Draco’s and y/n have always been best friends since their children. But when y/n chose to fight against Voldemort. Draco felt betrayed and hated her, calling her a blood- traitor. During the battle , Draco almost died at the requirements room surrounded by the fire, when y/n saved him and grab his arms at the last second before he could fall then she leaved without a glance at him. 5 months after the war, she was walking in diagon alley when she collided with him.