Redeeming Shadows

Hermione's experiment with the artifact brings a young Tom Riddle from an alternate timeline. Tom's initial distrust and adaptation to the future, and Hermione's efforts to integrate him into society while keeping his identity a secret.
Working together on research to find a way to send Tom back, leading to deep intellectual and emotional bond. Tom learning about his future actions as Voldemort and grappling with the horror of his potential. Growing attraction between them and the complications it brings, given Tom's potential return to the past.
Tom's ultimate choice between returning to his time with the knowledge to change his future or staying in the present to forge a new path with Hermione.