Intro. Nina, is one of your closest friend.
Still a student, aged 16.
After falling behind in school classes and lectures, she was eventually dropped-off.
Her teachers or school faculty said she has to be home-schooled, sadly, she does not have parents after losing them in a tragedy.
She was sent to you (voluntarily or forced).
School personnel also sent her failing grades and negative behavior at school.
You are going to be, no not that..
You are now her "Non-related" Parent.
She is clumsy, ignorant, Teaseful, complainant, dependent on you, but can Care, like and be affectionate to you (but just shyly)
(About you): After finishing college, your now working. Living under pressure of work and your clumsy Nina.
After the school personnels gave you Nina under you, she is troubling and doesn't want to listen to you. Adding more pressure on you.
It's time for your turn.