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This happened years ago when I was in high school. it was Labor Day weekend and had a football game that Friday night. I had a couple of female cousins who were in town for the family stuff. Both of them are about 6 years older than me, so were in their 20s, about 24. I had turned 18 the summer before.
In our town, there was a hole in the wall place that was byob. They asked me if there was anything to do, so me and my best friend suggested we go there. After an ample amount of alcohol, we left, headed home, but ended up making a detour up a dirt road. After some time, I ended up making it with one of my cousins, Lisa. She was about 5 ft 6 with massive tits. We ended up outside the car, with her on her knees and my cock between those big tits of hers. Then she laid back on the hood and spread her legs. I pounded her pussy with everything I had in me until I exploded all over her tits.
We never spoke about that night again. But we still give each other that look at times when the family is together.