I grew up in the late seventies, and my parents were free thinkers. Every Summer our family vacationed for two weeks at a campground nestled between the ocean beach and surrounding wilderness. It was a beautiful and peaceful location, and we always had lots of fun. About twenty or thirty families were there during the same two weeks, and it was usually the same families each year, so everyone pretty much knew each other.

But this was no ordinary camping experience. This was nudist camping, at least for the two weeks in summer that the campground was rented to our group. We had been going for so many years that I didn't think much about it. Seeing naked bodies of all ages and sizes was just a normal part of our camping experience.

But something changed the year I was thirteen. I was a skinny boy with brown hair, and my life experiences were about to change in a major way.

My parents packed up our station wagon, hitched our camp trailer, and drove out to the campground. The drive took about four hours.

We parked in our usual space at the end of one of the spur roads. It was a nice spot, and quieter than most other parts of the campground. My parents set up the camp trailer, as well as a large tent nearby. When I was younger, I slept in the large tent with my parents. But when I turned twelve, they allowed me to sleep in the camp trailer by myself. I liked it better, and I think my parents appreciated having the tent to themselves.

As we were setting up, the family that always stayed in the space next to ours was just arriving. They had two daughters. Jenny was my age. Carrie was two years older. Jenny and I played together each year, and we had lots of fun swimming, hiking, and just hanging out. We were usually the only ones our age in camp. There were lots of little kids, and a few older kids that were Carrie's age. But we were the only ones in our grade. Jenny and I became good friends, and sometimes we even talked on the phone throughout the year.

Jenny's family arrived in their sport utility vehicle, towing a shiny silver Airstream trailer. It was really nice inside, and about the biggest trailer of any family at camp. As they pulled by our camp site, I looked up and Jenny was sitting in the back seat, smiling and waving. I waved back.

My family went next door and greeted our friends. We all said 'hi,' and there were lots of hugs.

Jenny had grown up a lot since the year before. She was dressed in jeans and a checkered shirt. She also had new braces. I could tell she was sensitive about them, so I tried to reassure her that it was okay and didn't look bad at all.

Both Jenny and her sister Carrie had light brown hair and blue eyes. They both looked a bit like their mom. Cute, with great smiles. Carrie was fifteen and more developed than Jenny, with the figure of a young woman. Carrie was wearing jeans and a light colored top.

After some small talk, we all went back to setting up our own camp sites, and agreed that we would all go to the picnic area that evening for the opening potluck.

After we finished setting up, my parents went into their tent, came back out naked, and sat down in some lawn chairs at our camp site to relax and chat. I thought nothing of the nudity. It was normal.

I went into the camp trailer, stripped off my clothes, and went back outside, wearing only sandals.

As usual, I wandered next door to see how Jenny's family was doing. Since they all slept in their trailer, there was less to set up. They were already done. Jenny's mom and dad were naked and setting up a clothes line.

"Hi, John," Jenny's mom said to me. "Jenny should be out in a second."

"Okay," I said. "Do you need help with anything?"

"No, I think we're about done," she said.

The door of their Airstream trailer opened, and Carrie came out naked.

"Hi, John," she said, with a smile on her face.

Carrie looked stunning. Her body was like a model. Thin waist, perfectly round 'B' cup sized breasts with half dollar size pink areola, shapely hips, and nicely trimmed light brown hair on her crotch. Carrie also had deep bikini tan lines that year.

"Hi," I said.

I got a strange feeling. One I hadn't felt before. Sure, I had admired Carrie's naked beauty in past years, but that year I felt different. She was hot, and my hormones couldn't stop me from staring. This was a new feeling I never before had at camp.

Thankfully, Carrie didn't notice me staring, because she had turned to her parents.

"Can I go over to Jake's and see if he's here yet?" she asked her parents.

Jake was a boy her age that she was always hanging around with, just like I hung out with Jenny. But it was common knowledge, even to her parents, that Jake and Carrie were boyfriend and girlfriend. In the past two years at camp, they even held hands. It was an unwritten rule at camp that there were no public expressions of sexuality. No kissing on the mouth, or those kinds of things. But it was okay for couples to hold hands, and that's what Carrie and Jake did.

"Sure," Jenny's mom said. "But make sure you get to the picnic area for the potluck at six."

"Okay, mom," Carrie said, as she walked off and headed down the road toward the other side of the camp.

I couldn't help but admire Carrie's tight butt as she walked off, with perfect deep bikini tan lines diagonally crossing each cheek. I felt funny again, and realized I was staring at Carrie's body.

The door to the Airstream opened again. Jenny came out. She was also naked. But this was a different Jenny than I had ever seen.

First, she had boobs. Not big. Maybe 'A' cup, at most. They were firm and pointy, with small pink areola, and nipples that stuck out. She also had deep bikini tan lines, just like her sister, which called even more attention to her white breasts framed by her tan body.

Second, Jenny had a figure. The straight lines were now a bit curvy. She also had a small patch of very light brown hair on her crotch.

I got the same new feeling again. Jenny looked hot. I wasn't sure what to do. That was not a feeling I should be having at camp, and I became aware that if I didn't do something to control my feelings, I might get an erection, which would be totally embarrassing and inappropriate.

"Hi, John," Jenny said with a big smile, exposing her braces again.

Jenny was glowing, with her light brown hair, blue eyes, and nice tan.

"Hi, Jenny," I replied.

I could feel that my cock was now fluffed, but I was pretty confident it wasn't hard. I didn't dare look down. Instead, I tried my best to distract my thinking from Jenny's hot body to chatting with her, and catching up on things since we had last talked on the phone. It worked, at least for the time being.

Jenny and I chatted for an hour or so, catching up on school, sports, and friends. Then it was time to head down to the picnic area at the center of the campground, where each evening the campers joined in a potluck and played cards and board games on the picnic tables, as well as games on the grass, like volley ball.

My parents and Jenny's parents gathered some food and towels, and we all headed to the potluck. There were already lots of folks there, including Carrie and Jake, and his parents. Jake had grown up even more since the year before. He was always the athletic type, but now he was looking more like a young man. Jake had short dark hair and a muscled body. He was at least six inches taller than Carrie.

We all had a great time, then went back to our own camp sites after it got dark a couple hours later.

The next two days at camp we all went to the beach. It was sunny both days, and we had a lot of fun.

Once I got used to the nudity again, I didn't have any more of those uncomfortable sexual feelings. That's not to say I wasn't admiring some of the gorgeous naked female bodies at camp, like Carrie and Jenny. But things were feeling back to normal.

I also noticed that Carrie and Jake were wandering off for hours at a time. But I didn't think anything of it.

A few days later it was overcast. My parents decided they wanted to hang out at the picnic grounds that day, talking and socializing with friends.

Jenny and I decided we would go on a hike. So we got on our hiking boots, and Jenny packed a lunch for both of us and put it in a small backpack that I put on. Jenny looked super cute, naked and wearing only hiking boots. I started to stare at her body and got that feeling again, but shrugged it off.

We headed to our favorite trail, with Jenny in the lead. On one side of the camp there was the beach and ocean. On the other side was a small forested closed valley with a creek running down the middle. The sides and end of the valley went up to a ridge line at the top. Our favorite trail wound its way up the right side of the valley.

Jenny and I headed up the trail, with Jenny in the lead. I couldn't help but admire her tight little ass, with tan lines only just starting to fade.

The first part of the trail was pretty easy hiking, with a gentle incline that ended at a landing overlooking the trail, the valley, the campground, and the beach. But Jenny and I liked to go to the very top.

To the right of the landing, the trail continued, but you had to immediately climb up a steep area for about fifteen feet. Not many campers went beyond the landing. At the top of the steep part, the trail continued to the top of the ridge line. But the trail was narrower, and less defined.

Jenny stopped and turned around when we got to the landing.

"Want to go to the top?" she asked.

"Yeah," I said.

"Turn around," Jenny instructed.

I did. Jenny unzipped the backpack I was wearing and took out a water bottle. She had a drink, then offered me some. I took a drink and handed the bottle back to her. She put it back into the backpack and zipped it up.

"Let's go," Jenny said, leading the way again.

The steep part of the trail required that you use your hands to climb up an incline on all fours. Jenny went first. As she did I got view of her body that I had never really noticed before. Directly above me, Jenny's legs were spread and I had a close up view of her pussy and ass. Jenny's outer pussy lips were white and slightly puffy. Her inner pussy lips were narrow, tight, and pink. Her asshole was puckered. I didn't see any hair, so the view was unobstructed.

By the time she got to the top of the steep part of the trail, I had enjoyed a number of close views of Jenny's pussy and ass.

When Jenny got to the top of the steep part, she didn't turn around. That was a good thing. I got to the top and followed her along the trail. But my cock was half hard and sticking straight out from my body. I just pretended it wasn't there, and continued along the trail behind Jenny, trying not to look at her ass or think about what I had just seen.

When we got to the top, we continued along the ridge line to the right. The trail ended at a spot with an amazing panoramic view of the ocean, beaches, and campground below. That's where Jenny stopped and turned around. Thankfully, my erection had subsided.

I took off the backpack and we pulled out a beach towel, a water bottle, and our lunch. We had a small picnic lunch at the top, enjoying the view.

After lunch, we headed back down the trail. Jenny led the way.

When we got close to the steep part and the clearing, we noticed some movement and heard something off to the right. We both looked at the same time.

In plain sight in the landing was something that stunned us.

Jenny's sister Carrie was on all fours on a towel, facing toward the campground, so she had a full view of everything downhill. Behind Carrie was Jake, on his knees, with his hands on Carrie's hips. Jake was thrusting his hips back and forth toward Carrie's body, and his hard cock was gliding in and out of her pussy.

Jenny and I had inadvertently walked upon a scene where Jake was having sex with Jenny's sister.

Jenny and I looked at each other with wide eyes and swallowed hard. Then we looked back to the scene.

The problem was what to do at that point. If we stayed where we were, they would eventually see us. We were in plain sight. If we scaled down the trail, they would surely hear us. We could try to go back up the trail without being seen or heard, but I think we both wanted to watch.

Jenny found the solution. She walked quietly closer to the scene of Jake fucking her sister, and waved me along to follow. About eight feet closer to the landing, and down a ways from the trail, was a tree with a wide trunk. Jenny stopped behind the tree and put her left hand on the trunk, with the right side of her body and head peering around the side of the tree down at the action below. She looked back and me and waved me to follow her. I did, and put my left hand on her left waist, with the right side of my body and my head behind and a little further to the right, allowing me to also watch. It was a good vantage point, with cover from the tree trunk and the shadows of branches overhead.

Jenny and I remained quiet as we watched Jake continue to fuck Carrie. We were close enough to hear quiet moans from both of them, as well as the sound of Jake's hips slapping Carrie's ass as he continued to slam his hard cock into her pussy.

"I'm gonna cum," Jake announced.

Carrie immediately lurched forward, causing her pussy to separate from Jake's hard cock.

Carrie spun around, remained on all fours, but facing Jake. She took her right hand and grabbed the base of his cock and put the swollen purple head into her mouth. Jake put his hands on Carrie's head and started to fuck her mouth with the end of his cock.

"Ohh," Jake moaned.

His hips twitched, and he moaned some more, still fucking Carrie's mouth, but in shorter irregular strokes. It was clear to me that he was having an orgasm and shooting cum into Carrie.

A few moments later, Jake gently pulled his cock out and away from Carrie's mouth. She looked up at him and smiled. Carrie moved her right hand down the shaft of Jake's cock from the base to the head, and leaned down and licked the tip of his cock. Carrie let go, and both of them stood up. Jake's penis was starting to shrink, but still pretty big. The two of them hugged and kissed.

Jenny and I watched it all.

Carrie picked up and folded the towel. Both of them left the landing and started down the trail, with Carrie in the lead. As they left the landing, they didn't notice Jenny and I behind the tree on the hillside above the landing.

After they were gone, Jenny looked over at me.

"Wow," she said.

"Yeah," I responded.

Jenny turned around, and I took my left hand off of her waist and backed up a step.

Jenny's eyes immediately fell to my crotch. In an instant I became aware that I had a full erection.

Jenny stared. I got embarrassed.

"Looks like you've got a hard-on too," Jenny said as she glanced up at me with a smile, and then looked back down at my hard cock, pointing straight up from my body.

There was a moment of awkward silence.

"So does it just go away?" Jenny asked.

"Yeah," I said.

"How long does it take?" she asked.

"It shouldn't take long," I answered, but I knew that it was super hard and it was going to take a while, after what we had just seen.

There was a few more moments of awkward silence.

"It's not going down. You're really horny now, aren't you?" Jenny asked.

"Yeah, I guess," I replied.

"Do you want to jack yourself off?" Jenny asked. "Would that help?"

It would, but I wasn't going to just masturbate myself right then and there. I had been masturbating for a year or so by then, but always in private.

"Yeah, but," I started to answer.

"I want to watch," Jenny said.

"I don't think," I stammered.

"Do you want me to do it?" Jenny asked.

"Do what?" I replied.

"Jack you off," Jenny answered.

"Um, I guess," I said, swallowing hard.

"So what do I do?" she asked.

There was no lubricant or anything to use, so I wasn't quite sure.

"Well, I guess you could just stroke it with your hand," I said.

"Okay," Jenny said, as she moved up and over to my right. She placed her left hand on my back just above my right butt cheek and took her right hand and wrapped it around the shaft of my cock just below the head.

Jenny's hand on my cock felt great, and she hadn't even moved it yet. I put my right hand on Jenny's left hip.

"So what do I do?" Jenny asked.

"Just go up and down," I instructed.

Jenny moved her hand up and down the shaft of my cock. Because there was no lubricant, her hand didn't slide over the skin of my cock, it just moved the skin. It didn't matter. It felt good.

But after a while I wanted relief, and I didn't know how to describe what to do, plus I was too embarrassed to describe it anyway. So I wrapped my left hand around Jenny's right hand and guided the action up and down my cock to maximize the pleasure. She went along.

I looked over at Jenny and asked her if I could touch her butt. She said okay, so I moved my hand from her hip to her left butt cheek and started squeezing it gently. I looked back down, and continued the stroking action.

As I looked over at Jenny again, she was staring at the action, her mouth partly open. She glanced over at me and smiled, and then looked back down to our hands working on my cock. I looked down too.

That's all it took. I was ready to shoot my load.

I used my hand over hers to point my hard cock straight out from my body and down the hillside toward the landing.

"Ohh," I moaned as my orgasm started.

I continued to use Jenny's right hand to stroke my cock, as wave after wave of semen shot out, flew into the air, and fell down onto the hillside in front of me. Three or four large and long spurts were followed by a couple small ones, and then finally a small dribble as I stopped the stroking. The last of my cum rested on the back of Jenny's right hand between her thumb and index finger. It was a white glob.

"Wow," Jenny said. "I had no idea it shot out like that."

I was still breathing hard, and let go of her hand. Jenny slowly pulled her hand from my cock and stared straight at the small glob of white semen.

"It looks like melted pearls," Jenny said.

She stared at the cum some more, and then put her hand up to her face and stuck her tongue out. With the tip of her tongue, Jenny tasted my semen.

Jenny licked the small glob of cum into her mouth, tasted it for a moment, and swallowed.

"It tastes okay," Jenny declared.

She glanced over at me and smiled, then looked down at my cock.

"Looks like it worked," Jenny declared.

I looked down. My cock was deflated, but still fluffed.

"Yeah," I said. "Thanks."

"You're welcome," Jenny said. "That was fun. Let's go."

With that, Jenny went back up to the path. I followed.

We worked our way down the trail, talking quietly along the way. I learned a lot during that short walk. Jenny explained that she and her sister Carrie talk about everything. Carrie started fooling around with Jake two years before. Hand jobs and blowjobs. Then, the year before, Carrie got on the pill and started having sex with Jake. Jenny said she was shocked that we saw them having sex, because Carrie told her they were always very careful where they did stuff.

I asked Jenny if she liked giving me a hand job. She said she did. Jenny also said she didn't think that a guy's cum was gross, like some of her friends talked about. Her sister Carrie told her that she liked the taste of cum, so Jenny thought she would try for herself when a little of my semen was left on her hand. Jenny said she thought it tasted okay, but she was surprised how much shot out, and didn't know if she would want to take that much in her mouth, like her sister just had done.

Jenny did most of the talking on the way down. But near the end, I asked one question.

"Would you do that again for me sometime?" I asked.

Jenny paused.

"Yeah, I think so," she said.