In some stories, the natural order of things might be disrupted. There could be a disturbance in the balance of magic in the world. This imbalance might randomly select the girl and transform her into a dragon. Or perhaps she enters a magical realm where the rules are different, and in that realm, her human form is not sustainable, so she is transformed into a dragon as a form of adaptation to the new environment.
It could be due to a magical artifact. For example, if she touches an ancient and cursed dragon scale or a powerful enchanted jewel. These items often have powers that are not fully understood, and their magic can cause unexpected transformations. Also, it might be a self - sacrifice. In some stories, to save her loved ones from a dragon - related threat, the girl might choose to become a dragon herself to fight on equal terms.
One reason could be to preserve the dragon lineage. Since it's the last dragon, it might see the human girl as a way to continue the existence of dragons.
Another possibility is that the girl was being punished. In some fictional settings, dragons are seen as guardians of certain places or secrets. If the girl violated some unspoken rule or tried to steal something from the dragon's domain, the dragon might eat her as a form of punishment.
Once upon a time, there was a young girl named Lily. One day, she stumbled upon an ancient amulet in a hidden cave. As she held it, a strange magic started to transform her. Her skin turned scaly, her hands into claws, and soon she was no longer a girl but a magnificent dragon. At first, she was scared, but as she flapped her wings and soared into the sky, she felt a new sense of freedom and power.
Magic could be the main reason. Maybe she entered a magical realm where such transformations are common, like a fairy - filled forest or an enchanted garden. For example, if she drank from a magic fountain, it could trigger the transformation.
Magic could be a reason. Maybe a wizard or a witch cast a spell on the boy accidentally or on purpose. Another possibility is a strange scientific experiment gone wrong in a fictional world. For example, if some mad scientist was trying to test a new gender - changing device.
It could be magic. Maybe a wizard or a sorceress cast a spell on him for some reason, like revenge or just for fun.
I'm not sure specifically which 'dragon girl tf story' you are referring to. There could be many stories involving a dragon girl and some form of transformation (tf). It could be a story from a particular game, anime, or fan - made creation.
One possible reason could be that the female dragon sees something in the human girl that she wants to preserve in a dragon form. Maybe the girl has a special quality like great courage or a pure heart that the dragon thinks would be enhanced as a dragon. Another reason might be that the dragon is lonely and wants a companion of her own kind, so she turns the girl into a dragon.
The setting of the story is also crucial. Is it in a medieval - like fantasy world filled with knights and magic? Or is it in a more modern - day world where the dragon girl has to hide her true form? The other characters in the story also play a role. Are there people who help her during her transformation journey, or are there those who oppose her because of her new form?
Well, in some stories, it could be a family curse that has been passed down through generations. Maybe her ancestors made a deal with dark forces long ago and as a result, she is doomed to turn into a werewolf. Also, it could be related to a place. For example, if she lives in an area that has a strong connection to werewolf lore, the energy of the land could somehow trigger the transformation. And of course, as mentioned before, a werewolf bite is a classic cause.