YAY! this was my prompt, and I'm so, so glad to see it complete! Your Snape cat is perfect... I love all the different ways he expressed his displeasure (the fur bomb, the hairball, etc.. ). The mystery was a great way to keep the story going, and I like how snape and harry not being allowed (technically) to help, brought them closer together.
For all Snape's yowling and scratching, what a cute, sweet story!