Percy and Nico are sent to Hogwarts School of Witchcraft and Wizardry by Hecate to research on dementors, and the task seems simple enough at first since the castle is surrounded by them. However, when Sirius Black breaks into the castle, they must find out the flaw in dementors and make a decision - Fix the flaw and help Hecate, or help Sirius and become her enemy.
Crossover - Harry Potter & Percy Jackson and the Olympians - Rated: K+ - English - Adventure/Friendship - Chapters: 2 - Words: 1,835 - Reviews: 12 - Favs: 12 - Follows: 30 - Updated: 12/17/2016 - Published: 8/13/2016 - Harry P., Sirius B., Nico A., Percy J.