Both picture and the story are gift for  cyberfox

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For the story I wrote with AI, nowadays AI can provide a framework according to the template, but most details still need to be modified.

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Yona, a student of Friendship School, walks through the portal and finds herself in a strange plain surrounded by tiny human cities. What's more strange is that her horn has disappeared, and the cloven hoof has become a horse's hoof, and her body is not as big as she used to feel (although she is actually very, very big)
Yona was afraid at first because she didn't know what had happened. She tried to stand where she was, but her body was too big, and unintentional movement would make her hooves almost cover the whole city. She was frightened because she didn't want to destroy the city. It is almost impossible for Yona, who used to be a yak but has just become a pony, to act without causing damage.
She wanted to leave the place, but she didn't know where to go. She walked slowly, trying not to step on anything. But no matter how she walked, some people would fear that her hooves would destroy the city. She felt very sad because she didn't want to hurt anyone.
So she decided to go to a remote place, hoping to find a safe place without a city. She walked for a long time, and finally she found an empty grassland. She decided to stay there for a while until someone could deal with the magic accident
Yona lived alone on the grassland for a long time. She got used to her body and began to like the feeling of being a pony. But she was worried. She didn't want to frighten anyone any more. She began to think of ways to protect her from destroying the city when she walked.
She thought of a way to practice walking on the grassland to make her pace more gentle. She practiced for a long time, and finally learned how to step on the ground gently without causing too much vibration. She is very happy, because it means she can go back to the city now.
She decided to return to the city, hoping to make citizens no longer afraid of themselves. She stepped softly to the edge of the city and smiled at the citizens.
The citizens soon walked out and saw the huge pony. They were a little scared, but Yona's eyes were friendly, so they decided to get closer. Yona told them that she had learned to walk without causing shock, and that she was very kind and would not hurt anyone. After listening, the citizens began to trust Yona slowly.
Yona is very happy. She knows that she has finally won the trust of the citizens. She decided to live in the city and help people solve their problems. She found her huge body very useful and could help people solve many difficulties.