You'll Live to Regret It 
by Musclehead



"I'm telling you, Nick, you really don't want to get involved with Brianna."
Penny was trying to reason with her older brother, who was home from college
for the summer. Nick hadn't been around during the summer months since he had
graduated from high school, always finding a summer job near the campus. But
times were tough and he had come home that summer before his senior year,
since no work was available.

"But she's so hot, Penny."

"Yeah, and she's got just about every guy in the school lusting after her.
What makes you think you've got a chance?"

"Thanks a lot, sis. I'm not so bad, and I'm sure she'd be flattered that an
older guy was interested."

"Well, she's mostly interested in jocks. She's really into fitness and health
and all that."

"I'm fit."

"Not like her. She works out almost every day and she's really competitive."

"I don't have to work out. I'm not fat or anything."

"Man, do you have a lot to learn."

"Well, if I get a chance, I'll ask her out for dinner. Doing that'll show that
I'm a little more sophisticated than what she's probably used to from high
school guys, especially jocks."

"Okay, but you'll probably live to regret it. Don't say I didn't warn you."

Brianna was Penny's best friend and Nick had seen her only when he was home
for winter break or Thanksgiving during the last year or so. He assumed that
she had come to live in their town just recently. In a day and age where most
girls with nice bodies always had some skin showing between the tops of low
cut, skin tight jeans, and whatever shirt they might be wearing, Brianna
always wore clothes that showed off her great body without that fashion
trademark. And on this night early in the summer it was cool out, and since
they were going fancy restaurant, she wore a dress. So all Nick could see were
some great calves and some nice cleavage.

They hit it off right away and had a very nice time. As beautiful as she was,
and with that great body, Brianna was not at all snotty, and even though, as
Penny had said, she had every guy in the school chasing after her, after one
date, she seemed to prefer Nick over those immature high school boys. She was
very nice and Nick couldn't help but wonder why Penny had warned him about
dating her.

Their second date was a little less formal. She wore her usual tight jeans and
baggy sweatshirt, but it was still obvious that her breasts were as nice as
that tight round ass. Nick really wanted to get into those pants, but he
played it cool, not wanting to scare her off. After all, she was five years
younger than him, and even if she did have guys chasing her all the time, she
still couldn't be too when it came to sex.

Inevitably the subject of health and fitness came up. "I had noticed, Brianna
that you eat very healthy."

"Food is fuel for your body. And if you love your body you won't put poison in
it."

"Well, I certainly love your body."

She blushed. "Thanks, but it didn't get this way by accident. I eat right and
I exercise almost every day. What about you?"

"Well, I do eat right, but I don't seem to find the time to exercise every
day, but I do work out," he lied. "And I guess I'm kinda lucky in the genetics
department. I don't seem to get fat. Penny's lucky that way too."

"But she exercises too, you know."

"No, I didn't."

"Maybe not as much as me, but still, she's very fit. And I guess I'm kind of
lucky in the genetics department too. Anyway, a person shouldn't find the time
to exercise, they should make the time to exercise."

"In what way?"

"What?"

"Like you said, in what way are you lucky in the genetics department?"

"I'll show you some time. Hey, I got an idea. Next time we get together, why
don't we exercise together? You said you do work out, didn't you?"

"Well, ... yeah. That'll be great."

Over the next few days, Nick had these fantasies about working out with
Brianna and her maybe wearing a sports bra and maybe some skimpy running
shorts or those tight biking shorts, or maybe some yoga pants. So he was
somewhat let down when he showed up at her house and she was wearing baggy
sweats. But he didn't let is disappointment show.

Brianna led him out to the three car garage behind the house. "Since this is
my exercise area, can I sort of lead the way?"

"That's fine with me." Other than mats, there were some jumping ropes, a
balance ball and medicine balls plus a chinning bar, but that was about it. So
they worked out for about a half an hour, just calisthenics and stuff. By the
end, Nick was clearly dragging. "Wow. That was a tough workout. You're really
fit."

"Thanks, but that was just the warm-up. Are you ready to start the workout?"

A stunned Nick managed finally, "Maybe I'm not as fit as I thought. I'm
completely drained."

"That's what I thought." She paused for a moment. "I feel like you mislead me.
Nick, I don't think I can date someone who can't keep up with me. Maybe you
should go."

A clearly hurt and dejected Nick slowly walked towards the door and then
stopped, turning around to face her. "Brianna, I really like you a lot. I
guess I didn't realize that you were at such a high level of fitness. I never
realized that women could be fitter than men. Can we give this another
chance?"

"I like you too. I'll tell you what. You don't need any equipment or anything
to do the routine that we just did. Why don't you do this at home for say a
couple of months and then we'll give it another shot, okay?"

When the bummed out guy came through the side door into the kitchen in their
house, Penny was standing at the counter with her back to Nick, making a
protein shake. Unlike Brianna, Penny liked exhibiting her body. She was
wearing the kind of outfit that Nick had been hoping to see Brianna in. When
she turned around, he was kind of taken aback. He hadn't seen his sister's
body with little clothes on since back four years earlier. She still had a
little girl's body then, and even though she was thirteen, but she hadn't
started to develop yet.

But her friend, Sheila sure had. And being an obnoxious high school senior,
not able to admit that he had the hots for his sister's friend, a seventh
grader, so he just acted like a jerk, picking on both of the all the time.
Anyway, back to the present. Penny's body was all woman now, and the horny
Nick had to remind himself that this was his sister standing here in front of
him in a sweat soaked sports bra and some soft, tight, cotton gym shorts
rolled down a few times like teenage girls like to do when they have great
bodies. Her tummy was flat and firm and her tits really stuck out. Her arms
had no visible muscle but were toned and shapely, but her legs were very
shapely and obviously the product of some kind of exercise, probably running,
he thought. In reality her legs and firm butt were the product of squats as
well as running. It really didn't quite dawn on Nick how fit his sister was,
but he knew she sure was hot.

"Ha, ha, you look pretty bummed out. I told you you'd regret asking her out.
What happened? Did she tell you that you were a dweeb and that she was out of
your league?"

"No, nothing like that. And you don't have to be such a bitch about it."

"Sorry. ... .. So what happened?"

"I worked out with her and I couldn't quite keep up. She told me to do the
workout that we did for a few months, then come back and exercise with her
again. I never knew women could be so fit."

"Man, what rock have you been hiding under? Women can not only be fit, they
can be strong."

"Maybe, but not like a man."

"You're an idiot." She walked over to the kitchen table and sat down. Nick
couldn't help but notice what a fine ass she had as she crossed the room. She
looked over at Nick then put her elbow on the table her forearm up and her
hand open. "Come on."

"What?"

"Let's arm wrestle."

"You're joking, right?"

"No, I'm not. Are you scared?"

"Of course not. I'm five years older and three inches taller than you. Plus
I'm a guy."

"Well then, you should kill me, right?"

He went over and sat down across from her, then put up his arm. It was at
least two inches longer than hers. "Hang on, Nick." She got up and went over
to the desk that was tucked into a cubby hole. While she gracefully moved
across the room, Nick noticed that he was getting a chubb staring at her great
body. He had to remind himself that this was his sister, god damn it. Penny
grabbed a telephone book before returning to the table. Placing it under her
elbow, their hands were now closer to even.

Locking up, Penny smiled at her brother. "Say go whenever you're ready, Nick."

"Go." He thought he had the element of surprise, saying go as soon as she told
him to, but nothing happened, she didn't budge as he poured on the pressure.
Looking down at her arm, there was a bicep there where before it had just been
a nice, shapely arm. It was not huge, but it was bigger and firmer than his.
He looked back up into her knowing eyes.

"I see you just noticed my muscle. Did you notice anything else?"

"What?"

"Well, you're right handed and I'm a lefty. So we're doing this with what
should be your stronger arm and with my weaker one." She stopped talking and
stared at him for a second. Then she slammed his arm down onto the table so
quickly and easily it was as if he was putting up no fight at all. She got up
and went over to the counter, grabbed her shake and sauntered out of the room
as he stared at that perfect round ass, suddenly involuntarily ejaculating in
his shorts as she called over her shoulder, "You'd better start working out,
weakling."

Over the next few weeks, he worked out like a mad man. He got really sore at
first but as time went on, it wasn't so bad. There's a saying that after four
weeks of working out, you'll start to notice changes in your body. After
eight, your friends will start noticing and after twelve the world will
notice. I t had been four weeks and Nick was seeing those changes. Since Penny
had an interest in what was going to happen eventually between Nick and
Brianna, her curiosity was piqued and she was noticing the changes too.

He had decided that he wanted to be more fit than just being able to do
Brianna's "warm-up" so Penny had given him some other stuff to do as well. He
was feeling pretty good about himself and was going without a shirt sometimes,
not ashamed of his body any more. One afternoon he was out by the pool Penny
came out. She was wearing a tiny bathing suit and with his newfound
understanding of what being fit was all about, he could see that she actually
was pretty impressive, and hot. And now he could see that those beautiful
shapes were actually well developed muscles, even if she wasn't overtly
muscular. He hated that his sister turned him on, but he rationalized it by
acting as if he was simply impressed with her fitness level.

After she commented that he was looking a lot better, and that he was actually
starting to show a little definition, even if it was on a somewhat thin body,
he decided to show her what he could do. He dropped down and did forty
pushups. "Not bad, Nick. You've worked really hard."

"Thanks. Are you ready for a re-match?"

"What? Arm-wrestling?"

"Yeah."

"I guess so, if that's what you want."

So they squared off. Clearly stronger than a month prior, Nick was doing much
better, and had the back of Penny's hand only inches from the table before she
once again slammed him the other way with such power that he almost fell off
the bench. She smiled at him and then dropped to the deck and did forty
pushups, forty one-armed pushups.

Even though he was thoroughly humiliated and embarrassed, he was resolved to
work out even harder. Somehow in the back of his mind he was figuring out that
if Penny was so frickin' hot from working out and being strong and fit, and
Brianna worked out more than Penny, then probably she'd be even hotter, and
since she wasn't his sister, it would be okay to be totally turned on by her
body.

Finally after two months, Nick beat Penny at arm wrestling with his weak arm
against her strong one. "You've come a long way, Nick. I'm proud of you. I
already told Brianna how well you've done, and she's anxious to see you again.
But I suggested that she just come over on Sunday afternoon for a swim instead
of you going over there to work out. Mom and Dad won't be around so it'll just
be the four of us."

"Who's the fourth?"

"Pete. My boyfriend."

Pete got there around noon. He was about the same height as Nick, about
five-ten, but was about fifteen pounds heavier, with some muscle. He and Penny
were quite a good looking couple, very fit and full of energy. Brianna arrived
about a half an hour later. When she removed her cover-ups poolside, Nick's
jaw just about hit the deck. What Pete was to Nick, Brianna was to Penny.

Noticeably muscular, she probably weighed about ten pounds more than Penny.
And even with those muscles, she made the very hot Penny look like a little
girl next to her, in spite of the fact that she was wearing a pretty modest
two piece and Penny was wearing a much more revealing swimsuit, mere patches
of material here and there..

And just as Penny had said, Brianna had quite the competitive streak. So they
had little contests all afternoon, swimming, diving, pushups, you name it.
Finally Penny suggested a sort of round robin wrestling match. "Pete and I
wrestle all the time, Nick, it's a real turn-on," she whispered in her
brother's ear. "Maybe if you and Brianna wrestle, it'll get her turned on to
the point where maybe she'll have want to have sex with you. That's what you
want, isn't it? God, look at her body. She turns me on, so she must be turning
you on."

She laughed as she got up and moved to the grass. "Me and Nick first. Sibling
rivalry." They wrestled hard, to a draw. Then Pete and Brianna wrestled. Nick
was amazed at how well she did, considering the size advantage he had. He beat
her, but he couldn't pin her. Nick could tell that she had done some wrestling
before and since he never had, she might have a bit of an advantage there when
they would finally get around to it. Still, Nick reminded himself that he was
bigger and way fitter and stronger than he had been two months before.

When Penny surprised Nick by beating Brianna in spite of the fact that Brianna
showed more muscle than her, Nick felt more confident about himself,
remembering that he could now beat his sister in arm-wrestling. Nick was
brought back down to earth when Pete pinned him in about thirty seconds,
remembering that he couldn't pin Brianna even after ten minutes.

After a bit of a break, finally, the big moment arrived and Nick was going to
get to put his hands on that luscious body. As Brianna got out of the chair
she was sitting in, her suit caught and tore. Looking down and seeing that her
bottoms weren't going to stay on in a wrestling match, she excused herself to
go change. "I brought another suit." As she went into the house, she scooped
up her cover-up.

When she came back out, she was wearing the cover-up again. As she approached
the lawn, Penny got up and turned to Nick. "I want to tell you something
brother before you and Brianna wrestle. Last week, I let you beat me in arm
wrestling, I'm still way stronger than you. I could beat you in my sleep. And
as to me beating Brianna here in wrestling a little while ago, well, I don't
stand much of a chance against her. She's way stronger than me and a superior
athlete to boot."

Now Pete chimed in. "You know buddy, a weaker opponent can beat a stronger one
if they're quicker and more skilled, but when someone quicker and more
skillful one, as well as being a lot stronger, they're pretty unstoppable.
That's Brianna here."

"But you beat her."

"She let me."

"Why? What's going on here?"

"You've been set up, brother. I'll explain. I know you think Brianna here is
new to the neighborhood, but she's not. She lives in a different house now
than when we were growing up, the one you went to that night when you worked
out with her, but her family has been in this neighborhood since we were
kids."

"I don't recognize you."

"My face has changed a lot in the last few years and I used to have really
long hair."

"But I don't know the name either."

"Brianna is my middle name. I like it better so I started using it."

"Dear brother, you might remember her as Sheila, my friend you used to pick on
all the time but we all know you had the hots for her because she had those
great tits when she was only thirteen."

"And now I have the muscles too." She dropped her cover-up at her feet. She
was wearing one of those slingshot bathing suits that cover almost nothing of
her absolutely flawless and spectacular body. It was hard to believe that she
was only seventeen. Every muscle was as perfectly developed as it could be,
not too big or bulky, just a body as functionally fine-tuned for performance
as a body could get.

"Like I said, in addition to working out like a maniac, I've been lucky in the
genetics department as well. And Nick, there's an old expression,' paybacks
are hell'. There's also another one that we competitive people like to use,
'Don't just win, dominate.' Get ready to get dominated."

And dominate she did. She was so and in such control of her body that he
looked not only clumsy compared to her but he looked like he was going in slow
motion as she made one move after another with lightning speed. And she was so
much stronger than him that she could do anything she wanted to him and he
could do nothing to stop her.

To say she dominated him was an understatement. Her superiority was almost
beyond belief. The most awesome things though were when she would do flipping,
spinning body-slams, showing a unique ability to whip her body at the end of
each move, making the landing even more intense and painful for poor Nick, her
hard body slamming down on top of him with stunning force.

At one point while he was still coherent, Brianna was sitting on his face, the
bottom of her slingshot pulled to the side, shoving her pussy against his nose
and mouth, he looked up above him at those amazing breasts pushing what little
bit of fabric there was away from the rest of her magnificent torso. Then he
heard his sister's voice, almost swooning as she came over, pulled the straps
away and started licking and fondling Brianna's tits right in front his eyes.
As the dual stimulation sent her over the top, Brianna bounced up and down on
Nick's head so hard that she knocked him out.

When the thoroughly beaten up Nick woke up, he was on the chaise lounge with
an icepack over his forehead, his body feeling like it had been in a car
accident. He slowly opened his eyes and looked over at his sister. "She's
gone. I told you'd live to regret ever getting involved with her. When I told
you that she was interested in jocks it is because she loves to put those
arrogant assholes in their place. She lives for it. You showed the same
stunningly ignorant attitude about what females are capable of now that the
constraints of society have been lifted from our shoulders, plus she
remembered how relentlessly you picked on her when we were kids, so for you it
was a double whammy."

Before he could respond, she continued, "You'll be alright, ... .. eventually
... ... in a few weeks ... ... .maybe."

She got up and started to walk away, then turned back. "You know Nick, while
she was beating the crap out of you, you had a boner the whole time. I don't
know if you were getting off on the hotness of her perfect body or the fact
that in addition to being so hot, she's the perfect fighting machine, but I
think you like that she was so much stronger than you. I think you even came a
few times while she was twisting you into a human pretzel."

"By the way, you know how easily Pete beat you? Well I can beat him just as
easily. I'm no Brianna, and my muscles don't show as much as hers, but I'm
much stronger than I look. And I love to wrestle. I also love to have my pussy
licked, and I make Pete do it after I beat him. I beat him every time. I'll do
the same with you. I know you're my brother, and it might seem kinky, but it's
not like we'll be fucking, it'll just be you servicing me. It'll be great
having someone right under the same roof so I can get licked whenever I want,
and quite frankly, sometimes I like it several times a day. So, heal up
brother, and keep in mind that you also used to pick on me relentlessly.

I gotta go now. I told Pete to wait in my room for me. As she walked away,
Nick heard her say under her breath, "Don't just win, dominate. Yeah, I like
that. "