The story could be set in a post - apocalyptic world where some kind of environmental factor or radiation causes mutations. The girl is one of the unlucky ones who starts to grow a tail. She has to deal with the social stigma and also find a way to survive in this new world.
The girl is the central character. Then there could be a wise old woman who has knowledge of ancient magic or medicine. And perhaps a group of kids at her school who either bully her because of the tail or become her friends and support her.
Perhaps the story focuses on the girl's journey to master the guitar as a new form of magic. She might face challenges like finding the right strings that can withstand her magic energy. Along the way, she could meet other musicians in the Fairy Tail world who teach her different tunes with unique magical effects.
It could be about a girl's growth in various aspects such as her personal development, her journey of self - discovery, or her progress in achieving her dreams.
Perhaps it could be about a dad who is very supportive as his daughter takes up strength training. He watches her progress in building muscles, which might involve her starting from a normal fitness level and gradually getting stronger through consistent workouts.
It could be about a character who has an extraordinary growth related to their physical feature which is big boobs and how that affects their life and the story around them.
Well, in this story, the mom might start with simple home workouts at first. As the son watches, she progresses to more intense training sessions at a local fitness center. She could be inspired by other muscular women she sees. Her journey of growing muscular may also teach the son important lessons about perseverance and health.
It could be part of a fictional story where magic or some strange experiment gone wrong is involved. For example, if it's a fantasy story, a spell might have backfired on the girl and caused the tail to grow.
A better fanfiction idea for Lucy could be her exploring new Celestial Spirits that are not part of the main story. She could go on a quest to find a powerful and mysterious spirit that has been lost for centuries. This would involve her using her wits, her magic skills, and her connections with her existing spirits.
Well, perhaps the girl is on a journey through a magical land. In this land, there is a special kind of food that she tries. Unbeknownst to her, it causes her to be gassy. As she continues her adventure, the gassiness becomes both a hindrance and a source of unexpected help. For example, the gas might accidentally blow away some bad guys or help her float across a river. And in the end, she discovers a cure for her gassy condition while also making new friends who accept her just as she is.
The girl could be on an adventure and the cat joins her. Let's say the girl is exploring an old forest near her home. The cat follows her and along the way, they encounter various challenges like getting lost or facing some small wild animals. But together, they find their way back home and become even closer friends because of their shared adventure.