Linda and I went to the nudist beach every morning after breakfast, partly so we were not letting Mum and Alice know that we were at it like Rabbits, but we also quite enjoyed seeing all the naked bodies. Linda liked looking at all the Big Hard cock's, I liked seeing her get excited as I knew I would be getting great sex later. On about our 2nd day there, we saw a group of teens, they looked like they were about 16. The 2 guys were hard, this got Linda wet, and she could see me getting hard looking at them. They were all naked, then they saw us looking at them and came over to join us. 

We all started chatting, it turned out that they were from 2 families, their parents were "away shagging". Linda started to explain how we had been having sex together for about 2 years, they turned and asked what was wrong with that? Linda went Red and looked at me, I put my arm round her, and said that the only unusual thing was, that she was my big sister. 

Initally they looked shocked, but then one of the guys said he had been fingering his sister for a while, then it was her turn to go Red, as she went on to say that she had been sucking him off too. By now, me and the other 2 guys were so hard, our respective sisters started to wank us off. I really enjoyed watching them both getting wanked, I knew it would not be long till I came, Linda also knew this, so started to suck me as I finger fucked her. Soon the 2 guys were getting sucked too, by their friends sisters. I soon filled Linda's mouth with my cum, she swallowed the lot. The 2 guys soon came too, but only came over the girls faces. The girl said they did not really like the taste of cum. 

By the end of the holiday the 2 of them would be drinking cum from anywhere they could get it. We met them a few times, but never interacted, the girls seemed too slutty for us to get involved with.