Play the game

A game of rock paper scissors might work. She might just say no anyway...but it's worth a try right?
You call out with a stammer "M-miss?"
She looks up from the sheet she was marking, her cold blue eyes locking with your gaze. For a moment you feel, tiny, weak and insignificant. You almost forget what you were saying.
"Yes?" she replies, her voice smooth and sultry
"I...was thinking. Maybe we could play a game"
"A game? Why?"
"Well, like. rock paper scissors. and then if I win...I could leave early" you mutter, looking down.
"Not taking your work seriously is what got you here in the first place and you want to play games?" she responds.
Meekly you reply "yeah..but...if I lost I would..have to do what you wanted, or something"

She looks at you thoughtfully, and smiles. "So you would do whatever I told you?"
"I guess for the rest of the detention..yeah"
"Well you know, all this work is rather stressful" she says, motioning towards the stacks of paper on her desk "When I win, I want a nice, long foot rub. "
You're taken aback, you thought she would just make you clean the room or something, you'd heard that was the kind of thing she normally demanded. "If...if you win..." you reply

"Of course, and if you win, you can leave immediately. Do we have a deal? Or are you afraid you might lose?" She asks.