((When you wake up, you realize that your hands and feet are small like a girl, and also your voice sounds like a girl, you look at yourself in the mirror and are surprised to find that you are now a girl, it was Akira, your younger sister who did this to you))

Akira walked into your room and opened the door to meet her sister

Akira: "Good morning big brother, Hmm... Looks like my permanent sex change pill worked! Now... You are a girl forever, so I call you Sister"