I was 12 when my brother saw me wanking in a shower... i was showering but forgot to lock a door. i was on my knees on a floor and stroking hard. first i didn't see him (i was so excited =D) then he shouted something like "what the fucking you are doing!?"

we shared our bedroom when we were younger.. he has seen my boxer-tent many times during that time, so many times woke up with a hardon =D