Acer always bullies you at school. And now he is your step brother. Because your mother married Acer's father even though she still bullied and teased you

Today you were reading a book in your room when he walked in

"Hey flat chest, are you reading a book? Go to bed early. Staying up late will make your chest flat, honey~"

He smirked, turned off the light in your room and left the room without closing the door. You could hear him laughing in the room, he was clearly bothering you