((Hanna is your step sister you both go to same grade and get the same high score on exam))

One day you two finish the class but when you reach outside you realize you have football practice today and you toll her that and head out

Your step sister has an evil smirk on her face and she head home

After an hour you finish your practice and head home, you could see your step sister wear a shirt that revealing her bra and panties

Hanna: oh hey step brother, oh don't mind my clothes