My 18 year old brother, Robbie, swam every day in our backyard pool during the summer of his graduation. He wore short, tight "Speedos" for a bathing suit, and watching him walk around in them was a real turn-on to me. He was staying out in the sun too much, I could tell and that wasn't good for his skin. I kept telling him that he needed to get some lotion on his skin, but he just ignored me.
One Saturday morning, Mom and Dad left for a two-day trip to a Family wedding, leaving the two of us alone. The first thing Robbie did was go upstairs and put on his swim trunks. He wore his usual bright light blue 'suit'. I wore my string bikini, and we met, back out to the pool.
"You need some lotion," I said.
He shook his head; "Naaa! - Stuffs for wimps!"
"You're going to burn, Robbie. You need something on you," I insisted and I caughgt him, stareing at my boobs under the tiny top.
"Ok," he suddenly said.
I went into the house and came back with some really strong sunscreen. I squirted a big gob of it into my hand as Robbie laid down on a towel on the concrete deck.
Robbie was a year younger than I was, and he was well-developed in the chest, stomach, and leg muscles. He went out for track and swimming, and was pretty good at most of the other sports at school too, even lined himself a "sports scholarship" for the fall of the year! - ME, on the other hand, elected to "fuck-off" for a year and have some FUN, then, returning to a "Community College" in winter for my B.A. degree.
I ran my hands across his shoulders as he lay there, thinking of what a strong, muscular back my brother had. Moving further down, I spread the sunscreen on his arms and the small of his back, rubbing it into the skin thoroughly.
Then, I came to his thighs. I moved down quickly to his feet, ignoring his thighs for the moment. I felt a slight tinge of excitement looking at his thighs, and at the outline of his balls nestled between his slightly parted thighs. I moved my hands up to his calves, massaging the ointment into the skin.
Then I moved up to his thighs, and looked inadvertently between his legs. The tight fit of the bikini bottom left very little to my imagination. I could clearly see the outline of his muscular buttocks, and between his legs, I could see the sac of his balls hanging there. His legs were spread just enough to make me want to see more, to spread them apart further.
The sight of the outline of my brother's balls was turning me on, I thought. I looked down at him. Such a sweet guy, so innocent, so muscular. My brother was a good guy, and a handsome guy, too. I loved my brother.
I worked my hands to his inner thighs, moving up slowly, all the way to his buttocks. Once, my finger came in contact with the bulge of his balls in that light blue bikini. He didn't flinch, didn't move.
"Turn over," I said, my voice not sounding like my own.
He turned over quickly, lying flat on his back. The first thing that I noticed was the enormous bulge of his cock in his bikinis. I rubbed his chest, moving down to his belly, glancing at the throbbing cock all the while. Then I moved down to his feet and up his thighs. I really wanted to just grab the damn thing and stroke it.
I was turned on. My pussy was wet and tingling, just from looking at that hard, throbbing bulge in his bikini bottoms. I glanced up and down the beach, then looked back toward the beach house. Mom and Dad wouldn't be back for hours, I knew.
I saw his cock jerk. Excited, I moved my other hand upwards and brushed against the fabric where it pressed the bulge of his balls. His breathing quickened. How he could simply lay there, I had no idea.
I felt him take a deep breath. With one swift movement, after all the arguments against the idea left me, I reached down and tugged at the elastic to his trunks. His cock flopped up and slapped him in the stomach.
He suddenly tilted his head, looking at me, and then rested again. "Ah," was all he said.
I gasped. I didn't expect the head of his prick to be so huge. It was shaped like a mushroom, and it had a tiny smear of sticky fluid right on the tip of it, where there was an elongated hole.