All the participants in his little tale are eighteen or older.
I lay there in the lower bunk listening to the rain softly patter off the window. My older brother, Cliff, was in the top bunk. We got along very well and I had agreed to come along on this trip because at last, I was eighteen and would be able to leave the family soon to go to college. This would be the last of my summer adventures with my family.
It was early evening and very dark. Only the reflected light from a far off camp lantern filtered through the rain and into the room. Mom and dad were in a bedroom on the other side of the big cabin.
I felt the frame of the bunk bed shift as Cliff climbed down.
"What now?" I asked.
"I've got to take a piss. You don't mind do you?"
"No."
"Do you want to watch?"
"Eww! Go away!"
Even in the dim light I could see that he was nude as he made his way to the bathroom. When he came back his cock was sticking right straight out. I heard him snicker as he waved it at me.
"I'm your sister for goodness sake. Don't be waving your dick at me."
"I'll bet you want to touch it, don't you?"
That jarred me because that is exactly what I had been thinking. I was a virgin and had never touched one of those things before but I was entirely curious.
Cliff stood by my bed. As if by its own volition my hand reached out and touched his cock.
"You can't tell much just by touching it. Why don't you wrap your fingers around it?"
Involuntarily my fingers closed around his member. It was hard and soft at the same time. I was amazed. I ran my hand up and down it. It had a big purple head with a dribble of something coming out.
"Eww, you didn't get it dry when you took a leak," I remarked.
"That's not piss, that's precum," he said.
"Just what the hell is precum?" I asked.
"It's the stuff that comes down the pipe when boys get ready for sex."
"Oh no! Does that mean you're ready for sex?"
"Yup. Would you like to try it?"
"Oh no I'm a virgin. It would hurt and I want to give it to somebody I love."
"Well I love you. Do you love me? What are you saving it for? Most girls get it popped in high school. Are you going to be an old maid?"
"No I'm not. Besides, you're my brother. It's not legal. I don't want to."
"If you don't want to, why are you still squeezing it? Take a little taste. I'm sure your girlfriends have told you a bunch of lies about sucking it."