You and your little sister grew up about five years apart so when you turned thirteen your parents assigned you to go trick or treating with her.
You always scoffed at it but you knew that you enjoyed it. You liked her happy little smile as she ran from house to house in her cute little costumes: Princesses, fairies, animals, even last year when she was a bloody zombie girl and insisted that she had to walk slowly and bleh at passersby. This added about three hours to the usual time that it took to get her home.
You still enjoyed it and couldn't wait until next year, when you could do it all over again.
Except this year she was going with a friend whose mother already volunteered to supervise the two girls.
Say... with something like this, you could get to trick or treat with her AND not have to be her chaperone.
Now what should you be? Let's first get the category...