There's other threads about this. I was able to when younger. First time was 14 years old. Long story short, I came in my mouth by accident!
It was actually the first time I ever came at all outside of wet dreams. Scared the hell out of me and I spit it into the toilet. It did raise curiosity in me so the next time I was alone I tried again. At some point I just came and swallowed it. I could get the head and part of the shaft in with some stretching.
Got to where I enjoyed cumming in my mouth and even a few times on my face.
I tried a few years ago and could lick the head. Look through my pictures and you'll see. Maybe the link below will work.