Sirius' Wicked Revenge

Sequel to Sirius' Naughty Habit. Sirius has found the perfect way to get revenge on his lover whilst doing something good and naughty. How could Harry complain? A challenge is agreed between the two and it's left to Harry to find out just who will star in the eleven remaining slots. Will he succeed or will Sirius succeed and keep it from Harry until the end? Slash and het pairings.