It all started when my best friend started sleeping over every now and then. we played Truth or dare, we always picked dare, they started just random silly things but eventuated in to flashing for a few seconds down to flashing for minutes or so while the other person inspected the privates and back side of the other person. The next time he slept over we convinced my mum to set up a tent in the backyard, this allowed us to have a bit more privacy and we didn't have to worry about anyone walking in on us at night.
I remember one time playing cards and when someone lost the other person picks what they have to do. The first few we had to lay still with a cover over our heads while the other had a torch (because it was dark) and feel, poke and look at the other.
A few week went by and the topic of masturbation came up, then that was it, out dares moved on the the next level. We sat head to toe with one hand on each other pumping up and down on our 5inch dicks at the time trying to time so we cum at the same time.
Our Playing got a lot more serious over the next year, I then got a g/f and we drifted apart pretty quickly, I sometimes think back to this when I am masturbation my self when my wife is on the road traveling for work.... Good Times