When I was in prep school, my best friend was a day student and I lived on dorm. 90% of the time we spent weekends together it was at his house where I could get off-campus and have a home cooked meal, but one warm weekend towards the end of my freshman year he stayed on campus with me. It was Friday afternoon, we had just finished our sports assignments (me tennis, he cross-country running), and we were in my dorm room hanging out before dinner.
A huge storm developed...and we watched out the window as the rain got dramatically heavier and heavier. It was soon a torrential downpour, and in a moment we looked at each other with the same idea - to run around in the rain! My friend was in a flimsy pair of Union Jack running shorts and a t-shirt on. We ran outside, kicking through massive rivers of water flooding the streets...lightning bolts striking all around. I remember it vividly still today.
After the storm calmed down, we were walking back through some woods to return to my dorm room. My friend was carrying a thick stick, using it to swing at weeds and limbs along the way. Then movement in his shorts caught my eye...he had a raging hard boner going in his running shorts, and it was bobbing up and down as we walked. He noticed me looking at it...and instead of covering up, he held the ends of the stick in each hand and wedged the middle in between his jutting hard-on and his body, so that it became even more obvious. He did this for a while and it must have felt good to him, forcing it down, letting up, and back down in his wet shorts. I'd never seen a guy as open about his hard-on as he was...and could only make a lame comment like "I wish I was able to do that now" or such. He quit as we got closer to the main part of campus and somehow it wasn't an issue anymore (obviously I had a short attention span as a kid).
One of the things about this guy that I found so attractive and enjoyable was his openness about nudity and sexuality early in our friendship. He became somewhat less so as we got older...but we remained pretty close well after college. Obviously that day is seared into my consciousness still today. Half of me kicks myself for not having the balls to leverage the moment into something more...but we were out in the open and anyone that might have been out would have seen us.
O yeah...almost forgot, he had a great boner! Maybe 6 1/2 long, enough to get a little past his waistband.