I settled down and turned on the tv, but could find nothing worth watching. I thought about the events of the day, firstly my meeting with "the boy on the beach", and then wanking, with my sisters bra's round my cock. Just thinking about it all, started to get me horny again. I had cum twice, in the space of a few hours, but was still horny. I decided to get out of the caravan and go back down to the beach, as the weater was really good, and watching the sun set might take my mind off my horniness, so I got some beers out of the fridge and made my way back down.

 When I got to the beach, it was very quiet, there was nobody close to me when I sat down, but there were a couple of groups of people further along the beach. I could see my sisters in one of the groups, they waved to me as I sat down. I was onto my second can of beer, when Susan came over to me and asked if I wanted to go over to join them, I told her I just wanted to be alone, and after a few minutes, and having a can of beer, she left to rejoin the others.

When she had gone, I opened another beer, it was then that I noticed that where she had been sitting was slightly damp. I don't know why, but I leaned over to smell the damp patch, it did not smell of pee, so I presumed that she must have had a wet pussy, that had made her shorts wet.

The thought of my sister being wet, got me turned on so much, and it was not long until I was fully hard, making it obvious through my shorts. I was good that ther was no one close to me to see this. I tried to think of something else, but the thought of her wet pussy got me harder. I had another beer, hoping the effects would help to numb me, but it did not. I looked around to see if there was anyone close to me, there was no one within about 100 yds, so I put down my beer, and got my cock out of my shorts. I lay back, but kept my head slightly raised to make sure there was no one coming towards me.

I had been wanking for a few minutes, thinking about what it would be like to feel up my own sister, when I heard someone move behing be. I quickly stopped wanking and struggled to get my hard cock back into my shorts. I heard a voice asking what I had been thinking about, and asking if I wanted some help. I recognised the voice, but as I was slightly drunk, could not work out who it was. I assumed it was the boy from earlier. I turned to see who it was that had disturbed me.

I was shocked to see it was my sister, Morag. She moved towards me, and sat down next to me. I did not know what to say, the fact that I had been caught wanking by my own sister !!! Mo told me not to worry about her catching me, as she had seen me wanking before. I asked her when, I had always tried to be careful not to be seen by then at the house, she told me she had seen me wanking in the shower a few times, but the most recent time was when she had come back to the caravan earlier, to get some money, and she had seen me wanking with their bra's round my cock.

I went red, my cock started to go soft, but she then told me she had been turned on watching me. My cock started to get hard again, and I saw her looking at my shorts as my cock started to poke through them. I also saw that her nipples were hard. Mo asked if she could touch my cock through my shorts, I told her she could if I could rub her nipples.

She moved closer to me, and reached over to touch my cock, then told me I could stroke her nipples. They were so small, but so hard, and as I stroked her boobs, I could feel my cock get even harder. Mo then took off her top exposing her smallish boobs as she started to feel the full length of my cock through my shorts, and as she did, I saw her other hand move between her legs. She saw that I had seen this, and asked if I wanted to feel her up. She moved her hand away, allowing me to put my hand down to stroke her pussy, her shorts were wet, and she squirmed as I started to rub her pussy lips.

I felt her hand move into my shorts, and soon felt her hand on my cock, she asked if she could see it, and I slipped my shorts down, exposing my cock to her. Mo started to rub it then wrapped her fingers round my cock, and started to wank me. I tried to slip my fingers into the side of her shorts, but because they were tight, was unable to do so. She undid her shorts with her free hand, and pulled them down allowing me to feel her wet pussy. She was shaved, and really wet. She told me she had never been with anyone, and asked me to be gentle. I rubbed her pussy lips before sliding a couple of fingers inside her.

The fact that I was feeling up my sister, while she was wanking me, was so hot, I knew I would cum quickly, I told her this, she told me she was about to cum too, and a minute or so later she moaned as she came, I could feel her pussy tighten round my fingers, and then as she wanked me faster I could feel my cum starting to spurt all over her hand, her boobs and my chest.

She looked round to find something to wipe off my cum, but I told her not to worry, I took her hand and licked my cum off it, then leaned forward and licked her boobs clean. I was about to scoop the cum off my chest when she leaned over and licked my chest clean.

We both got dressed, and had a beer, it was then that Morag told me she had been dreaming about what had just happened, and a lot more, for a few years.