Y/n was a student at hogwarts with the power to wield ancient magic which is rare, she was seeing Matteo Riddle while she was in school. Y/n defeated Voldemort but at a price she had to reveal she could wield ancient magic so she faked her death and fled to America, she was captured by Hydra but was eventually freed by the Avengers who she ends up joining. While in Hydra she loses her memory so she doesn’t know where her power is from, she doesn’t remember hogwarts or Matteo. She begins seeing Bucky, but after a mission gone wrong her ancient magic fires off a message to George Weasley, a friend of hers from Hogwarts. He apparates right into the avengers tower, he sees her struggling to keep her ancient power in check and tells them they have to take her to hogwarts so dumbledore can help her. While there George is explaining to the avengers who Y/N is and what she’s done. Matteo who has become the defense of the dark arts professor sees her.