Five years after Voldemort's defeat, Harry returns to England to help re-open Hogwarts.

"Freeport colony: a notorious den of pirates, smugglers and thieves. Wufei persuades one of its denizens, his one-time ally Duo, to help him catch a killer hiding there. Agent Chang thinks he knows what to expect, from this case, from Freeport and from Duo Maxwell. He couldn't be more wrong."

All you need to know about this series is that the doc is titled "The Sex Buddy Fic". A series of 'made-them-do-its' which ended up telling a much bigger story.