The erotic massaging of the taint with one finger in the butt and a thumb in the snatch, checking to see if that taint will get all swollen or if that taint will get all thin-skinned while being caressed.
So much fun to tease her g-spot with the knuckle of your thumb while her taint is getting handledproperly by the modified ray-ray shocker.
Me: My nephew is going to college at W&J!
My bro (who graduated from W&J): The best part of freshman year at W&J is getting your first W&J shocker from your roommate!