Topic: Halloween story idea

Had a story idea for Halloween but my plates too full with my backlog of writing so ill leave it here for anyone who would like to write it.

A Halloween (or Belial equivalent) costume  party is holding a costume contest with an extravagant prize.

3-4 friends (gender not important)  spend a large amount of money on a temporary fusion transformation becoming a monster or beastly creature.

They win the contest and the person in most control of the  body reveals that the transformation was permanent and the others are powerless to do anything about it.

Anyways I hope someone takes this idea and dose something with it, thanks for listening ^^