Catching Grandpa Cheat

It was July 4, 1976. My grandfather picked us up from a parade in his big station wagon. There were 10 of us kids packed in the car, no seat belts of course. At 8 years old, I was one of the older of the bunch. Grandpa was grumbling about having to come get us when he just wanted to be at the barbecue drinking. He pulled In quickly to a gas station close to the house. He said we could all pick out two pieces of candy, and to wait by the car. At the time, I noticed how pretty the girl behind the counter was, and how big her boobs were (I was developing and obsessed with boobs and getting big boobs). They were F or G cup big, and they sagged her American flag tube top. After 10 minutes my cousin and I decided to go check, but the little store was locked. I guess we were looking for a back door? I don’t know why we went around behind the building. But we rounded the corner and there they were. She was bent over this big oil drum thing, holding on to it, her tube top pulled down, her big boobs were going back and forth, her shorts were pulled down, and our grandpa was behind her, pants open, belt clanging as he thrust in to her. I had never seen anything like that before and was shocked. My cousin had walked in on his mom many times and just yanked me back, covered my mouth and put a finger to his lips like keep the fuck quiet! We just walked back to the car and waited.