Two 13-Year-Olds

It started when my sister and I were 13 years old. We're fraternal twins, so we don't look alike, other than that we both have a kind of darker blond hair, as you can see. At the time, I wore my hair long, to my shoulders, so we did perhaps look more alike then. As brothers and sisters will do, we got to playing doctor at one point, and I wanted to examine her pussy. She actually let me, as long as she could examine my dick. So, she pulled off all her clothes, and I took a good, long look. I lightly pinched what I later found out was her clit, and she seemed to particularly like that. It wasn't 'till maybe a year later that we figured out how to give her an actual orgasm with her clit. But at the time, I was particularly fascinated with where the pee comes out of her, and so I did my best to figure that out. With that too, I wasn't able to manage to see her actual peehole until later. One time, I had her pee in the back yard while I stretched her vagina open, and saw the actual peehole in action. But, I'm getting ahead of myself. So, playing doctor at 13, I was able to examine her in detail. She hadn't grown breasts yet, but I was able to see her pussy and even her asshole in great detail. I've always enjoyed looking at assholes. I don't know why, I just do. I loved it that first time, and of course I grew a little, hairless, 13-year-old erection while examining her. Now, she wanted to look at me, and I was embarrassed for some reason. I didn't want her to see my erection. Now, I can't imagine why that was then, because I'm always proud of my erection these days. But that's the way it was, and so I started expressing my reluctance to pull down my shorts. She got kind of mad, and reached over to pull my shorts down. We tussled a bit, laughing the whole time, and finally, with a little assistance from me, actually, she got them down around my ankles, and then removed them entirely. And there I was with my skinny white four-inch penis fully hard, waving in the breeze. She was fascinated. Beyond fascinated. She reached out to gingerly touch it. It was the first time anyone touched me there, and soon I started feeling some sort of contractions as she was instinctively moving the skin of my shaft up and down, alternately covering and uncovering the tip of my dick. I do believe that was my first-ever orgasm although nothing squirted out. I didn't know what it was at the time. It kind of freaked me out, but I also had an idea right away that a wonderful new world had just opened up for me. She wasn't done yet. She started fondling my balls. Now, you'd think, after just having an orgasm, such as it was, I'd be done. But no, I was in heaven! She seemed to want to know more about my testicles, and was kind of squishing them around within the scrotum, trying to identify their actual shape and texture. Meanwhile, my penis went soft, and so she lifted it up to understand it in its deflated state. That touching caused it to become erect again. Then she returned to my balls. She was squishing them around, kind of pinching them as she discovered how they slip around in my scrotum from side to side under the pressure. She was learning to squeeze harder, so the balls would occasionally pop out from under her thumbs. It hurt a bit, and she laughed, but did not quit doing it. It hurt, but in a good way, which caused my little penis to become very hard indeed. She kept it up, and now it was hurting more. I was squirming and threatening to get up and stop playing this game, but she turned around, sat on my chest, and resumed her squeezing of my balls. Her little, pink, puckered 13-year-old asshole was right in front of my eyes as she sat on me, leaning forward. What a picture! And I could smell its sweetness also. I lightly touched her butthole with one finger, which caused her to say "yum!" Suddenly, as she continued to squish my balls just a bit too painfully, one shifted into a different position, and it hurt tremendously for a split second. That caused an unexpected reaction: I had that contracting feeling again. After that, I was done. My mood had shifted. I told her so, and being the good sister she is, she did quit squeezing my balls. As you can imagine, we played many times after. She found my peehole intriguing and wanted to stick pens, Popsicle sticks and other such things in it. I didn't much care for that, since it would sting when I'd pee later on, but it seemed to make her happy. She continued with the ball squeezing business every time we played, and I learned to love it. In fact, it became a fetish. To this day, I ask my wife to squeeze my balls whenever we make love. Just like my sister, she seems to enjoy giving me that delightful treatment. As to my sister: We have both grown into adults, are married and have families of my own. My wife knows all about what my sister and I did. When I first reluctantly told her about it, she got all sorts of horny, and we had to fuck right then and there. She also knows that my sister and I still play from time to time. In fact, all three of us have been in bed together. We love playing with each others' 'things.' Both of the women will massage my balls at the same time, one on each testicle, and I'm in heaven. Then, they'll turn their attention to each other, rubbing and licking each others' pussies. At that point, I generally stroke myself, and have a great cum watching my beloved wife and sister play.