If you want to really test the mettle of your sub, spend an hour or two getting her worked up, pamper her, give her a sensual massage, plenty of oil and then move your hand to her cunt and start doing this…
Tell her that if she moves a muscle you won’t touch her for another week… and she’s not to touch herself either, but she will be wearing ben wa balls and tight panties/jeans for the entire week.
If she manages to last longer than 10 minutes I’d be very impressed… of course it is up to your discretion whether you allow begging and how effective said begging might be. Have fun folks 😉
