I’m going to preface this by saying this is not my blood related niece.

About 5 years ago I was on a family vacation with a large group. Mostly family but my niece had brought her boyfriend. He was a college athlete, 6’4” and was a pretty nice guy.

We had been on a lake all day and we had all been drinking including the younger couple. It was dark and we had just finished cleaning up after dinner. I had forgotten my keys on the boat so I went back out in the pitch dark. I was walking down towards the pier when I saw two dark figures on the boat. It was a pontoon boat so you could stand on it pretty easily and in the moonlight you could make out figures. I stopped because I wasn’t really sure what was happening, but I saw what looked like someone thrusting. I froze and actually hid behind a tree. After about a minute I realized it was my niece and her boyfriend on the boat. As I stood there watching I realized they were fucking! She was leaning over the edge of the pontoon on the bench and he was behind her just slamming her from behind. It was pretty quiet but if you’ve ever been on a lake you know that sound carries. I started hearing moaning sounds and cheeks slapping but it was pretty faint. I was tempted to get closer but there was no way to do it without getting seen. I stayed still and after a minute I could see them moving around and switching positions. She is actually a blonde and in really great shape and always wearing thong swimsuits and showing off her tight ass. I try not to look but it’s hard when her ass is just hanging out all day. Lol.

As they moved around I could tell that he had sat down and she had her hands on his knees facing away and was squatting up and down on his cock. They kept at it for a while and I just stood there stunned but also enjoying the view. She kept riding him for a minute then stopped and I saw her head go down towards his lap. I could hear her moaning as she sucked his cock and he came in her mouth. He grunted as he came and I stood there getting hard. I could see them moving so I headed back in the house not even remembering my keys. A few minutes later they walked in the back door and her mom asked where they were. She replied “just out for a walk” and adjusted her shorts. I’ve never told anyone about that but I still enjoy that memory from that night on the boat.

I knew she was horny but I didn’t expect to see that. I had seen her prior to that under a blanket before with her hands moving around on her crotch while her face got flushed so I was pretty confident she was touching her pussy but I never imagined seeing that.

Fun memory.

Feel free to message me if you have questions or want to hear more details!