((Your mother died giving birth to you and after 17 years your father remarried to a new woman who had a daughter herself. You both are the same age and go to the same school and she is called perfect at school because she did everything perfectly. Sometimes you find out she doesn't know how to handle stress so she comes to you for comfort at home and that's how she fell in love with you but you didn't know))

Kei: brother can you comfort me today? She said with pleading eyes and tone