In my senior year in high school me and four of my buddies went on a weekend trip to a logging camp in the Maine woods. To get there required a two hour drive in from the coast, then a one hour canoe trip up river to the camp on forest land leased for 99 years from a paper company by one of my friend's parents.
The camp was rustic and contained three bunk beds, so we each had our own sleeping space. The sixth bunk was the storage area for backpacks. The first night it was pretty cold, so we didn't spend too much time after getting there before we climbed fully dressed into sleeping bags and called it a day.
The next morning three of my buddies went hunting. Me and another friend, Dan, stayed behind. Neither of us hunted and had come along for the nature and to hang out as a group. I like being in the outdoors, so I left about an hour after the others went hunting to walk along the river, sit and read, write poetry, and enjoy the day which warmed up nicely once the sun came up.
Dan stayed behind to read and relax. When I left he wanted to know how long I'd be gone so he could plan lunch (Dan was our food guy and cook on the trip). I told him I'd be back in three or more hours probably.
After being out about two hours, I headed back to the camp. As I got closer I thought I might try to scare Dan by coming around the back of the camp and rubbing a branch along the back wall to make him think a bear was out there. As I came closer to the camp, I saw Dan standing facing in the opposite direction obviously taking a leak. I waited for him to finish and was surprised when he shook himself off and then turned around with his penis hanging out of his jeans. He headed towards the camp without zipping up and went inside.
I had seen Dan naked in the shower room at school before but for some reason seeing his wang hanging out today got me horny. I crept up on the camp and edged around to look in the side window. Dan was back to me and going through his pack on the sixth bunk. He pulled out a magazine and stood looking at it. He then put the magazine down on the bunk and I was surprised and yet pleased when he undid his pants and pushed them down to his ankles. I now had a view of his bare ass as he bent over to get the magazine again. He held it with one hand as he began making the tell tale motions of jerking off with the other.
My own cock was now erect in my jeans. I watched Dan as he walked over to his bunk and laid on his back. With the magazine held up in the air, I got my first look at his erection. It wasn't anything impressive in size, but the milking motions he was making had me undoing my own pants in no time. As Dan's hand fisted and caressed his cock, I mirrored his actions with my own hand and penis. I felt more aroused than I had in a long time and quickly shot my load on the side of the camp. As I released I looked up to see Dan throw the magazine down and using both hands bring himself off. I then backed away from the window, fixed my clothes, and went back out into the woods for a bit. I didn't want Dan to know that I had seen him; I hoped that maybe tomorrow I could get another show.