Tom and I are very good friends, Tom lives near a very big lake and I go on vacation to his house every few months.
Because it was a hot day, we both decided to go to the lake where we always go to swim. So we walked to our spot. It's like a beach, but in the middle of the woods. After almost thirty minutes we arrived at our spot.
We both opened our bags, but then I realised I forgot my swimgear. I told Tom, he said he has two towels, normally one for sitting on and one for drying. I asked him if he packed two swimming pants, he joked he did and said 'doh' after it.
Tom got undressed behind a tree and put on his swimming gear. I told him I really forgot mine, he told me to swim in my boxers, a really good idea. I undressed and jumped into the water, like kids we both started to playfully drown each other.
After a while I noticed my boxers were gone, I lost them drowning Tom. We both got back onto the shore and I was completely undressed and Tom had still got his swimpants on. He laughed because I was missing my boxers, but to make it fair he took off his swimming pants.
We both lay naked on the grass in the sun. After a while I noticed him looking at my naked body, having a boner. He saw me looking and told me if I ever wanked. I told him I've never done it, because I didn't know what he meant. He rolled over to me and started to touch my penis. It began to get hard. Tom started stroking me up and down. I asked him what he was doing and he told me to 'relax' and do back the favor, so I did.
After five minutes or so, I started to get a funny feeling and I got a sparkle through my whole body. My friend began to breathe heavy and moaned a little, and then the strange feeling got very tense and my dick spitted a white substance. At that sight Tom also came and shot against my stomach. It was the best feeling ever.
We both got into the water and cleaned ourselves off, walked back to Tom's house and wanked each other again. Just like the days after.
It's a vacation I will never forget, Tom and I still have good masturbation sessions together.