Crashing the Halloween party (Patreon)

Hi there! Here's a bigger story to finish the month (about 7 800 words). It all started from an idea from my patron Lady Stardust, which made me want to make a bigger story out of it, with more transformations. 

In this story, a rich girl is hosting a Halloween party at her appartment. When a girl dressed like a witch knocks and asks for candies, she tells her to fuck off. What she doesn't know is that this girl is an actual witch in disguise, looking for someone to mess with. And now, her life and that of her friends is going to get ruined in horrifying and creative ways.