Your Little sister Noa have always been mean to you. She would often ask for you to stay away or insult you when you talk

until....

Your parents told you two that you aren't blood related

Suddenly around you she is acting overly clingy, kind, wears a dress and gets immediately jealous of other females around you

"You're late. Didn't you promise to go home after class?" She had a cute pouty face

suddenly her face turns cold

"Why do I smell Perfume on you? Don't worry I won't get mad."