Once upon a time, a fairy decided to teach an arrogant boy a lesson. The boy, Trevor, who was known for his cruelty towards his 9-year-old sister Emily, was transformed into a 4-year-old girl named Tracy.

In the new reality, everyone believed that Tracy had always been Emily's younger sister. Only Emily remembered her once cruel big brother and the fairy's intervention.

Over the next year, Emily took the role of the big sister seriously. She was a loving and patient sibling to Tracy, whom she'd once feared as Trevor.

Tracy, however, was anything but grateful. She became a bratty and unappreciative younger sister, throwing tantrums and causing mayhem.

After a year, the fairy paid a visit to the sisters, hoping Tracy had learned her lesson. Seeing her unchanged behavior, he left, leaving Tracy trapped in her new life.

Tracy tried to forcefully make Emily take responsibility. Emily, shocked by such an act, lost all love she possessed for Tracy.

The once gentle Emily started to retaliate and became a tormentor herself. She bullied Tracy until the little girl cried and sought comfort in their mother's arms.

Emily even included her friends in her newfound cruelty, making them target Tracy as well. As a result, Tracy became the new victim of torment.

Tracy attempted to apologize to Emily several times, but Emily's heart had hardened. There was no ounce of love left in her for Tracy.

Emily's actions made Tracy fearful of the dark. The girl, once a cruel boy, now cowered in the shadows and whimpered in the night.

When their parents were away, Emily would lock Tracy in a dark room for hours, leaving the little girl to face her worst fear.

This cycle of torture continued for many months, until one fateful day when Emily found Tracy, huddled in a corner, crying her heart out.

Unexpectedly, Emily felt a pang of conscience. Seeing Tracy weeping so pitifully stirred something in her. She was reminded of the time when she herself was the victim of Trevor's cruelty.

Emily realized that she had become the monster she once despised- her brother, Trevor. The realization hit her like a slap in the face.

That night, Emily cried for the first time in a long while. She wept for the lost time, the pain she had inflicted and the mistakes she had made.

The very next day, Emily approached Tracy. It was the first time in many months that she had not treated her with malice.

Emily apologized to Tracy for her ruthless behavior. She promised to be a caring older sister, just as she had been before all the cruelty started.

For Tracy, this was unexpected. She was bewildered by Emily's sudden change of heart. She hesitated, wondering if this was some sort of trick.

Emily’s actions, however, were sincere. She started to treat Tracy kindly, protect her from their friends' pranks, and even comforted her during her fits of fear.

Tracy was cautious at first, but eventually started to believe in Emily's transformation. The sisters began to form a bond that was stronger than ever before.

With time, Tracy became more confident and less fearful. Emily's love and affection began to melt the icy shell around her heart.

Emily kept her promise, and never returned to her cruel ways. She became the loving big sister Tracy needed, and they both started to heal together.

One day, the fairy visited again. He was pleased to see the change in Emily and Tracy. He decided to forgive Tracy and prepared to lift the spell.

Before he could act, Tracy asked to remain a girl. She confessed that she was happier as Tracy than she had ever been as Trevor. She also didn't want to break her bond with Emily.

Emily stood by Tracy's decision. Their love for each other had transcended their previous resentment, and they both wanted to cherish this sisterhood forever.

The fairy granted their wish. Henceforth, they lived as sisters, relishing the joys of their bond. They forgave, loved and learned the real value of compassion.