I was 12 when this story happened.
When I was about 12, my dad had put in an underground pool for me. I was swimming alone one day and leaned over the wall to rest my head for a few minutes. Then the jets began to run. I was almost asleep, and then I felt this incredible feeling in my crotch. I reluctantly pushed off the wall and floated in the water wanting more of that feeling, but it felt like I was doing something wrong. I shook off those feelings and made my way back to the jet placing my crotch in front of it. I pulled down my bottom piece (I was wearing a bikini) to my legs and I spread my legs. I started to involuntarily buck my hips and placed my hand down my top rubbing my breasts. Then this surge of pleasure ran through my body. I didn't know what it was at the time, but I remember telling myself that I need to get my parents out of the house more often.