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There are clubs where these things are allowed - make her perform for you in front of others. let them touch her but not in her most intimate places as you don't want her to pick up a disease.
Have the remote control vibrator in and let people take turns controlling it while she pleases you.
Q: is this to be a punishment to keep her in line, or other reasons for the public thing?
unfortunatley, all the best public humiliation methods are illegal. I knew a dom who made his sub take off her shirt while driving so that other drivers could see. That could get her a charge of indecent exposure. (actually, in TX it is legal for a woman to go topless, but if it creates a disturbance there is a charge for that).
So you may check the laws where you live, and maybe you can make her do that in a location unlikely to cause a disturbance.
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