I know some don't approve of this ... I really never 'saw' us as siblings.
Hey, If this is not your thing, please delete and move on. No worries.
My step brother is very cool. We started living together when we were 16, so he was more like a regular guy than a brother. I walked past his room during the first month we lived together. He was listening to music with earbuds and looking at porn. I just stood at the edge of his door and watched until he came. It felt kinda dirty getting turned on watching. Just as he was cleaning up, he glanced toward the door and busted me, and put a pillow over his privates.
Clearly he was embarrassed ... he asked how long I was standing there.
I walked into his room, picked up the porn and asked what turns him on. I learned he likes athletic bodies, runners or gymnasts, pointy nipples and tight butts. I couldn't believe we were having this conversation!
After that first time I watched it broke the ice between us. We both learned a lot from each other. We weren't shy about sharing the bathroom, seeing each other naked. I would walk to the bathroom wearing only shorts, panties, or thongs. Sometime he would brush his teeth naked while I finished my shower. When I slid the shower door open, he'd be standing there, total, complete erection. He'd check me out naked, dripping wet, and sometimes I'd tell him to join me, and I'd jack him in the shower before school. I would get rubbed out when I wanted.
He would also hang around his room at night in his jockey shorts or bikini briefs. He was really into sports and had a nice body. I don't know how many times I gave him a handjob and the first bj after I asked and watched him shave smooth, and helped get him a shave almost as good as a wax!!!
I let him finger fuck me, sometimes let him use a dildo/vibrator. I would wear tight tanks, no bra, and string bikinis, sometime thongs. We had the upstairs to ourselves, so we could do what ever we wanted, for the most part. Both of us liked showing off.
Sometime we'd just watch each other masturbate. We never told anyone and don't really talk about in any more. It was very, very hot ... we don't see each other too often now, really for the last two years.
A good friend is getting married ... would love for him to strip or more for the girls ... Would love to see his naked body and stiff wood again, his dick is aesthetically beautiful when pointing straight upwards ... I know my friends would think it's very strange for me to even watch.