Harry Potter Hostage Rescue

This cartoon idea goes off on a brief tangent from Ranma 1/2 to Harry Potter. The setting is the merfolk village at the bottom of the lake during the second task of the Triwizard Tournament. Harry Potter, with gills and webbed feet, has just arrived and is staring in awe at the four hostages. Each of the four hostages is bound to a pole with their arms behind their backs, and possibly their legs bound as well. Three of the hostages, as in the books, are Cho Chang for Diggory, Hermione Granger for Krum, and Gabrielle Delacour for Fleur. Except Gabrielle looks more like a developing 12-year-old than the 9-year-old or whatever she was in the books. Harry's hostage, instead of Ron Weasley, is Harry's Patil-twin date from the ball (which I prefer to imagine is Padma Patil rather than Parvati, but it hardly matters since they're identical twins). These four girls were all abducted from their beds to be used as hostages, and therefore they are all wearing nighties and nothing else. And naturally the waters of the lake have plastered these nighties to the girls' bodies and turned them transparent. Not to mention the effect of the cold water on nipples. All four girls are in enchanted sleeps, and are thus unaware of Harry staring at them — i.e., ogling them.