Nothing Like the Sun

Hermione had never had much patience for Tom Riddle. He was a model student, and everyone could vouch for him being the nicest Slytherin they knew, but how nice could he be if he cornered his friends in dodgy alleys and caused them inexplicable pain? (Or, Hermione follows the Muggle admonition that she keep her enemies closer a little too strictly to the letter.) HG/TR, 1990s AU.