Harry should, maybe team with Slyvia to get back at Paddy and Moonie. With the use of a boggart and the redikulas spell Harry could cause the boggart take the shape of Paddy dressed as a S&M submissive. Photograph the scene and release the photo to the media, under the premise of 'The Fugitive paddy Black' seen here. As for Moonie, Snape could alter the wolfsbane potion so that every time she transforms, she is either besieged by biting fleas or she suffers an unbearable itch. Fair is fair and that would be.
Peace