One I can think of is when I was in 6th grade sitting in darkened math class during a boring lecture. I was going commando and I had a hole in my pocket. So needless to say I don't remember much from that lecture because I was to busy stroking my dick.

I believe I was 6. When I'd go to bed I would tuck it in between my thighs, lay on my stomach and slowly hump. I had to be discreet because me and my big bro shared the same bed & I didn't want him to think that I was weird. But little did I know that he was probably jacking every night too.