Well, when I was 19 I worked in a Garden Center. I had an affair with the owner's wife who was about 42. She had strawberry-blonde hair, 36DD breasts, and a nice full-figured bottom.
I was thrilled when I fucked her doggie style on the sales floor leaning on the front counter. We did bare. One day an older customer in her 60s snuck up on us. She peaked around a display, maybe 8 ft away. I didn't alert my lover.
The customer was only 8 ft away and had no problem seeing my mushroom head thrusting in and out of the owner's wife's wet and engorged pussy. She caught me staring at her and we smiled. She waited until I let loose and came deep in pussy. I had a thing for having my lover turn and take me into her mouth. She licked me clean. Our visitor smiled and walked out quietly.
She also gave me head in the back office every morning, jacking me off on her tits every now and then.
Not exactly the story you wanted. But, a story that I hope someone enjoyed. I think that woman imprinted on my soul at such a young age. I think I bonded with her for life. Big tits and ass drive me crazy.