The reason I was so surprised this happened is because, on a day that there was no work or school, my family always sleeps late. Waking up at 10 or 11 is nothing uncommon for us. That's why one Saturday when I woke up just past five it caught me off guard. For some reason, I could not fall back asleep, even after laying there for almost an hour. The sun was just starting to come up so I decided to go downstairs and watch TV or something. I threw on a shirt and walked downstairs, but when I got halfway down I thought I heard something, so I quietly went the rest of the way down and looked around the corner and the TV was already on. Not only that, there was a porno playing and my younger brother was laying on the couch, completely naked and spread out with an erection. The way the couch is set up I was behind his head, so there was no way he would know I was there.
For the first few minutes I just stood there shocked, not only with what was playing on the TV, but also that he was laying there naked, not worried that someone might see him. I guess since everyone sleeps late, he figured he had a few hours to himself. Anyway, every few seconds or so, he would reach down and give himself a few strokes to stay hard, then put his hands back behind his head. Just seeing it was getting me horny as well, but I didn't do anything, I just observed. I must have stood there for a good 15 minutes before he started stroking slowly and constantly. Not only that, but every so often bring his hand to his mouth and lick off his precum. I couldn't believe that my brother licks his own cum.
When the scenes changed and it showed a woman getting absolutely pounded by a young guy that was hung like a horse, he started stroking faster and faster, finally shooting his load all over himself. I watched him lay there for a minute as his erection went down before he picked up his underwear and wiped himself off before tossing them back on the floor. I was about to go back upstairs and masturbate, but then I saw him start fondling himself again. I waited and waited, and eventually his penis grew and he started stroking again, this time digging his feet in and humping the air. Seeing him needing to cum twice was more than I could take, and I slipped off my boxers and started masturbating along with him. It felt good, but it wasn't enough, so I took off my shirt leaving me as naked as him. By now my penis was burning hot and throbbing and aching to cum. If I lasted 5 minutes I would be surprised, because it seemed like no time that I was having my own orgasm, blowing into my boxers. I was spent so I just watched him finish, and before long I heard a quick 'UNGH' as his cum rolled down his hand and shaft.
This time when he wiped himself off, he turned off the TV and took his tape out, so I hurried upstairs and got back into bed, acting like I was asleep. About a minute later I heard him come up, and when he walked by I saw his exhausted penis flop around. I waited until I thought the coast was clear, then put on a clean pair of boxers and went to the bathroom. When I came out I stepped up to his room and heard him breathing heavy, so I knew he was asleep. I cracked the door open just enough to see him in bed, laying there naked with his now-shriveled penis resting on his leg.
I closed the door and went back to my room, and I felt myself getting hard again. I took my boxers back off and started stroking again, bring myself to my second orgasm of the morning, this time cumming into a tissue. By now I was exhausted so I just pulled the cover over me, falling back asleep naked for a couple more hours.
When everyone was up, my brother didn't act any different than normal, but I knew exactly what had happened. A few days later though, I started thinking about what our mother must have thought seeing both of our underwear covered in cum. She never said anything, but why would she? We're both boys and we both obviously masturbate. It's still kind of embarrassing though.