Having a severe disability from birth, I am extremely limited in what I have done. In my case (ymmv), during my mid-teens, I was kissed by a grand total of three girls. All three were quite intense, which was amazing (one left me shaking), but I have never traded tongue, as it were. I'd love to experience a sloppy, suctiony, tongue kiss with a pretty girl (or a few), with her taking charge of it.
My earliest fetish, a medfet, is to see a girl having to wear a mask on her mouth and nose. In 2006, when I was 30, I befriended a 19 year old girl on an art website who was in that situation (cystic fibrosis leading to a transplant). She also modelled, to take care of medical expenses. We eventually got to meet in person at a fundraiser in her hometown. At first she was wearing one of those cloth earloop masks that got to be popular during the pandemic. It was white with a lace pattern. It was such a massive turn-on to see her masked and hear her muffled speech. And by that time, she knew it was a fetish of mine, because I commissioned some modeling art from her.
At some point, she switched out of that mask and started wearing a half mask cartridge respirator, such as you'd use for spray painting. This one was matte black silicone, with one big white circular filter on each side. One wide black "halo strap" on top and a normal strap on the bottom.
So, one fantasy I have about her (or any pretty girl), is to be able to take the big half-mask in my hand and look at the inside of it and feel the edge with my fingers. All the while, she leans over and kisses me with full suction and then full tongue. Lots of her saliva. After maybe a good hour, she stops the kissing and takes my erect penis into her mouth and uses a combination of a tight, wet tongue swirl and just deepthroating. I fantasize about her gagging or worse.
Once all that is done, she gets into her mask (sometimes it's the cloth mask and sometimes the huge respirator) and facesits me through 2 or hree orgasms.
I have a lot of clothing fetishes, so she (or even a group of girls) dress in that kind of fetish attire, including ballet classwear (tights, leo and pink or black slippers [non-pointe or character shoes]; or a footed blanket sleeper, or white soccer socks and black soccer cleats.
In any instance, she would have a very tight stomach. Normally she'd be caucasian (with dirty or platinum blonde hair and well bronzed) but occasionally Asian or Mexican.