Nipples are already inverted after all this abusing-new/old pics

Decades ago I first saw a bizarre video of mature women who were ritually penetrating their nipples one another. One of them was older and her nipples were significantly inverted. She probably taught the younger one, who had only slight and tiny holes in the middle of her nipples. nI was absolutely turned on by what I saw and started experimenting with my nipples as well. First I used only normal needles and pins and pushed them deep inside my titflesh. It hurt and it was not any special sensation. Then I stopped with this and started again about 10 years later, that time with thicker tools. Not necessarily very deep in, but make wider holes. Last 20-25 years I do this regularly almost only with thick diameters. And last 2-3 years I gave up using sharp tip end tools and I use probes for sounding female cervix - 3 and 4 mm in a diameter. They had rounded end, but still can easily penetrate my nipples almost 2 centimeters deep, as they are permanently open now! My right one is much more inverted and can be penetrated even deeper and with thicker tool. nI mean more than 5 women did this to me during all those years as I asked them for this and all of them were always very curious and turned on by this activity and some of them even asked me to do this to them in turn, just to try. I was for sure happy to serve them this way. None of them unfortunately had naturally inverted nipples for me to make them even more inverted and also perhaps open, like mine are now after all those years...