Karen reached the landing at the top of the stairs and hurried across to the bathroom, bare toes curled for traction. She hadn�t wanted to leave the den until the Saturday game on TV was at half-time, but she had been drinking iced tea steadily and now her bladder was so full she was getting a cramp. Just five more seconds. . . .

She yanked open the door and charged into the bathroom — and blinked at the dissipating steam, and at her older brother, standing naked on the bathmat, drying his hair with a big towel. Kevin pulled the towel back out of his eyes and returned her blink. Karen whimpered.

His eyebrows rose. "What the fuck. . . ?"

Karen half-crouched from the growing pain in her abdomen. "I gotta go, Kev! Mom�s in the one downstairs! Puh-leeeeeeeze?"

Her brother stared at her another second, then stepped back into the tub. He gestured toward the toilet. "Christ, go ahead. Don�t let me stop you."

She hesitated for a moment. Kevin expected her to pee in front of him? She felt a small stab of actual pain in her gut. Well, it was either that or leave again and make a big yellow puddle all over the landing. She pulled the door closed behind her and stepped across to the toilet, yanking her shorts down her thighs as she went. She flipped up the lid and contrived to push down her panties and bend at the waist and sit, all in one movement, in an attempt to conceal her crotch from Kevin�s view.

She glanced up as she released her internal valve and the urine began to cascade noisily into the bowl. God, what a relief! But Kevin was looking off toward the sink and slinging the towel over his shoulder to dry his back. He wasn�t sneaking a peek or anything. On the other hand, he hadn�t bothered to cover himself, either.

Kevin was twenty-one, eight years older than her, and he was an athlete whenever he could find the time. Karen admired his muscular chest and the shape of his legs, and he was even kind of handsome. But she hadn�t seen his penis since she was about three and Mom had made them change in the same cabana at the beach. She hadn�t really known what she was seeing back then, but she certainly knew now.

She lowered her gaze in growing confusion. It wasn�t her brother�s fault she had barged in on him and she could hardly expect him to leave the bathroom dripping wet on her account. He certainly wasn�t making any attempt to lessen her embarrassment, but she figured he was entitled to that small degree of revenge.

Karen had always depended on her big brother and he had, in fact, always been there for her. He helped her with schoolwork, patiently explaining stuff to her when she didn�t understand. He listened when she worried about things she couldn�t change. He reassured her after her adolescent sessions of staring at herself in her full-length mirror. In the five years since obtaining his license, he had been willing to drive her to her many after-school activities — gymnastics, soccer, dance — and wait for her in the parking lot afterwards. Sometimes, he even came and watched as they wrapped up practice on the beam, or whatever. And he had spent hours kicking a soccer ball with her in the field behind their house so she could practice her blocking.

Dad had died when she was too young to really remember him and Mom worked long hours, so Kevin had taken up the slack wherever he could. She had realized, after she got a little older, just how much of a crimp she had been responsible for putting in her brother�s own social life.

She remembered three years before, when she was twelve, there had been a monster storm one summer night. A decrepit old oak tree in their back yard had crashed down with a terrific racket and frightened the crap out of her. Without even thinking, she had jumped out of bed, run across the hall in just her tee-shirt and panties to Kevin�s room, and burst in without knocking. He was up on one elbow, the sheet around his waist, listening to the wind and the rain banging against the windows. Without a word, he had pulled the cover back, a silent invitation. Karen had gratefully dived into his bed and buried her face against his bare chest, trembling as his long arm encircled her and hugged her close.

As the storm began to move off, and the tumult lessened, and her heart stopped pounding, she had tried to explain to him how she felt, how grateful she was for his constant presence. How much she loved him. Kevin had stroked her long hair and told her he considered himself fortunate that he had such a great sister, and that he loved her, too. And then he had shooed her off back to her own bed and she had returned to sleep in a happy glow.

And now she was sitting here on the toilet, her shorts and panties around her ankles, trying to avoid staring at her brother�s cock, less than two feet away. She blinked as the yellow stream tapered off — Christ, she must have peed two quarts — and glanced up again. Kevin was drying his arms and watching her with an odd expression.

Karen made a clucking sound with her tongue. "No, but I almost did. I wouldn�t have banged in like that but it was really an emergency."

"Not a problem, babe. Besides, you�re old enough now to find out what a guy looks like."

Karen stared at him a moment, thinking about that surprising comment. Then, unconsciously, she dropped her eyes to his crotch. His penis was expanding, getting stiffer and beginning to stick out at an angle. She swallowed. Was she responsible for that happening? She did, in fact, know what a grown-up penis looked like — in theory. There were line drawings (though no photographs) in her Health textbook and she and her friends talked about the possibilities regarding the guys they were especially interested in, but her up-close-and-personal experience with such things was zero.

"It doesn�t bother you for me to see it, Kev? You�re not embarrassed?"

He laughed and set one foot on the side of the tub so he could dry his leg. "Guys don�t think that way. Being stared at naked by a pretty girl is not something I�m ever going to be bothered about."

Karen felt her face getting warm. As he moved, Kevin�s cock was bouncing and jiggling, and it was still getting bigger.

She cleared her throat, aware that she was still sitting bare-assed on the toilet, even though she was finished, and that this was becoming a very strange conversation. "So, . . . what does it mean when it does that? It wants something? Even though I�m your sister?"

Kevin paused and looked at her, then down at his cock, which was now rigid and nearly horizontal. "It�s a reflex thing, babe. Even though you�re my sister, yeah. My gonads know you�re a girl, and that�s all that matters to them." He grinned crookedly. "Don�t take it personally or anything."

"Anyway," he went on, "I�m curious to see how you�re going to finish up there without embarrassing yourself." He slung the damp towel over the shower curtain rod and set his hands on his hips. His cock was pointed straight at her face and Karen couldn�t take her eyes off it. She was having odd feelings about what could happen now, what she wanted to happen. Really, what she could make happen, when it came down to it. This was sort of an opportunity, but she wasn�t sure what to do with it. She trusted her big brother completely. He would never hurt her or take advantage of her. But maybe, just maybe, in these strange circumstances, she wanted to take advantage of him.

Without really thinking about it, Karen lifted her elbows from her knees and slowly straightened up. She lifted her eyes to her brother�s face as she tucked her hands behind her and leaned back against the tank. She kicked her panties loose and spread her knees apart a few inches. Her tee-shirt was cropped just above her belly button, so this exposed her abdomen and everything south of it.

"You can look if you want to, Kev," she said softly. "Fair�s fair. I�ve decided there�s nothing to be embarrassed about." She saw his eyes moving around and she saw him swallow. There were tiny sparks flashing in the back of her mind as she thought about what he was seeing. Her pale, fine blonde hair didn�t cover much of her, she knew that. And she kept it trimmed back in the summer anyway because of her bathing suit. So her pussy was probably open a little and her clit was probably showing. And Kevin was checking it out. And she found she wanted him to.

Her brother leaned over and pulled the tissue down on its roller, tearing it off and quickly folding it over in his hand. Karen watched him do it, caught by surprise. Then he bent over again, moved his hand between her legs, and carefully wiped her pussy with it. Karen caught her breath. He smiled and dropped the damp tissue into the bright yellow water between her legs, and depressed the lever. He straightened up as the toilet swirled and flushed.

"Your turn," he said quietly.

Karen stared at his face for several seconds, considering her options. Mom kept a very loose rein on their lives, largely by necessity. She almost never interfered with anything they did, she didn�t follow them around and poke her nose into things. Which meant the two of them were almost certainly safe up here in the bathroom. No one would disturb them. She could therefore do whatever she wanted. And it was becoming clear in her mind what that was.

Slowly extending her hand, she cupped her brother�s penis so it lay in her palm. After a moment, she curled her fingers around its length. It felt both hard and soft at the same time, like a steel pipe wrapped in sponge rubber. She moved her fingers a little, taking its measure, and it twitched in her grasp. She glanced up. Kevin�s lips were slightly parted and his eyes were half-closed. He kept very still.

Experimentally, Karen tightened her grip a little and slid her hand up and down the shaft a few times. A couple of her girlfriends had described this experience during sleepovers — bragged about it, actually. She liked the feeling, she knew that. This was sort of the focus of a boy�s being, she understood that well enough, and she had it firmly in her hand. There was power in that. Control a boy�s cock and you could control the boy. Most boys, at least, and at least part of the time.

Now what? she wondered. If she leaned forward only a little, she could put it in her mouth. But should she? Did Kevin expect her to? She didn�t want to choke or gag — that would embarrass her. But while she thought about the next step, her other hand had crept down between her legs without her even being aware of it.

Karen had been masturbating on a regular basis for a couple of years. Not all the time, she wasn�t that single-minded about it, but maybe once a week, when the pictures in her mind became too overpowering. Seeing certain boys at school in gym shorts with no shirt often led to her pulling down her panties in bed at night. She knew all that was normal, . . . but she didn�t think she had ever thought that way about her big brother while rubbing her clit and squeezing her nipples.

With her fingers in her pussy and her other hand stroking Kevin�s cock, she wondered how far she could go with this. How far did she really want to go? At that point, a small, urgent voice way in the back of her brain said, "He�s your brother!" She thought about that. This was supposed to be wrong, she was pretty sure of that. On the other hand, if she were to do this with some other boy, she wouldn�t know what his reaction would be. Some other guy might try to force her to go farther than she wanted to. Kevin, on the other hand, . . . Kevin would never do that. She was much safer doing this with him.

"Doing this." She thought about that, too. She really meant "jerking him off." She had never seen a boy have an orgasm, though she knew what it was supposed to be like — but again, only in theory. This might be her best opportunity.

All these thoughts had raced through her brain, piling up on top of each other, in about half a second. She decided not to worry about anything for the next few minutes, not to think about guilt or anything else, except what was happening right now, right here in front of her.

Leaving her clit to vibrate quietly on its own, Karen slipped her slender hand under Kevin�s cock and between his legs, and took a light grip on his balls. She ignored the quiet groan from above her. She was fascinated by the soft feel of these things. Like his cock, it was absolutely and completely outside her previous experience. She wondered how he could walk with all this dangling between his legs. She pressed them between her fingers just enough to make out the firmer center inside, like an egg yolk. She knew she could bring her brother to his knees in an instant with just a hard squeeze, but she would never do that. It was something to keep in mind, though, if she got into a situation with some other guy.

One of those whispered sleepover conversations suddenly came back to her. Debbie had been describing a date on which she had gone farther with a guy than any of their friends. But Debbie was also known to have gotten into the bookmarks on her father�s computer on the sly and wandered around among some very adult video clips, so Karen suspected she had actually made the whole thing up. Still, what she had described.. . .

Before she could change her mind, Karen released her brother�s cock and balls and, in a single movement, pulled her shirt and elastic sports bra off over her head and tossed them on the floor. Now she was as naked as he was. Before he could react, she grabbed his penis again and pulled it toward her. "Closer," she whispered.

Kevin braced himself against the tile wall as he hurriedly stepped back out of the tub onto the bathmat. His toes were only an inch from hers. Leaning forward, she cupped her breast in her free hand, lifting it and pushing her stiff nipple outward. She steered the head of his cock to it and rubbed it over the nipple, and the electricity it created made her catch her breath. Back and forth, round and round, she loved the feeling of her brother�s hard-soft organ rubbing across her breast. What would it feel like to rub it against her now-swollen clit? What would it feel like to spread her legs far apart and let him slide this long, hard shaft up inside her? She shivered. No, she couldn�t do that. There had to be a line and that was probably it. At least for now.

And that last thought shocked her a little. Was she going to go all the way with her brother one of these days? Christ, she had no idea. The way she was feeling right now, the way this tide of lust, or whatever it was, was rising in her gut, she gave no guarantees about her future behavior. Perhaps she was a natural pervert. Or else she was just really, really horny. But her brother wouldn�t force anything on her, she was sure of that.

She heard a low moan and tore her eyes away from Kevin�s penis as it continued its tour of her breast. She looked up as he swallowed hard. "Babe, . . ." he said in a low, warning tone.

She knew instinctively what that meant. But that was okay. That was partly why she was doing this.

Kevin set his hands lightly on her head and tightened his fingers a little in her hair as his cock jerked in her hand. His semen was a geyser of viscous white across her chest, tendrils of the stuff draped across her nipple. Another spasm and there were thin ropes of it at the base of her throat, oozing down her clavicle. It tickled and she shivered again. A third, smaller eruption and some of it began to drip from her nipple onto her thigh. She wrapped her hand around the base of his cock and worked it upward, squeezing yet more semen out the tip and onto her breast. She loved doing this. She had caused this to happen. Kevin had climaxed because of what she was doing. His cum belonged to her, and she found she wanted it all. She dragged her finger through it, smearing it across herself.

"God, Karen, I never meant for something like this to happen. I�m so sorry."

She looked up again at the anguish in her brother�s voice. "Stop it, Kevin," she said firmly. "Just stop it. Really. Neither of us intended for this to happen. But it did, and I don�t care." She smiled up at him and squeezed his penis, which was now losing its rigidity. "I don�t mind it at all. I really don�t. In fact—-" She squeezed again. "I liked it a lot."

Kevin just stared at her another moment, then took a deep breath. "Okay," he said. "Your decision, babe." He gave her that warm smile she so appreciated. "Not something I�m going to tell anyone about, though."

"Me, neither," she replied. "Our secret. Maybe there will be other secrets, big brother. Who knows, right?"

Copyright 2014 by Michael K. Smith. Copies may be made and posted elsewhere for personal enjoyment, but all commercial rights are reserved.