Well, perhaps bpy is in an experiment gone wrong in a science - fiction setting. The experiment causes a biological change that turns bpy into a girl. At first, bpy is confused and scared. But as time goes on, bpy starts to explore this new identity. She might make new friends who help her understand what it means to be a girl. She could also get involved in activities that are more common for girls, like dancing or art, and in the process, find a new sense of self.
There could be a wise old wizard who tries to reverse the transformation or at least guide bpy through the process of being a girl. Another character might be a best friend who accepts bpy immediately regardless of the change and helps bpy with all the girl - related stuff like choosing outfits.
One possible plot could be a magical transformation. Maybe the boy stumbles upon a mysterious spell or enchanted object. For example, he finds an old amulet in an attic. When he touches it, he is suddenly transformed into a girl. He then has to navigate a world that he previously only knew from the outside as a boy. He might face challenges like how to dress appropriately as a girl, how to interact with other girls in a new way, and deal with the different expectations society has for girls.
It might be a story where a boy, through some scientific experiment gone wrong, becomes a girl. As a girl, he discovers new aspects of his personality and relationships. For example, he may find that his friendships change because of the transformation. He could also face challenges in school or at home as people around him adjust to the new him.
In a 'girl becomes man tf story', it might start with a strange dream. The girl dreams that she is becoming a man night after night. One day, she wakes up and realizes that the dream is starting to become a reality. Her body is changing, her emotions are shifting. She has to deal with not only the physical changes but also the psychological ones. She may struggle with her new self - image at first, but as time passes, she finds strength in her new identity and uses her unique experience to bridge the gap between genders in her community.
In a 'sonic becomes a girl fanfic', the story could start with some kind of magical or scientific accident that turns Sonic into a girl. She then has to navigate her world with a new body. She may discover new abilities or limitations. Perhaps she teams up with female characters in the Sonic universe more often now and they form a strong girl - power group to take on the bad guys. There could also be a focus on how Sonic adjusts to her new appearance and how it affects her relationships with characters like Knuckles, who may have a different dynamic with her now.
In a 'sans becomes a girl fanfic', perhaps Sans - now a girl - decides to use this new form to her advantage. She could try to infiltrate a group that was previously only male - dominated in the Underground. This would lead to a whole series of adventures as she tries to keep her true identity a secret while achieving her goals.
Well, it could be about Ash waking up one day as a girl and having to deal with all the changes in his, now her, life. Maybe she has to adjust to new social dynamics, different reactions from friends and rivals, and also how to handle Pokémon battles in a different body.
Well, it could be about Ben 10 being transformed into a girl and then having to deal with the differences in how society treats him/her. Maybe he/she has to face new challenges in using the Omnitrix while being a girl.
Well, maybe Ben 10 gets transformed into a girl by some alien device malfunction. Then he has to deal with all the new experiences like how people treat him differently, and he might discover new powers related to his new form.
Well, it could be about Steven having some sort of magical or scientific accident that turns him into a girl. Then he has to deal with the new body, different social expectations, and how his friends and family react to this big change.