The other day my brother and I were in the house on our own. John, my brother is 19 and a regular guy. Anyway, I was feeling horny and was lying on my bed with my shorts off and my dick in my hand. I'd forgotten to completely shut the bedroom door and there was a gap and suddenly I saw John was standing there watching me. I hadn't even heard him come up the stairs.
For some reason that excited me and I started to put on a show for him, pretending of course that I didn't know he was there. I stroked and pumped my dick, fucked through my fists and made it obvious that I was in another world, totally absorbed in the sensations I was giving myself with my hand.
I moaned and groaned, then I humped the bed but I didn't do that for long as I wanted to make sure he was still there by sneaking a look at the door. Sure enough he was and I was also sure he was masturbating as well because I could see his hand moving.
I was amazingly turned on as I rubbed myself, my free hand rubbing all over my body, my legs now spread apart. Then I exploded, my cream shooting out all up my belly and unable to stop the loud grunts and gasps as I gave myself the most incredible pleasure ever.
I lay there for a few minutes with John still watching me for a while. Then he disappeared and I got off the bed and got dressed and went into the passage. On the floor outside my door were damp creamy patches where my horny brother had shot his load!
I've not mentioned it to him of course. I wonder what he'd think if he ever read this. I'm off to finish jerking off now as my cock is throbbing hard.