Y/N Riddle is a year younger than the main Slytherin group and the younger sister of Mattheo Riddle—Theo’s chaotic and fiercely protective best friend. Y/N has been secretly pining after Theodore Nott for months, harboring feelings, but he is strictly off-limits, not only because of Mattheo, but because Theo currently has a girlfriend who keeps him on a tight leash, especially tonight during the victory party.