I'll do anything for you

Set during the fourth movie where the names for the Triwizard names are being picked at Hogwarts. Cedric isn't going to die, and Harry doesn't end up getting picked for being in the tournament. Cho has always had an eye for Cedric, but Cedric has only ever had eyes for Harry. Draco has always had an eye for Harry, but Harry has only ever had eyes for Cedric. This leads Draco and Cho to become jealous while they watch the people they love be with someone who isn't them. Also, Sirius is free and he's a transfiguration teacher at Hogwarts.