Yes, there are quite a few. You can try searching on fanfiction websites like Archive of Our Own. Some of them might have really creative takes on Hermione being a pixie, with interesting storylines and character developments.
I once had a friend who decided to go from long hair to a pixie cut. She had always been known for her long, flowing locks. But one day, she just wanted a change. After getting the pixie cut, she said she felt so much lighter and freer. It was like a new beginning for her. She received a lot of compliments too, which boosted her confidence.
One possible plot could be that Hermione is turned into a pixie by a spell gone wrong. She then has to figure out how to reverse the spell while dealing with the challenges of being a pixie, like learning to control her new flying abilities and small size.
I'm sorry, I don't actually know the specific 'Brutus and Pixie' story. It could be a very unique and perhaps privately created story. Maybe it's about two characters, Brutus and Pixie, who go on adventures together, or face challenges in a fictional world. Without more information, it's hard to say more.
It usually has magical and enchanting settings. The pixies might have special powers and go on adventures. Also, the stories often have lessons or morals.
Well, perhaps there are stories about pixies' magical adventures. They might use their magic to help the forest animals or play tricks on humans in a friendly way.