My best friend Mike was over for the weekend and we must have been getting low on the list of regular things to do. My sister (one year younger) was also looking for something to do and the three of us decided to play some cards in my bedroom.
After a few rounds of cards with normal stakes, Mike and I suggested we play strip poker. To our surprise, my sister agreed. I hadn't seen her totally nude for quite some time, so I was almost as excited as Mike was.
We played until all three of us were naked, genitals on the carpet as we sat around cross-legged, my sister's generous breasts only a couple of feet away from us guys.
We put our clothes on, played a second time, and once we were all naked again, my sister decided that was enough fun and left. That left Mike and I sitting naked with semi-hard cocks kind of savoring the amazing experience of having my sister's naked body so near and open to us.
We talked a bit, but the conversation stayed salty enough to keep us hard and we didn't bother to put clothes back on. Eventually we were kind of playing with our dicks while talking and we both got hard and excited. What happened next was inevitable. We started to jack off. Our techniques were pretty similar, but enough difference to make it that much more interesting.
I watched him and he watched me and it was over in a very short time, with loads of cum on our hands and on the carpet. We cleaned up, got dressed, and came up with something new to occupy our time. We never did it again or even talked about it, but not because it was weird, it just didn't happen again.