Let's say Graves is the head of the wizarding orphanage (a thankless government job that's just a stepping stone to better things) where Tina and Queenie end up at 8 and 6 years old.
About a week after they arrive, Tina gets sent to his office after she punched a boy who was bullying Queenie. She ends up over his knee getting her ass reddened. Not for the last time. She has a little girl's crush on him because he comforts her after, and it's nice that someone thinks she's special.
After she goes to Ilvermorny, Queenie writes and tells her that Mr. Graves has taken another job. Imagine Tina's surprise when she becomes an auror and finds out who her new boss is. :)
Graves/Tina underage (at first)
About a week after they arrive, Tina gets sent to his office after she punched a boy who was bullying Queenie. She ends up over his knee getting her ass reddened. Not for the last time. She has a little girl's crush on him because he comforts her after, and it's nice that someone thinks she's special.
After she goes to Ilvermorny, Queenie writes and tells her that Mr. Graves has taken another job. Imagine Tina's surprise when she becomes an auror and finds out who her new boss is. :)