Did I have an audience?
My wife's younger sister Meg was visiting us from out of state. She'd had a pleasant stay. We'd visited the zoo, gone on a couple of nice walks, seen the big city and lots more. By the end of the week, it was time for her to head home.
My job, as always, was to drive our guest to the airport. And as always, it seemed, the flight was leaving very early in the am. I'd dragged myself out of bed early while my wife snoozed and headed for the shower.
To my surprise, Meg was already up and finished with her shower. I asked if she minded if I got in while she got ready at the sink. She said not at all, excused herself briefly while I climbed in and then came back in once I was settled and the curtain closed.
It's important to understand the layout of the room here. It's really a very typical small bathroom, with the sink and lav right inside the door when you walk in and the shower along the same wall just beyond that. When you're standing at the sink you can't see the shower unless you step back from the sink and look over.
With most showers that have an opaque curtain, that wouldn't, but ours didn't. The shower curtain was lightly translucent, which was nice because it let in a lot of light into an otherwise pretty dark enclosure. You could, I came to know, see the outline of someone showering, but that was about it. There wasn't much detail.
That is, unless the person showering was really close to the curtain, in which case you could see a surprising amount of detail.
As I started my shower I heard Meg come back into the room and close the door behind her. Through the small gap along the side, I could see a passing glimpse of movement, nothing more.
But the idea of standing naked right next to my wife's hot younger sister was getting me turned on, and predictably, I started getting hard.
Now, I always kept a little bottle of massage oil in the shower, and I instinctively grabbed for it and squeezed a few drops onto my hardening tool. Just for the visual, my dick is decent sized, about 7-1/2 inches and pretty thick too.
As I stroked I got a little bolder. That always happens. And as I got bolder, I started to inch closer to the curtain, holding my hard cock nearer and nearer to the curtain, effectively making it more see through all the time.
Within a few minutes I was stroking full on, right up against the curtain, and I knew that if Meg looked over, she'd have been sure to have caught a real eye full, her naked brother-in-law stroking his big cock behind a nearly transparent plastic curtain.
Of course, from my perspective, she was invisible, standing well away from the curtain and off to the side. Was she watching? I imagined she was and went for it. Before long, I was shooting, spraying my cum all over the curtain and rubbing my still hard cock up and down and all around the plastic. It must have looked really fucking hot, that is if anybody was actually watching, which I had no idea of.
It wasn't until a few years after the fact that we were visiting with Meg and her husband when the subject of bathrooms and shower curtains somehow came up. She looked over at me and remarked, 'You know, I really like translucent ones,' she said, smiling and slying winking so my wife wouldn't notice.
I'd never jacked off to a wink before, but since then, I have . . . many times.