There was absolutely nothing to do in this small town our parents moved to in the middle of nowhere. Even the internet and phone service was unreliable, making sitting around the house so boring. About the only thing there was for my kid brother, who was three years younger, and I to do to entertain ourselves was the beach on the lake on the far side of our parents property. It was close enough to walk to but separated enough from everything by the copse of trees you had to go through that it gave a real sense of privacy.
One day, while I was swimming, enjoying the cool crisp water, and he was sitting on the sand watching me, an idea came to mind. Had he ever seen a girl naked before? I thought that I would play a naughty prank on him. As a horny teenage girl, especially one living here in this town where prospects for boys were very limited, the temptation became irresistible to have a little fun and gauge his reaction.
As I walked out of the water, I reached behind my back and untied the string holding up my bikini top. It fell free and a smirk spread ear-to-ear on my face. I was far from the most developed girl, but there was enough to my perky little mosquito bites that they could jiggle ever so slightly as I strode topless up the beach with a deliberate sway of my hips.
If he had looked away or complained, or even got up and ran, that would have been the end of it, but he didn't, just sitting there stunned as I closed the distance. He was just old enough to be getting out of the 'girls are icky' phase. His eyes were mesmerized and there was a definite sign of natural interest forming in his shorts.