When I just finished my sophomore year of college, my family decided to buy a vacation cabin in the northern part of our state. It was situated in a heavily wooded area right on a lake and the brochure promised no interruptions and no nosy neighbors--the closest person would be half a mile around the bend of the lake. It came with a free weeks worth of boat rental, so I was excited to go. My sister, on the other hand, decided to stay at home. My guess she was going to have some sort of party.
The cabin was a large two story building shaped like an L. It had 4 bedrooms, a kitchen, an indoor hot tub, a patio with a grill, and the rest of the works. Even with my parents and me at the cabin, only 2 of the rooms were being used, so we invited our neighbors and close family friends to come. I knew them well and played with their kids when I was growing up, so I wasn't surprised or upset by the decision at all. They were bringing their two daughters, Megan and Ashley, along. Megan was a year younger than me and Ashley was two years older.
After a long drive north, we arrived at our Cabin and unpacked. My parents and my neighbors took the two bedrooms on the second floor, while I took a bedroom downstairs and Megan and Ashley shared the other. The first few days were normal enough, we swam, rented a boat, tried to water ski, and grilled a lot of food. In the middle of the week, my parents were getting tired of the constant exposure to nature, so they were going to drive to the near by town and look at antiques. My neighbors decided to join them, leaving just Megan, Ashley, and me.
After a few hours of swimming, I got tired and decided to go in and watch some TV or play video games. Ashley was sunbathing and Megan decided to continue swimming. I went straight for the shower to clean off the lake water. The builders were smart and built the bathroom to accommodate a large family, because it was the only bathroom in the house. It was actually split into two pseudo-rooms, with the first being a sink, a toilet in a stall, and a small closet for towels and supplies. In the back was a frosted glass door the opened to another small room with two shower stalls, each separated by more frosted glass and a curtain. The back room could be locked in case someone wanted to take a private shower. Earlier that week we discovered the curtains didn't have their rings to stay on the shower rod, so we just folded them up and set them aside. They weren't necessary anyway if only one person was taking a shower, and if two people were going to take a shower, it was either my parents or my neighbors, so it wasn't an issue for them to see each other naked.
The tricky part came when someone needed to use the bathroom while someone was showering. Most of the time it was a "just wait" matter, but if they really had to go, they knocked and the person showering would make sure nothing was too visible through the frosted glass door. The person would come in, do their business, and leave. I never had to act on that plan, but Ashley and Megan did a few times, probably because they were more comfortable with a sister peeing or showering a few feet away from each other instead of their parents or neighbors. Anyway, I stepped in, put my change of clothes in the first room, went in the shower area and started. Although I had a private room, I learned my only chance for guaranteed privacy was when I was in the bathroom. This meant my showers became my time to jack off, which I had to do a lot when I kept seeing Megan and Ashley show off their bodies in bikinis all day. Today I went really slow because I knew the girls were busy outside and the others weren't even on the vicinity.
I used some soap to lube up and started stroking. Because my actions caused me to warm up considerably, I turned the shower down a little. Besides, I didn't want to waste hot water. I continued my stroking and got into it, fantasizing I was fucking my ex-girlfriend. We broke up over a small thing, but we never put the effort to start again. Sometimes I regretted that decision because the last few months had been a dry spell. I thought about my ex and how we slept naked together. She loved it she woke up and felt my morning wood poking her butt. Just as I was getting into the fantasy, a distant click brought me back to reality. I looked at the water temperature handle and saw it had slid a little, so I didn't think much of the click. I went back to my fantasy and continued. The water was turning cold, so I turned it off. I needed to cum, so I decided to risk finishing my session in my room.
As I opened the shower door and entered the main part of the bathroom, I heard the toilet flush. I nearly jumped out of my skin! I was stark naked and dripping water, and someone was in the bathroom with me! Not only that, but it was a guarantee they knew I was masturbating since the squishy noise is so distinct and audible. I was frozen with shock and fear. All I could do was watch the toilet stall's door slowly open, revealing Megan as she stepped out.
She looked up at me, then traced my figure with her eyes. She rested her gaze on my still hard cock. She was still wearing her swimsuit and was still moist from her swim. Her bikini revealed her curves, giving me a good but not perfect look of her round breasts. They looked to be about the size of oranges, so around a B cup. Below was her padded waist. She wasn't chubby by any definition of the word, but she had the traditional Midwestern meat. Her brunette hair was wet, messy, and flowing all over. It covered parts of her breasts and face, giving her the appearance of a girl that just had wet and wild sex. Most noticeable about her appearance were her long legs that shaped perfectly into a divine ass, which I had spent a good part of the morning looking at. The extra cushion gave it a nice, soft look that was unbelievably tempting to grab. At one point I imagined myself napping on her butt, using it as a nice soft pillow on the sunlit beach of paradise.
Her eyes were still feasting on my cock as she said, "Still hard? Are you a porn star? I thought most guys go soft after cumming." She had essentially admitted she caught me jacking off, so I turned red and just fumbled around with hands. I wasn't sure if I should be hiding myself or not, so they just flapped back and forth, sometimes covering up my dick and sometimes not. She looked a little amused, but at a the same time, had a look of lust.
"Well, uh," I stumbled, "being a porn star would be fun, but sadly I'm not one. I'm still hard because I didn't get to finish. The water went cold." I figured lying about jacking off was a moot point, so pure honesty was my only option.
