Ok, I rarely use electrical devices. I think part of the charm of doing it and showing them to you is that it is very visual. But believe me, I also have fun but in private with some electrical touches.
Was there such a nail plate under the second breast?
But that brings me to an idea, with a little gimmick you could also connect the nails of the nail plates to an electric massage device. This would definitely increase the charm and pleasure if you do the left and right.