Y/n is Draco Malfoy's beloved little sister..y/n is Draco’s entire world, she's only 1 year old but it's Draco's responsibility to care for her, even at school. The teachers and Dumbledore are aware of the situation. He takes her to class with him and she has her own crib in his private dorm. Draco treats her like a Princess, the rest of the Slytherins are in love with her as well. Harry Potter on the other hand...doesn't like her and makes it known every chance he gets..one day he takes it too far and tosses her into the Black Lake, in turn she ends up with pneumonia and almost dies. The story starts an hour before the incident, after dinner when Draco had decided to take her out for a walk by the lake.