Well, where on earth do I start? This is quite possibly the funniest thing i have read in a very, very long time. Practically every other line had me laughing out loud and at some points, I could barely catch breath.
Just everything about it; cute kitten Harry, cow Hermione and fish Ron were hilarious. harry's split cat personality with all the names, the hideous sexual goings on at the Manor, so much, so good, so brilliant. Your Snape dialogue was perfect, and all of Harry's cat antics..priceless.