Snooping on my sister at the promenade

Hello, I'm introducing myself, my name is Dilan and I love voyeurism, I've done it many times and would like to tell you one of those stories. This happened when I was around 14-15 years old, back then I wanted to masturbate with whatever and spying on women really caught my attention. One day the family decided we'd go for a trip to some pools, everyone got ready and we went there. I have a sister who's the same age as me, she's super developed, incredible tits, I wanted to see them and suck them. We arrived at the pools and she didn't need to change because she was wearing her swimsuit under her clothes, clearly her tits showed up where everyone could see her. I spent the day and we had to leave so I went to change my wet clothes in the locker room, I was already naked when I heard my sister getting into the one next to mine, I could see her if I sat on a seat that was there and knew no one outside could see me because it was a pretty secluded spot. So intrigued by the morbidness, I got up and what I saw was precious, two big pointy tits due to the cold, without hesitation I started masturbating, it was my first time spying so I came in 10 seconds, just as I finished she realized I was spying on her and the very slutty sister didn't cover herself, she only asked me what I was doing there and I nervously replied that I was looking and got down quickly because of shame. I put all my clothes back on and when I turned around to look, I saw my sister's slut watching me, that really got my cock going so I asked her what she was doing and she responded the same thing you're doing and got down. Since that day I haven't been able to stop spying on her and clearly I have more stories with her but that's for another post, of course if you want me to tell you. I hope you enjoyed it