Author's note: This story has a strong focus on watersports, so if that is not for you, you may want to give this one a piss- er- a pass.
*
I had just started to shampoo my hair when there was a knock on the door and I heard the click of the knob turning. I quickly turned my back to the door and looked over my shoulder, saw that it was open only a crack.
"Hey brother?" I heard Julia ask.
"Yeah, what's up?" I replied, speaking over the sound of the shower.
"Um. I...Um. Can I use the toilet?"
Thankful that the steam had covered the sliding glass door of the shower, I blushed and said "Sure."
Julia and I were close, but we probably hadn't been in the same bathroom other than to brush teeth since we were little. We tended to respect each others' privacy. At this point, I had just turned 18 and she was 23. It was summer, so we both tended to sleep in way late. Parents were off at work already, and I was taking more long showers just to relax about college starting in the fall. My sister was only in for a couple months before going back to college. Still facing away from the door I returned to shampooing my hair. I'd let it grow halfway down my back and was pretty proud of it, so I tried to take good care of it.
--
"Sure" my younger brother said, in his always-surprisingly deep voice. I hurried in, thankful that steam had filled the room and covered the glass door on the shower. I pulled down the boy shorts I use as pjs and sat down on the toilet. I was glad he didn't ask why I didn't use our parents' bathroom. But of course he wouldn't, he knew. We were a pretty private family, and we'd always been asked to stay out of their room. I don't think they were hiding anything, they just needed to keep their space to themselves.
As I let my outrageously full bladder (I had been out drinking the night before) go, I absentmindedly glanced towards my brother. As he washed his super long black hair, he splashed water on the door, rinsing it of the steam for a moment. The glass was that stuff that has an odd pattern, so it's not clear or anything. I still caught a quick glance of his ass and half-gasped and the stream of pee stopped for a second.
I shook my head and mentally admonished myself, pushing to get my business going again. "He's my brother!" I thought. "Yeah, but his ass is
cute
" my brain responded to itself. And I was right. My little brother had always been a skinny, lanky guy, but despite that his butt had a nice roundness to it. I shook my head again and tried not to think about how long it'd been since I'd gotten laid, and finished up peeing.
--
After an impressively long pee, I finally heard the toilet flush. I tried really hard to ignore the fact that I had half a hard-on. I had recently discovered some crazy sites online full of pictures and videos of chicks (and guys) pissing, and discovered it really turned me on. I'd mentioned to my girlfriend sort of in passing that I wanted to watch her while she went to the bathroom, but she wouldn't have any of it, so this was the first time I'd even been near someone while they were going. Aside from public restrooms, but that's not really the same thing.
I couldn't help but turn a little and look as she left and saw that her shorts were not quite pulled all the way back up. I couldn't see through the glass and steam, but I knew that her back dimples were visible.
I shook my head and shoved my face in the water stream, trying to ignore the thoughts that were forming at the back of my mind. I gave in shortly and masturbated fantasizing about watching my girlfriend squatting in the back yard, a golden stream from between her legs soaking the ground.
--
I didn't want to admit to myself how much the sight of my brother's butt got me going. I blamed the fact that I hadn't had sex in way too long, so anything was liable to fire me up, right? Right. I'd probably get horny looking at a bowl of fruit. Sure.
Either way, I was super wet and had to take care of myself. I went back to my room and shut the door, got my dildo out of my bag under the bed, and went to town. In my head I was getting it in every position. I didn't think anything of the fact that the guys I imagined were a little taller and skinnier than my usual fantasy fare.
--
A week or so later the situation was reversed. I had been up pretty late playing some games online with a few buddies, so Julia was already in the shower by the time I got up. I had so many sodas, to keep awake, then had just stumbled over to my bed and passed out without going to the bathroom first. I was going to pop.
I walked down the hall to the bathroom, barely awake and only that way because of my intense need. I didn't think to put pants on, so I only had on boxers. I knocked on the door, opened it a little, said "Hey sis?"
"Whatcha need little bro?" she replied.
"I've gotta piss like a mofo," I told her.