There's a whole ton to digest here, and my response will likely only get at it somewhat (bad reading comp).
I am 44 now, and was operated on a lot when I was growing up (16 times from ages 0-16, including my 15th and 16th surgeries, which came within a week of eachother. The latter was on an emergency basis). I usually only ever spent a week in the hospital, but recovery was usually extremely painful, as most of the surgeries were on the leg muscles or the spinal cord (I haver spina bifida, if you want to look that up). And, like I said, my 15th surgery came with complications. It was for spinal tethering, and I suffered a CSF (cerebrospinal fluid) leak as I was getting staples taken out, so an emergency 16th surgery was scheduled for the next day.
My mask fetish only applies to seeing a girl have to wear one. Not to wearing one myself. But it did start with anesthesia masks before veering into N95's, cartridge respirators (half mask only) and surgical masks. So I have definitely felt the black beauty on my face before, but for whatever reason, I was never excited by that. And in today's Covid-19 era, I'm actually hating wearing the earloop surgical masks I have on hand. But in neither case am I traumatized by the mask.
I will say that, as I have mentioned ad nauseam, I had an attractive female teenage friend who wore a cartridge respirator for her immune system around the time she had a lung transplant. It was an amazing sight that first time I met her in person. 5ft6 thin brunette in a dress and boots, masked up in a matte black, half mask cartridge respirator, that was held tightly on her mouth and nose by a thick black strap harness on top, and another black strap below her ears, with tabs on the sides to adjust. It was a mindblowing fetish moment. But now I'm left wondering how a half mask cartridge respirator feels to wear, versus the earloop masks I wear for Covid-19. Maybe they're a lot more comfortable. I don't know. All I know is I'm not aware of any stares (a big complaint of patients who need to be masked up).
Zity has helped me establish those roots of my fetish, even though my particular one, for masked female patients (not nurses, not doctors), is pretty rare around here. I think I'm just comforted by the existence of this umbrella, "medfet", a word that explains it all for me.