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A few months after I got married I went camping with my wife's family. My father-in-law, who is a retired highway patrolman, is an avid fisherman and all around man's man. This story happens about three days into the trip. After a long day of fishing and hiking I excused myself to go take a long needed shower.
The campground shower stalls were large and made of wood. The dividers were high but came about two feet off the ground. After a few days of being deprived of the regular pussy I had grown used to as a newlywed I decided a good cock pounding was in order. With ample privacy and a goodly amount of lather I had no problem getting my seven inches to full mast.
I was just getting into it when I heard someone come into the men's room and start the shower next to me. I didn't think a thing of it and kept going at it. I could see the guy's feet and I could tell he was watching me through a crack in the partition. This really got me hot and decided to put on a show for him. I yanked on my balls and stroked for all it was worth and moaned. I was having a great time. Then the guy turned off his shower and came around to my stall.
I unlocked the door and in walked my father-in-law. Shit! I thought I was so fucking busted until I noticed his 8 inch uncut dick was hard. He walked in my stall and locked the door and began stroking his dick. We didn't speak we just beat our respective cocks. He started to grunt and then pulled back his foreskin and shot a monster load onto the floor. He then walked over to the shower stream, washed off and left without saying a word.
I was so fucking hot and my boner was begging for release. I shot the biggest load onto the floor right on top of his. We didn't speak of it at camp, but we did a repeat one more time before we left.
My father-in-law has become some sort of j/o buddy. When it's just him and me like when the girls are out shopping and we are watching football alone he will take out his dick and just start beating. That's my signal to join in. It's never discussed, just understood.