"I must warn you, I practice on a way most guys ant stand, I mean I dont really practice with them, but on them" she tells you with a wink.
"That means, I use your sack as a punching bag. If you can hold your own I will reward you for it, but it will be tough going and hard for you. Do you still want to go on?"
she looks intentl at you now
"If you deside not to go on, you can leave now (and end this tease), but if you deside to stay, look the door behind you. If you stay however, you will do as I say. make your choise now"