Beth Ann sighed and wiped the long counter of the Hamilton Dry Goods store. Jake, her brother, was doing it again. He was in the back room jacking off, while she stayed out front tending the counter, not three feet away. As she wiped the counter, probably for the ten thousandth time, she could hear the rhythmic slap of his hand on his big angry looking boner - also probably for the ten thousandth time, she thought glumly.

"Would you hurry up, you pervert?" she hissed through the saloon doors that went to the back room. "I've got to pee!"

"Well then," he panted. "Go ahead and pee."

"You know I can't leave the front unattended. Aunt June would have a fit if somebody came in and there wasn't a Hamilton right there to do their every bidding."

Beth Ann and Jake lived with their elderly aunt and had for the last ten years, ever since their parents were killed in an accident. Aunt June was the only family they had and, while she'd felt it was her duty to take them in, she was also glad for the help they gave her in running her store. The fact that the store was out in the middle of Catlin County, thirty miles from just about anywhere, didn't mean business was slow. After all, everybody living within ten miles was also twenty miles from just about anywhere. So there was a fairly constant stream of folks coming in and out. But to make any real money, the store needed to be open about sixteen hours a day. Aunt June handled things from morning until suppertime, but after that Beth Ann and Jake looked after things until it was time to close. At least that's what they'd been doing ever since they'd turned twelve. At first it had been a wild adventure for the twins - being in charge of a whole store - but four years later Beth Ann felt like she could go anywhere in the place and find anything they sold blindfolded and hopping on one leg.

Beth Ann heard the combination sigh and groan she also knew very well. Jake was cumming, squirting two or three long white ropes of semen out of his penis and into a rag. Her nose caught the unique scent of his sexual fluid. That too was a smell she knew well. She wondered if all boys did that constantly, like her brother seemed to.

She thought back to the first time she'd seen him doing it.

Beth Ann had gone out to the storage shed to find a case of number six nails and was lugging it back into the back door of the store. She had the heavy box balanced on her shoulder, so she had a hand free to open the door. She knew Jake wouldn't be able to hear her from up front if she knocked, and that's where Jake was. Or at least that's where he was supposed to be.

But he wasn't.

Instead, as she walked up the dim hallway toward the front of the store, she saw Jake standing just inside the saloon doors, peeking out into the front room. His pants were on the floor in a puddle around his ankles. His hand was moving in what would be his lap, if he was sitting. Beth Ann hadn't understood at first.

"Jake? What are you doing?"

He'd turned and she'd seen clearly just what he was doing. They'd been thirteen at the time, and she'd known about reproduction and all that, but she'd never seen an erect penis until then.

Her brother's was, unknown to her, a prime example of a man's cock. It was about eight inches long, with a slight bend up and to the left. He was uncircumcised, which meant he didn't need any lubrication to jack off, and could do it anywhere, any time. Being a teenager, he could produce several ounces of semen a day. He'd learned how to get that semen out of his balls while taking a bath when he was twelve, and had been doing that just about every day since then. Especially when he saw Janet Thompson, who had just been in the store, buying the last of the number six nails for her father.

Of course Beth Ann didn't know all that at that time. All she'd known was that her brother had his hand on a very stiff penis and was slicking it back and forth in an almost professional manner.

Or had been.

When she announced her presence he'd jumped, then bent down and pulled his pants back up as quick as he could. He'd stammered out something about "just having to". Beth Ann had been pretty much speechless for half an hour, but eventually she'd confronted him about it. As they'd always been pretty close, Jake was actually able to explain about Janet, and what she always did to him, and how he relieved the pressure. Beth Ann knew what that feeling was like. There was one boy at school who, whenever he talked to her, made her stomach feel funny in a way that she just couldn't make go away.

But she'd never masturbated. She didn't even know how to begin.

In the years that had followed that incident, Beth Ann had begun to notice how girls affected her brother. If a pretty girl came into the store Beth Ann would surreptitiously peek at the front of her brother's trousers. More often than not a bulge would appear, like magic. And, when the girl had left, Jake would think up some reason why he had to go into the back room, or out to the storage shed, or to the bathroom. She couldn't go spy on him, because someone always had to be at the counter, but she was pretty sure she knew what he was doing. He was always in a great mood when he came back, with a big smile on his face.

It just wasn't fair. He got all the fun, while she just got frustrated. She didn't have a nice hard penis to play with. It had never occurred to her to explore her own body, to find out what might feel nice.

Things had progressed one warm evening when they were fifteen. Sandra O'Connor had come slinking into the store wearing a dress so old you could almost see through it, and had asked for a twenty-four inch zipper for her mother. Jake had told her that he thought there might be one in a box up in the attic and he'd have to show her. It wasn't until after they'd climbed up the fold-down ladder to the loft that Beth Ann had suddenly realized Jake hadn't been up in the attic for over a year, and wouldn't have noticed anything at all about sewing notions even if he had. AND, he'd had another of those boners of his as he led Sandra to the stairs. Jake was doing something up there with Sandra, and Beth Ann wanted to know what.

So she peeked. She quietly climbed up the ladder and carefully raised her head into the open space above. She almost fell off the ladder when she realized what she was seeing. Sandra was lying on the floor, with the skirts of her dress up around her stomach. Her legs were spread and Jake was between them. His pants were down around his ankles again and his pale white butt was bobbing up and down while Sandra sighed with pleasure. In the shaft of light coming through a dusty window, Beth Ann could see his stiff penis sliding in and out of Sandra's pussy. Her own pussy clenched as she stifled a gasp and she ducked her head back down instantly. He was FUCKING her! Right there in the store!

Beth Ann found she was panting, her breasts heaving like she'd run a mile. How could he do that right here in the store? And why would Sandra let him do that at all?

Maybe he was raping her! Maybe she needed help!

Beth Ann peeked back over the edge of the floor. Sandra was making noise ... moaning ... was that pain? Beth Ann examined the way Sandra was lying. Her legs were out flung, giving Jake plenty of room. Her arms were around him, not pushing him away. Suddenly Sandra began thrusting her pussy up at Jake as he pounded into her. She was chanting softly: "Yeah ... yeah ... yeah ... OH YEAH!"

Well, it obviously wasn't rape.

Then Jake started making noises too! He said, "You're snapping your pussy Sandy, I'm gonna cum Sandy ... here it comes, baby ... OH YEAH!" He stuck his peter in her all the way one last time and Beth Ann saw his ass cheeks clench. He pulled his prick out a little and slammed it back in, grunting. But while it was out, Beth Ann saw that his dick was coated with streaks of white and she knew it was his sperm.

He was shooting his sperm into Sandra O'Connor! She might even get PREGNANT!

Beth Ann climbed back down the ladder and went to the counter. Her pussy was hot and itchy. There was an ache in her stomach, not like she was sick, but like she was hungry or something. But she wasn't hungry. Between her legs felt ... wet. That had never happened before. She didn't know what to do about it. She felt nervous and jumpy too.

About then she heard noises of feet coming down the stairs. She made herself busy so she wouldn't have to look Sandra in the eye. When Sandra and Jake came back into the room he said something lame about how since they hadn't found what she needed that they'd have to order it in. She giggled and said to give her a call when it got here and she'd run right over to get it.

She'd confronted her brother after Sandra had left the store. A shouting match had ensued but Beth Ann ended it by saying that if he ever did anything like that again in the store she'd tell their aunt. Jake had clamped his mouth shut, but later he whined and moaned that he'd get the blue balls if he couldn't do something to get some relief. In the end he'd gotten her to agree that he could go in the back room to jerk off when he needed to, as long as he didn't take too long.

Beth Ann had thought that he'd be too inhibited to do it very often. She was wrong. Jake could whack off six or seven times a day if he wanted to. And since it was his sister who'd stopped him from having REAL fun he didn't care if his sister saw him or not while he was spanking his monkey. As time went on he even quit trying to be private about it, standing in plain sight as he jerked on his hot meat until it spat streams of semen up into the air. When Beth Ann complained that he was making messes on the floor, he started shooting into a rag again. As time went on, Jake not only didn't mind if his sister saw him, it made him even more horny to know a female was looking at his dick. So he ended up standing right inside the saloon doors so that if Beth Ann went in there she couldn't help but see him.

He thought it was funny. She was even more disgusted.

Things went along that way until Beth Ann refined her interest in boys. When Roger Dalton asked her to a school dance, and pushed her into a corner where he commenced to kiss her until she pushed him away, she found herself feeling exactly the same way she had felt when she saw Jake and Sandra fucking. Was that what Roger wanted to do with her? She let him kiss her some more, but when his hand cupped her breast she pushed him away again and went back out in the light, where people could see her. But every time she danced close to him after that, her stomach did flip flops.