there's a cruelty to your kindness (слэш)

During Tom Riddle's fifth year, an unknown person thwarted his every move. This person and their beautiful stag patronus know each step he takes. With each interaction, he feels pulled apart and changed. But he cannot decide whether they are friend or foe.
Five years after leaving Hogwarts, Harry Evans had found himself finally gaining the unwanted attention of Tom Riddle. He had spent years in Europe dealing with the aftermath of Grindelwald's war and had become known as quite the procurer of difficult-to-find items. The item that Riddle wanted him to acquire? A wizard with a stag for a patronus.