Snarry. Explicit. Four short stories from the fanfic universe of The Boy Who Lived A Bit (https://www.wattpad.com/story/97270409-the-boy-who-lived-a-bit-snarry) and its sequel Care of Magical Teenagers (https://www.wattpad.com/story/98044353-care-of-magical-teenagers-snarry). The stories are: Wrong On So Many Levels Magic, Actually Gryffindor Points Happy Birthday, Severus [A note on canon: This universe was begun prior to the release of book 6 and is therefore canon-compliant up to book 5. It is set in the years after Harry finishes school.]
4 parts