godmothers must be, too. She may be shy, and she may be invisible, but she brings him books and marks his homework and writes scathing letters when he does something dangerous, so he knows she loves him, and he loves her too.