[Like me, all of the people appearing in my stories are over the age of 18]
I wish I had an incredible story to tell. Well, not true. I DO have what I think is a pretty incredible story. I just don't have any kind of incredible build up to it. There was no spiraling erotic tension between the two of us, nothing like years of unsatisfied longing, no weird case of mistaken identity or drunken encounter. All that being true, my sister Hannah and I fucked for the first time last Tuesday, and for the eleventh time yesterday.
We usually get together every couple of weeks, have dinner together and catch up. If we're in relationships, we may even let them tag along. Sometimes we go out, sometimes we stay in. Sometimes it's on the weekend, and others a welcome escape from a long workday.
On the aforementioned Tuesday, at my place, we were playfully arguing throughout dinner about what the toughest team sport was, bouncing around from football to soccer to basketball to rugby. We were talking about what protection each had, and while we were standing next to the table clearing it, she slapped me on the shoulder playfully, and said "You just wish you were tough enough for these sports anyway." That descended into us playfully swatting each other on the arms, shoulders, cheeks, butt, etc. I'll admit I was already getting a little turned on. I like strong, physical sex and women who don't mind asserting themselves with me, women like my sister, actually.
We'd swat at each other, grapple a little, then back off and swat at each other more, then back to the grappling. Before long, I had a raging hard-on that I knew I'd be taking care of after she went home. I swatted toward her shoulder and accidentally grazed her breast, and she got a wild look in her eye and said "Oh, no -- you didn't just ...! It's on!" and then pounced on me. I got a good grip on her wrists, so she was left trying to knee me -- not too hard, of course -- and as she was doing that, with her thigh probing between mine, she realized that she wasn't just feeling thigh up against her skin, but something much harder, and she later said, surprisingly large.
"Ohmygod, you fucking perv! You are hard as a rock! Are you getting off on wrestling with your own sister!?" She was laughing as she said it, so clearly, she wasn't freaked out. I said "No, of course not" and then we went back and forth with things like "Yeah, right, I can feel it with my leg, dumbass." And she'd grind it against my cock, while I denied it. I claimed it was my wallet or something. Finally she wrenched a wrist out of my grip, and grabbed at my crotch, latching on to my hard cock through my jeans. "Alright, perv, then tell me what this is!"
Then she realized what she was doing. Her eyes got big and her face looked very surprised at what her hand had gotten her into. She changed her grip a couple of times, then added, "Ohmygod, how do you walk around with that monster? I've never noticed you limping before. " That was an exaggeration, of course. It's no horse cock. Maybe on the high side of average, but not enormous.
She didn't show any sign of letting go, though, so I took both of her breasts in my hands, and started to squeeze lightly, saying "Two can play at this game, baby sis. Who's going to blink first?" That did not help my erection go away, not in the least. I'm the one who sealed the deal when I started caressing her nipples with my thumbs. Up to that point, we were just play fighting. I caressed and she stroked, and we both got a little glazed over. Then I took the back of her neck in my hand, fingers running through her hair, and pulled her hard to me and kissed like I meant it, like a hot and playful woman had my cock in her hands, in fact.