When I was 15, my brother caught me coming out of the bathroom completely naked. I wasn't expecting him home, my parents were working, and my room was right next door, so I just walked out and accidentally flashed my 16 year old brother. I didn't have a magazine body, but I was slim with solid B cup breasts, tight ass and trimmed pussy, all of which he got to see. We both kinda just froze there, then he turned and nearly ran for his room, and I darted into mine, red-faced with embarrassment.

That night, trying to get to sleep to forget, I heard from my brother's room next door the unmistakable sound of him jacking off. He was at that age where he masturbated almost every night, and didn't seem to realize that the walls were thin enough that I could hear. I never told him, though, both because I wasn't sure how to tell him without making him embarrassed and and uncomfortable, and because listening to him kinda turned me on a little.

Some nights, I would wait for him to start in the other room, then would join in from my bed. I would get completely naked, then play with my pussy, rub circles around my clit or finger fuck myself while I teased and pinched my nipples. I was always careful not to make too much noise though.

This night, however, he sounded frenzied. He was groaning slightly, and the sound of flesh hitting flesh kept getting faster. I thought I knew why, and it really made me wet. Deciding to take a chance, I got up, walked out of my room, and opened his door.

He must have heard me walking, because when I walked in he was under the covers, although I noticed a slight bulge about midway down. He asked what I was doing, and I replied that I had heard him jacking off. He denied it, of course, but I yanked his blanket off. He hadn't bothered to pull up his pants, and his cock stood up stiffly, moderately sized with some girth.

He tried to cover himself, but I took his hands away. He stopped protesting when I slid my shorts to the ground, then my panties, and told him how wet listening to him had made me. I climbed onto the bed, straddling his legs, and took hold of his cock. I jerked him, asking him if seeing me naked earlier had made him this hard. He kinda nodded dumbly, like he couldn't believe this was happening, and I couldn't blame him.

I started to suck him then and his eyes got even wider. I didn't have much experience with blowjobs, and I couldn't fit much of him in my mouth, but I licked him all over, sucked on his tip and balls while jerking him off. I must have done a passable job, because after a few minutes he groaned, grabbed his dick out of my mouth and came all over his stomach. I kissed him on the lips, told him good night and left.

Over the years we've continued fooling around, mostly late at night or whenever our parents aren't home. I love sucking his cock, and got better to the point I can make him cum in under a minute. He'll stay hard after though, so I'll swallow his load and keep sucking. He fingers me and eats my pussy and ass, and he's gotten pretty good himself. We haven't worked our way up to actual sex yet, but who knows ;)