A bit of context, I was eighteen. I knew what sex was, of course. We joked about it with friends, I'd seen a few things online, but at that time it all felt distant and abstract. That summer, for one of my last all paid vacations with my parents, we went to see friends that have a house in the south. We know this family for a long time and their two girls and boy was almost my age, just a bit older.
And that last day, our families were eating on the terrace of the house near the pool while I was with their child on the deck chairs. After a moment, it was so hot that I just decided to stay in the fresh pool, so I slipped into it and leaned against the edge, still talking to others.
I have this odd habit of always needing to play with something in my hands while talking. So, while I was in the pool, I started playing with the powerful water jet, it created a current that made my hand float in front of me, like when you hold your hand out of a car window. The sensation was pleasant, and I began having fun moving around in front of the jet. I was in the shallow end, about 1.5 meters deep, so it was easy to shift around and let the stream massage my stomach, arms, and other parts of my body.
The jet ended up splashing the bottom of my blue two-piece swimsuit passing just a few centimeters above my clitoris...
At first, I just thought, "Hey, that feels nice in that area, I'll just keep going a little longer." So I sat back down in front of the jet and gradually raised my hips, so that the jet was aimed directly at my clitoris, and I found the sensation really pleasant. But again, for me it wasn't really sexual, it was just pleasant, and I decided I was going to stay like that for a while.
While I was talking and laughing with my friends and family I was in front of the jet, letting it massage my clitoris. After a few minutes, I felt something new building, a heat rose from my pussy and spread throughout my lower body. It was so new to me that I immediately moved away to catch my breath. From that moment on, I talked and laughed less and less with the others. I touched my clit under my swimsuit and felt it swelled a bit. I was a little scared, but the sensation began to fade and I wanted more.
So I stood back in front of the jet, clinging to the edge of the pool and presenting my pussy to the wonderfully pleasant stream. While people talked to me, seeing only the upper half of my body, I smiled politely as my hips arched under the water so that the jet would run over my clit and then over the top of my pussy.
I think I stayed like that, letting the jet masturbate me for a good ten minutes, pulling away every time the sensation became too strong, each time going a little further, wondering how far this sensation could go. Each time I was a little more out of breath, I had to start holding back my moans. My heart was beating so hard, I couldn't stay in front of the jet for very long, the sensation overwhelmed me too quickly, so my pussy contracted on its own in my swimsuit while I waited to get back in front of the jet.
I couldn't take it anymore, the sensation was preventing me from thinking straight, I just wanted more, I wasn't talking to anyone else anymore, all I could think about was jerking off with that jet, and finally I went too far... I pulled out too late and was hit with a huge orgasm, which made me put my hand over my mouth to hide my face contorted by this explosion of pleasure. My ass and thighs convulsed under the waves of pleasure, my legs would surely have given way if I hadn't been carried by the water...
There I was, in front of my family and friends, losing my mind as I had this huge orgasm that made me almost unconscious. I don't know how, by some miracle, no one noticed or dared to say anything. Anyway, I was able to catch my breath for few minutes and recover before getting out of the pool.
That first orgasm was a revelation for me, and it really marked the beginning of my sex life. It was after that experience that I started masturbating regularly and looking for sexual partners.