Tom Riddle/Voldemort

Miranda Forst is a young witch who, one day, accidentally activating an ancient spell, travels back in time, finding herself at Hogwarts during Tom Riddle's youth.
Miranda and Tom unwittingly become closer to each other, allowing them to become more than friends.
However, fate takes an unexpected turn: returning once again to her own time, where war rages, she will have to face the old Voldemort, now firmly established in his role as the Lord of Darkness.
(the idea is not mine!)