(Not my original idea) It’s 4 years after the war. You and Draco had a one night stand before the battle of Hogwarts, just two people seeking comfort and strength to get through the war. The one night stand led to a pregnancy that you hid, never letting Draco know it was his child. You even go so far as to charm your son’s hair to hide the shocking Malfoy white, turning it to a soft brown to match your own.