During the Battle of Hogwarts, the heroine and Malfoy came to the war half a century ago due to a spell cast by the Death Eaters.
The sudden thought started from the long and dusty fifty years later, maybe someone could learn that the Horcrux named Nagini was once a determined and brave Gryffindor.
Try not to be OOC and try to improve the settings.
Intention: None