The brother and sister were Tom and Sue and we were all sitting at the side of the pool after our swim. When we were chatting together Tom said that as our parents weren`t with us we could swim in the nude. To that Ruth said that Fred and she had never been naked together, nor, of course, with Tom and Sue. She asked me if I thought we should swim naked and my reply was that it would be fun so we should do it.
With great daring (as far as my sister and I were concerned) we all took off our bathers. I became a little excited when I saw my sister and Sue completely nude. I hadn`t previously known that between their legs would be an area of dark hair. My eyes almost popped out at the sight of their lovely breasts.
Tom said "I`ve often seen Sue quite naked but never Ruth. I`m affected by it."
Sue chuckled and said "I can see how affected you and Fred are. Your pricks are growing."
"That`s true" said Tom. "How do you feel, Fred, seeing Sue and Ruth with nothing on?"
"I like it very much and hope that Ruth and Sue aren`t embarassed at seeing me naked."
"I`m not but what about you, Ruth?" Sue asked.
"Neither am I, but Tom said he`d seen you naked several times so I don`t suppose he`s embarassed at seeing me naked."
"I`ve seen Tom with his prick quite hard. You haven`t ever seen Fred naked before so you haven`t seen him with a hard cock. Would you like to see it like that?"
"Yes, I would, but what do you think about that, Fred?" asked Ruth.
"Well, I suppose it would be alright, but I`d have to stroke it to get it hard."
"Go ahead, then" said Sue. "Show us what it`s like when it`s hard."
Both Tom and I stroked our cocks and got them fully hard, at least as hard as a 16 year old boy can make it. I knew that I mustn`t continue stroking. When I tossed off (as I called it in those days) I would ejaculate something from my cock. It wouldn`t be right for that to happen in front of my sister and Sue.
"I`ve never before seen Fred and Tom naked and now I can see both of their pricks hard. I must say I like it. Can you make yours harder, Fred?"
"No."
"Of course he can`t," said Sue. "If he strokes any more he will cum. The same with Tom.