I was so horny when I was a kid that I used to come home from school and masturbate myself into a frenzy. My older brother always stayed out until about 6pm, come home for dinner and then go out again or just go to his room. My dad worked construction and usually came home at 4:30.
We only lived with my dad. One day I came home early from school, it was like 2pm, put the stereo on (which when I think back on this event was much too loud) and got naked in my bedroom and started masturbating. I have a very big cock and was big even back then. Anyway I was so skinny that I just crossed my legs Indian style on the bed, bent my head down and started blowing myself.
It was an excellent feeling and wanted to blow a load into my mouth, when suddenly my stupid bro appeared at the door. I didn't hear a thing because of the stereo. He frightened me and I stopped, but he said 'no, keep going, I'll help you, I do this too sometimes'. He pushed my head all the way down my cock, and started playing with my big testicles, and while I sucked he masturbated me at the same time.
Well I came a huge load of silky jism, and while I was cumming he said don't you dare lose a drop of it, and made me take the whole meaty, juicy thing into my mouth and swallow it. He just walked away and said now that's good stuff! don't ever waste it'. That was just a few of the good times I had with my brother.