Harry vs The Donkey

It's Teddy Lupin's fifth birthday and all Harry wants is to give his godson a great party. But now a menagerie of animals has escaped from their pens, the birthday cake is all over the floor, and Harry is stuck helplessly in the middle and trying to avoid the donkey he swears has it in for him. For the Cluedo/Clue challenge with prompts 'Harry Potter', 'Donkey' and 'Helpless'.