Harry Potter and the New Outlook

During the Battle at the end of his fifth year, Harry accidentally jumps through a Time Turner, sending him back 52 years an alternate dimension. He inevitably interacts with Tom Riddle's counterpart, and when he returns to the present and his own dimension a year later, he's a changed man. Luckily (or perhaps unluckily) for him, he isn't alone: he was followed back. Harry/fem!Tom.