Just the 3 of us

My mom and her new bf took me and my older brother. Us 14 & 15 camping. The bf had a daughter 15. Us kids were left alone at an isolated lake surrounded by rocks and pines while they went off and probably had sex.

For us kids there wasn't much to do but be together. The girl, Amber took an interest in my brother but Josh is real shy so she was the one making all the moves. She was always touching him. To make a long story short we built a fire on the shore at evening and Amber said we were going skinny dipping. By then Josh did anything Amber said.

I was nervous getting naked in front of my brother, but when I started to undo my bra Amber smiled and stopped me. When my brother turned around he was butt naked and us girls were still in our underwear. He was embarrassed but Amber made him stay that way.
She came over to me and undid my bra and began rubbing my nipples. My brother watched as she put her hand on my pussy and rubbed it more and more till finally I came. He didn’t know what to do or where to look.

That night we all slept in one tent. We both made him sleep in the middle and felt his body. It was awesome. After touching about everything else I squeezed his balls and whispered in his ear that everything was ok. It turned out good for him too because Amber jacked him off twice and the third time she told me to take over her hand was tired. It was the coolest thing my brother just laying there while I played with him and controlled his orgasm. At dawn we took him down to the lake and bathed him. By the time we finished the morning sun glowed on his skin. I never thought a boy was beautiful until then. We let him get dressed then hiked up to the cabin where mom fixed us pancakes. I couldn't take my eyes off my brother remembering how much fun I had.

When we got home we talked about it. Josh was still embarrassed but ok because I think he like being jacked off by two girls. After that I would sometimes watch him shower. He would still get embarrassed but would let me stay and sometimes I’d jack him off.