Я нашла неплохой кроссовер СПН/ГП. Пейринг Сэм/Гарри, но рейтинг детский.
Мне понравился юмор и то, как Гарри постоянно подкалывает Дина.

Don't Fear The Reaper » by She Who Cannot Be Turned
Harry defeated Voldemort at a cost. He eventually ends up in America, where, eight years after the defeat, he meets two brothers who fight the supernatural…. He certainly isn’t the one they are set to save either. Harry Potter crossover. Slash
Crossover - Harry Potter & Supernatural - Rated: M - English - Supernatural/Humor - Chapters: 10 - Words: 60,542 - Reviews: 157 - Updated: 6-13-09 - Published: 9-26-08 - Harry P. & Sam W. - Complete

И сиквел:
For Whom The Bell Tolls » by She Who Cannot Be Turned
**Sequel to Reaper** When disaster happens, Harry is needed back with the Winchesters. But after what happened when he left, will he return? Slash.
Crossover - Harry Potter & Supernatural - Rated: M - English - Supernatural/Humor - Chapters: 11 - Words: 58,552 - Reviews: 141 - Updated: 6-15-09 - Published: 3-1-09 - Harry P. & Sam W.