Hiking With My Sister Takes An Unusable Turn Of Events.

Come Monday morning, Erin picked me up, and we drove to the site where we would be doing our hike; after finally reaching our final destination, it took a little quicker than expected to reach the lookout, a nice view over the ocean. We had some food and decided to head back; my sister mentioned a bush track that we passed almost back at the start; she said she looked at the track and said it was only a short walk that led to a beach. She said we should go there and go for a swim on this lovely day. Sound good, I said, as I was already wearing board shorts, just in case this happened. 

We got to the turn off, my sister just headed straight down, I questioned whether she was oblivious to the sign that said nude beach or not. I just kept acting dumb and pretended I did not see the sign. We got to the top of the hill facing the beach. We admired the view for a minute. I could make out at least one naked guy walking in the background, wandering if my sister noticed. She just said, "Well, looks like the way down is that way, let's go." We climbed down the hill through a small bush track. I was leading the way. I popped through the opening of the beach and looked around at the small group of naked people on the beach, “Oh my,” said Erin, who I forgot was behind me, not what I expected; pause for a second. I said to my sister I needed to sit down for a break so I sat on a rock and took a drink. “We are kind of here now,” said Erin as she looked back up the big hill. “I think we could do with a break before we climb out of here. What do you think, bro?" “I do need to rest my knee. A little sore. Let’s go over there and have a little break.”

As I slowly headed over with Erin following, we sat down for a little while looking around at the small group scattered on the beach, most of the old men were on the hill just peeking over, our way which was kind of funny and awkward at the same time. There were about  3 couples, two too far north of the beach and one just less than 30 meters away. They were a nice older couple, I admit I did find the older lady to have lovely breasts. "Feel like going for a swim, still, Brother?| "Yeah, thinking of it, I did not bring a towel, unfortunately, but a swim would be nice.| “Well, I guess we could blend in and join everyone, and it will save us from dealing with our wet clothes,” said my sister as she took her top off, and as she put her hands on her shorts, she was like, "Are not going to join me?" "Ok," I said and took my top and shorts off just as my sister took her bra off, I could not help but look at her breasts which I had not seen since almost 10 yrs back when we fooled around when we were still living at home together. I then thought stuff it and dropped my undies, now standing there all naked, while looking at Erin as she took off her undies. “Wow”, I said to her. “Sorry?” said Erin. "Didn’t expect you to be well smooth down there." Erin just laughed and said notice you try to keep it clean down there as well."  I try to trim it with an electric trimmer now and then.  I think we just stood there for almost a minute looking each other down, me trying to keep a certain thing down. Looking at my sister's body, who is almost just as tall as me, about a good 185cm, nice sporty PE teacher slim built, cute, average 38b breast, while I’m 6ft7, starting to let the love of beer take over. lol

My cock started stirring so I quickly sat down. We both started putting sun cream on ourselves when my sister asked me to do her back, which I gladly did; it started from the top and made my way down to her cute butt. By now, my 6-inch hard foreskin cock kept on bumping her butt cheeks. “Ok, let me get your back, bro." "Ok sister."

As I turned around, kind of awkwardly with my dick pointing in the air, the old couple not far from us kept looking back at me, giggling to each other. Every time my sister rubbed sunscreen down my butt and between my thighs, my cock kept twitching. "Thank you, sister; I might head down for a swim now," and I started awkwardly to wander down to the water with my hard cock swaying side to side.

I felt my cock almost start going down as my feet hit the water; I almost thought I was fine as I wandered deeper in the water, about knee-deep. When I felt my sister smack my butt and she leaned her head on my shoulder and whispered in my ear, "Would you like me to take care of that in the water?" My cock started growing to attention again from my sister's words. "Well, guess you're going to have to now," I said. 

We walked further in the water, a little more than waist deep, and Erin reached around and grabbed my cock; the feel of my sister's naked body pressing against me had my heart beat racing, as she started jerking my cock slowly and at the same time grinding her pussy on my butt cheek, almost like she was dry humping her own younger brother. In contrast, she stroked my cock, nice and slowly at first, teasing the tip of my cock; my body could not help but press back into her naked body, and I had both my hands grasped her butt as she started getting quicker and quicker.

Too fixated on my sister stroking my cock that I only just noticed a little splashing noise to the left of us; it was the older couple that was on the beach pretty much doing the same thing as us. They must have gotten too excited watching us from the beach, so they decided to join us. This got me even more excited that my cock started pulsating from my sister’s hand. When my balls started stirring, I whispered in my sister's ears, "I cumming." "MMM, yes bro cum for me, let me see your dick spurt into the ocean." My cock started pulsating more, my butt compressed into my sister's cunt, and all of a sudden I started shooting ropes of white stringy floating cum into the ocean.  "Mmm good boy, good boy," Erin whispered in my ear. She was just amazed by the white string of cum shooting out of my cock into the ocean.  

My butt compressed right into her cunt; I could just feel the warm feeling in the water from my sister's pussy. I noticed at that point, the couple next to me, the husband started squirming, "Looks like we set them off as well," my sister said as she giggled and slowed down the pace with my cock. We both looked at each other, my sister whispering to me that it was the first time she had seen cum shoot out of a cock into the ocean.

We just played around in the water for a little while and I noticed the couple and switch spots with each other. I did the same thing as I snuck up on my sister with my cock pressed between her butt cheeks, and I reached around with my hand to her, what felt a little warm in the water pussy, and started rubbing her pussy as her butt just compressed into my cock like she welcomed the feeling as I whispered thank you while slipping my finger into her pussy. We both just looked at the older couple who were looking at us doing the same thing; good chance they just thought we were just a cute young couple, obviously not that we were siblings, enjoying each other before we slowly headed back to the land for a bit of rest. With the naked older couple joining, we both gave compliments of each other's body and show. We chatted for a while, enjoying the ocean view before taking off.