On a 7-9, she does it if you turn her on.

"Miss Mitchell."

You step up right in front of Julia, looking down at her from your notable height advantage.

"You needn't worry about the other teachers. I will explain everything to them to their satisfaction."

You stroke her cheek with the back of your hand, then let your fingers stray down to her chest and slip your hand inside her school jacket, making sure to keep her body between you and anyone who might look your way.

"As I'm sure you've become aware, this school isn't like every other. When a teacher makes a request of you, you may find that meeting such a request can be a rather pleasant experience.

You lightly fondle Julia's breast, rubbing your thumb against her rapidly stiffening nipple.

"Have I made myself clear?"

Julia is blushing furiously, her lips slightly parted.

"Y-yes, Miss Stevenson."

"So you will come?"

You smile at her and she blushes again, whether at your intimate touch or the double entendre or both you can't tell.

"Y-y-yes, Miss Stevenson."

"That's a good girl."

You withdraw your hand and walk back to the empty classroom, Julia following at your heels. You show her in and close the door behind you.