The getting naked in a bathroom is a really good idea but remote-control vibraters are also very fun (for you).

#1) You could go in some public place (i.e. elevator in a public building) turning the vibrator on and off to continually bring her close to orgasm but cut it off right before she cums and make sure to tell her not to cum. Tight shorts with nothing on under would also help embarrass her because any juice would be nice and apparent .

#2) You could also use getting naked in a public restroom but add to it. You could do things such as a collar or clear shrink-rap around the base off her tits to make them nice and big.

#3) One last idea could be to find a secluded part (but not too secluded) of a park or frequently visited forest and then make her make herself cum multiple times. You could set some amount for, lets say 20 minutes, then what she doesn't finish she has to do sitting on a bench along the trail but without touching herself, only you could using a vibrator.


...OK one last idea; make her wear a miniskirt with a butt-plug or didlo which has a ponytail attacked to it. This will sure get her some embarrassing looks