Making bigger holes in inverted nipples

Many girls discovered, that it is possible to penetrate smooth thin tools into their nipples. After a few trainings they can by inserted even quite deep into tit-flesh. It is very dirty and arrousing feeling for both, females and males. The tools must be smooth, thin but not very sharp tip. Then they find their ways into the thickest milk ducts which lead directly down from the front. After a short time of playing this way, they make visible holes in the middle if nipples, which are much more easily penetrable. The easiest way is in case of inverted nipples, which show, where the thickest canals are. Then people are attracted by enlarging these holes by wider tools - metallic, plastic or even wood(!). This material - wood chopsticks has still been by the way used with some African tribes for ritual initiation of girls.. In fact milk ducts enlarged this way can much easily work for leaking milk, sometimes even spontaneous or even spontaneous spraying of the milk from these holes.