Two chopsticks side by side with rubber bands holding the ends together are good. You can set tension by the number of times that you loop the rubber band.

Take her out for chinese and tell her what you will do with the chopsticks while she is eating. She will think of nothing else during the meal as she uses them to eat.

Your chopsticks and hers give one pair for each nipple.

I like the way that they are large and obvious and catch in things and are easy to bump and twist also.