This is a story back when I was 15 and my younger brother was 14. It was in the lazy days of summer vacation, and he had been back from his month of summer camp for about two weeks. We didn't exactly have the most things in common together, as he was an outgoing extrovert and I was a shy homebody. Going along with that, it seemed like he was horny all the time. I mean I get it, I'm just a year older and I did my fair share of jerking off, but especially once he came back from camp, it was like he had a hand in his underwear 24 hours a day. It was even more prevalent when mom and dad were at work because he wound run around the house naked until they got home. I guess he got used to the freedom of a bunch of boys going through puberty being left alone that he just couldn't help himself. Anyway, it's not like I was never naked myself, but it was usually just after getting out of the shower or early in the morning before I decided to put my clothes on.
On this particular day, one of the chores on my list was to do the laundry. There was no sense in dirtying up more clothes to wash, so I just stayed in my underwear as I made the rounds. After I gathered what was in the hampers I went into his room and there he was, naked on his bed, tugging on his cock looking at a dirty magazine. Even seeing me there he didn't stop. "You got anything for the laundry?" He looked down and said "yeah, those socks and underwear can go." As he said it he went back to his jerk-off material. I rolled my eyes picking them up, asking him "are you going to do something productive or just jerk off all day?" "Leave me alone...I'm busy." "Where did you get that magazine, anyway?" "Bought it off a counselor. Cost me a month's allowance." Never making eye contact, he kept right on masturbating like I wasn't even there. I threw his stuff in the basket and went downstairs to the washer, pissed off that he didn't have to do jack shit around the house. Throwing in the whites, I pulled off my underwear and tossed them in, leaving me as naked as he was. We had a small TV in the basement, so I just sat in one of the lawn chairs nude as the washer did it's thing.
I had probably been down there for about a half hour and the load was rinsing when he walked down with a couple more shirts in his hand, tossed them in my lap and said he found those in his bag. He started walking away and I tossed them back, saying "you're too late, it's already rinsing." Angry, he threw them back at me and said "just open the lid and put them in!" I stood up and threw them back, yelling "that's not how it works you lazy asshole! It's too late!" He stomped up the stairs, called me a dick and muttered something that I didn't understand. I sat back down and the load took about another 10-15 minutes before it got moved over to the dryer, and when that was going I went back upstairs to get the next load. Looking around he wasn't in the living room, the kitchen of his room, so I was kind of curious where he was...until I looked in my room. There he was...on my bed, kneeling over my pillow with a scowl on his face, furiously jerking off. I saw red. It took me a few seconds before I could even gather the words, but I then yelled out "what in the fuck are you doing you little bastard?!" As soon as I said the first word it was too late, as he started cumming on my pillow. Even though he was in mid orgasm, he looked over with a surprised face as he wasn't quick enough not to get caught. I wanted to strangle him. I ran into my room and jumped onto my bed but he crawled off the other side and ran out and down to his room. Before I could get there he closed the door and locked it, but I guess he didn't know how easy the doors were to unlock. I grabbed one of the keys from a door frame and unlocked it, and he was standing in the middle of the room, panting and shaking with cum dangling from his cock head. "I'm sorry, I'm sorry! I shouldn't have done that, I was just mad at you! I'll wash it!" I didn't even say anything back I just looked around the room until I saw the magazine on his desk. I grabbed it and he pleaded with me, "please, not the magazine! I didn't mean it!" as he tried grabbing it back. Twisting around, I managed to get my foot on his stomach and pushed him back onto the bean bag chair he had in the corner. At first I wanted to tear it up, but I had a better idea. With all of the commotion and wrestling around with him naked, at that point I had a raging hard-on. I opened it and found the girl he was tugging to earlier, set it on his bed and started stroking myself standing over it. I glanced over at him and he was just watching me with a shocked look. I had never masturbated in front of him until that point, and just the thrill of it had me leaking precum in a hurry which started dripping onto the page. It wasn't long before I could feel my own orgasm staring to build, and I held up the magazine and aimed, rose up on my tippy toes and shot a thick, ropey, gooey two-day load all over the girl. I just stood there breathing hard, squeezing out every drop that I could, flinging it onto the pages. When I was finally finished I closed the magazine and pressed the pages together, then tossed it back to him. He caught it and just sat there with his knees up at his chest, staring up at me with a defeated look on his face. I walked out, my half-hard cock swinging around, feeling like a king.
I went back to my room and took off the pillowcase, wiping my own dribbling cum onto it before tossing it into the basket of whites. I took them down and started the next load, and after about 20 minutes he slowly walked down and again said he was sorry for masturbating on my pillow. I asked him how the magazine looked, and he said he wiped most of the cum off but some of the pages are sticking together. I could have apologized too, but frankly I'm kind of glad I did it. Not only that I had to stay dominant. If I caved he would do some stupid shit like that again. "Well, maybe you'll listen to me from now on." He just kind of nodded and slunk away. I felt proud of myself. Not just for standing my ground, but it was the first time anyone had watched me masturbate. It almost felt like something woke up inside me at that point.
The next morning, I got up and went to the bathroom, my morning wood leading the way. Coming back I glanced in his room and there he was in bed, naked like always fondling his erection. I walked back to my room, but then decided to extend the olive branch. I slipped out of my underwear and walked back to his room, my own cock sticking straight out. I stood in his doorway and asked him "have you cum yet this morning?" He looked over and said "no not yet, why?" "Come on" I said, walking back to my room. By the time he walked in I was laying in bed, slowly stroking myself. "You want to masturbate with me?" He kind of smiled and shrugged, saying "yeah, sure." I motioned to the other side of my bed and told him to get in. He grinned and ran over, jumping in next to me and quickly started stroking himself. "Whoa, slow down. Don't rush it, just enjoy it." He slowed down and kept an easy pace, matching me almost stroke for stroke. "So what happened at camp to make you so horny all the time?" "I dunno... we were just naked a lot in the cabin and we all jerked off every night. Pretty much every morning, too." "I guess you were looking at the girls there, huh?" He kind of grinned. "Yeah...especially when they were in their swimsuits." "Don't blame you. I would have been jerking constantly if I was in that situation too." We got quiet and kept stroking, the sounds of precum getting squished filling the room. Going for a few more minutes he then said "oh man, I'm gonna cum." I told him "no, not yet. Edge for a while." "What's that?" "When you think you're going to cum, let go and hold back like you're trying not to pee." He then stopped stroking and got a pained look on his face, twisting around as his feet scrunched, letting out some muffled whimpers. It took a few seconds but he finally relaxed, taking deep breaths with his cock bouncing back and forth. I then told him "now when you start stroking again it's gonna feel really good." He gently grabbed himself again and stroked, closing his eyes and moaning a soft "oooh..." as his toes pulled back and spread apart. "How many times can I do that?" "As many times as you can hold back. I do it a few times until I'm ready to cum."
This went on for a while longer, he would quickly stroke right to the edge and stop, squirming around as he struggled to hold back his load. I kept a slower pace, letting mine build and gradually fade over and over. He eventually got to the point where he asked "can I cum now? I can't hold it any longer." "Yeah, I'm getting pretty close too. Go ahead." He started stroking like there was no tomorrow and in mere seconds he was groaning "oh, I'm gonna cum...I'm gonna cuuummmm..." I then watched as a thick load shot from his piss slit all over himself. He grunted as he stroked, his orgasm rippling over every inch of his body. I could almost feel his orgasm where I was. Finally subsiding, he lay there breathing hard, covered in sticky goo. "That felt SO GOOD." "Told ya. I'm getting pretty close too if you want to watch me cum." He slowly sat up and crossed his legs, watching closely as I stroked. I sped up my pace, my toes sensually wiggling and spreading as I inched closer and closer to my own orgasm. I then quietly said "here it comes..." and as his eyes were fixed on my cock I let go, the first rope shooting at least a foot in the air before splashing back down on my hand. I kept going, each pulse almost feeling like their own, separate orgasms. I was almost numb when it was over, feeling like I could melt into the mattress.
When it was all said and done with, I told him we should probably take a shower to get rid of all this cum, and we went to separate bathrooms and rinsed away all the sticky seed. Later on he came back and thanked me for showing him that, and that he's going to do that every time he jerks off. I guess that's what older brothers are for.