Step-Sister in Swimsuit 2

As Ive said in my previous story, I was on the swim team in my teen years and would attend meets at my local pool regularly. My mother and stepfather were among the few parents who stayed to watch their kids during the meets. My stepfather has a daughter named Caitlyn who is now my stepsister. This story takes places about a month after the first. My parents were still many months from marrying, but our families had become quite close so I already considered Caitlyn a sister to me. The swim meets were on break for two months, which disappointed me as I rather enjoyed going weekly to them to see all the boys and girls in their tight team swimsuits. Despite this, Caitlyn and I still went to the pool every couple of days during the break period. We would always follow a similar routine: after getting changed we would swim in the 25m indoor pool (which had cool water) for about half an hour, then go relax in the indoor heated pool for the next half hour before finally going outside to the 50m outdoor pool for an hour. Sometimes we would race each other and other times we would just relax- floating carefree and splashing each other with water. I enjoyed watching Caitlyn in her tight blue one-piece, and Im sure she enjoyed looking at me in my blue speedos as well (we wore our team swimsuits). At 15 and 13, we were going through puberty and I noticed Caitlyns breasts were growing, which looked great being compressed by her swimsuit. She had also grown taller, meaning more of her hips were showing and her pussy could be seen more clearly in her one-piece. From our previous masturbation sessions I knew that Caitlyn was beginning to grow some pubic hair above her vagina, but at this point it was just a tiny patch. On one visit to the pool, a new family change room had been opened. We had noticed it being constructed in the past few weeks and were excited for the opening as we could now change together in the same place! The new building consisted of several smaller stalls which could fit a family of four. Each of these stalls had benches and two showers, closed off from the other stalls. The first time we went in to the family change room was uneventful. All Caitlyn and I did was take of our clothes to reveal the swimsuits we already had on, so I didn't get to see her nude or anything. When our pool session was over, however, the real fun began! We entered the family change room stall and Caitlyn said she had to pee, and turned to go to the separate toilet area. I grabbed her arm and said well, just do it here under the shower. She agreed and went to stand under the showers and let a small stream of pee pass through her swimsuit. I began staring at her crotch and the wetness of the water from the pool and her pee was making the swimsuit see-through, clearly showing her pussy through the nylon fabric. On instinct, I reached out with my right hand and touched her pussy while she was peeing. Caitlyn let out a soft moan and her urination flow became much faster. When she was done, I lifted my pee-stained hand up and smelt it. I told her it smells great, Cait! which got Caitlyn giggling. I decided to pee as well and pulled my speedos down to my ankles. I had a raging hard-on so it wasnt easy, but I started to pee and aim my stream towards Caitlyns pussy. My pee stream hit her swimsuit and made a soft chhh sound. Caitlyn told me it felt great so I kept going until my bladder was empty. When we finished, we took off our swimsuits and started to shower. Both of us were excited to see each other naked with steaming warm water flowing over us. I loved these new family change rooms! Caitlyn looked amazing in all her naked glory. Her wet hair made her look smokin hot and the water droplets over her breasts and pussy were just the icing on the cake. My penis had grown a bit too so Im sure Caitlyn was happy staring at me as well. When we finished showering, Caitlyn gave me a sexy look which of course meant its time to masturbate. We sat down on a bench next to each other- me on the left, Caitlyn on the right. I reached over with my left hand to stroke her small budding breasts and wrapped my right hand around her back and over her right leg to finger her pussy. I like to swipe at her pussy a few times from butt to pubic hair before jamming a finger in and using my thumb to play with her clit (and repeat this a few times). Caitlyn used both hands to fondle with my balls and stroke my penis, occasionally touching my sensitive glans with her fingers. She did that to me for a few minutes until I finally came: five or sex long ropes of cum shot out and landed on my chest and Caitlyns arm. Of course, guys have to wait a while before jerking off again but girls can enjoy multiple orgasms in a row (lucky them!). I continued my masturbation technique with Caitlyn for about half an hour, leading her to multiple sexy orgasms where she moaned and groaned a lot. When it was all over, we just sat there and admired each others naked bodies. Suddenly but slowly, Caitlyns faced moved slowly towards mine and she started kissing me on the lips for a long time. As we shared a passionate kiss, I began to wonder how our relationship would develop from here