Multiple Shots Fired

I'm 42 straight male. Back when I was 15 or 16, I was dating this girl. She's had quite a bit of experience with guys, but she was only the second girl I was having sex with. She opened my eyes to sex. Prior to her all I had was plain vanilla missionary sex in the bedroom.
She gave me my first blowjob, taught me how to eat pussy. Rimming, anal, and my favourite, sex in public places.
My first time in public was in a gazebo in a public park. There were lights but not bright enough for our activity to be obvious. She never build up to it, she simply told me she wanted to go for a walk, and that she wanted to sit for a while in the gazebo. Then she started kissing me and making out, stroking me through my pants. She had a shirt on and when I put my hands under her skirt to finger her, I realised she wasn't wearing underwear. Which just make me even more excited. She whispered to me that she wanted to fuck me there, and proceeded to pull my cock out. I was so excited I thought I would cum there and then. She climbed over me and sat down on my cock.
And here's where it got embarrassing. I came right away, within 2 strokes. She had just made me so excited. We laughed it off and since I was still hard, she put my cock back in, and guess what, I came again in just a few strokes. This repeated itself and I came 11 times, prematurely, eact time only after 2-3 strokes. To the point, where I was cumming, but no sperm was coming out, I was spasming and convulsing but nothing was coming out. She was just giggling all the way at how I was cumming so quickly and so much. In the end i just ate her out and make her cum.
I'll never forget that first outdoor experience.