I had a paper route
I delivered papers too in the wee hours of the morning. When I had to drop off the papers at apartment complexes, some customers had their flip-flops outside their door. Being that I have a foot fetish too, at times, I couldn't resist. I would find a secuded spot, pull out my cock and jack off, sniffing one sandal while shooting my load onto the other, making sure to aim it at where their toes or heel would be. I thought about leaving it there and imagine that they would step onto it next time they slipped their foot into the shoe, but then they would probably know and/or not leave their shoes out anymore. So I would clean it off. I would rub the jizz around as I was wiping it off. Sometimes if the sole was really dirty (those often have the best foot smell too), my cum would make them somewhat clean again. So even if the cum didn't stay there, they still, in a way, were stepping on my cum. And knowing that turned me on.