The time I [M] fucked a customer [F] at the beach after selling her a car

How I(m) came to fuck a customer(f) at the lake

This is my first time posting here, so any feedback is welcome.
Also English is not my first language so grammatical errors are possible.

I work as a sales person at a BMW dealership in Germany, my department is used cars.
I am now 29, blonde and it is visible that my job involves a desk and not a treadmill.
I am 1,87cm and weigh around 110kg in form of a dad bod.

The story took place in the summer of 2018, when the times were still normal.

It was a regular day at work, me sweating my ass of in my office without AC, some customers strolling around on the lot, most of them just strolling around in the heat, nothing to serious.
But then something caught my eye, two girls and a guy, the one girl with her long hair dyed bright red, wearing a white dress.
They were looking at one car for some time, indicating that they were interested in it, so I walked over and greeted them.
I noticed that the girls were both a few years younger than me, early twenties, the guy was older, late 30s early 40s.
All three of them were super chill and it turns out the guy is the older brother of the red haired girl, the second, blonde girl is a friend of hers.
The red head is looking to buy a new used car, her brother is a mechanic offering advice and the friend is there for moral support.
All three of them are very relaxed and in a matter of minutes we all get along great.