You were walking your usual route from school to home, passing by the shops and such. Thinking about your life as a boy, about how tough it was, how you were always bullied, and always considered the weak point within your family, you secretly longed for a different life, perhaps as a girl. "Heh. Girls always have it easy..." you thought.
Suddenly, you bumped into an old lady, causing her to fall. She dropped her bag of groceries she had just bought. "Oh sorry, ma'am! I didn't see you, I'm really sorry." While picking up her groceries from the ground and putting them back in her bag, you mentioned, "Ah... sorry for your eggs, ma'am. They're broken now. I'll get new ones for you." "No no, it's not necessary, young man. It's okay. A day without eggs is fine." Nevertheless, you convinced her to come into the store and told her to wait there. You got new eggs and gave them to the woman. "Here are new eggs for you, ma'am." The old lady thanked you and went on her way home.
Later that evening, while you were sleeping, the old lady was thinking about you. She wanted to thank you with something and went through your thoughts from the moment you met. In them, she saw that you secretly desired the life of a girl. So, she used that information and cast a spell on you.