You'll Live to Regret It, Pt. 2 
by Musclehead



While Nick was experiencing some relief that he didn't see Brianna for the
rest of the summer, it really didn't matter. Penny was quite capable of making
her brother's life a living hell. No, she couldn't throw him around or slam
him with teeth-shattering intensity like Brianna could, but she could still
put plenty of hurtin' on him. Brianna had gotten her payback for Nick's
behavior, and Penny had endured a whole lot more than Brianna had, so
obviously there would be more payback.

He was working out like crazy trying to catch up so he could at least defend
himself against his sister's daily assaults, but she was just too far ahead of
him in both fitness and physical strength, not to mention that she was a very
good athlete and Nick, not so much. Every encounter would end the same way,
she would wrestle him into submission and then force him to service her
orally. And she didn't care whether he actually submitted or not, she would
just force him into position to do her bidding.

The worst experience was the weekend before he went back to school. Penny and
Nick's parents were away for the whole weekend and by the end of it, Nick was
so sore he could hardly get out of bed. Penny was right. She loved to wrestle
and she loved to get her pussy licked. The most humiliating of a bunch of
humiliating encounters that weekend resulted from Penny ripping Nick's clothes
off and then laughing derisively when she removed hers and his bad boy sprang
to attention.

"So, your own sister turns you on, pervert."

"What are you talkin' about? You force yourself on me daily. That's not right
between brother and sister."

"I'm only using your face, not your dick."

"It's still wrong and perverted."

"Are you calling ME a pervert as you stand there with your boner while you
stare at my beautiful athletic body?

"I guess I am."

Penny flew into a rage, really a mock rage since she had intentionally goaded
him into his remark. But she used the moment to really open up a can of
whoop-ass on poor Keith and while she was grinding her pussy on his face, she
once again had a good laugh as she felt hot spurts spraying her back, even
though she had Nick's arms tucked in the folds of her legs. "Ha, Ha. Your own
sister turns you on so much that you came without even touching yourself."

The next morning, Nick snuck out of the house early and headed back to school.
Even though he couldn't move into his apartment for three more days, having
sub-let it for the summer, he thought that sleeping in his car, if necessary,
would be better than enduring another moment of suffering at his sister's
hands. When he got back to school, he went by his place to tell the renter,
whom he had never met, that he was back and asked if he could park in the
parking lot for the next few days.

She was very nice and wouldn't hear of him sleeping in his car and told him he
could stay in the apartment. She was attractive, but nothing at all like
Brianna or his sister who were so obsessed with being hardbodies. They wound
up making it that night and he found himself not super aroused by her, and
thinking about how much better it would have been if she was really fit. Not
that she was a slob or anything, she was just kind of average in that
department.

As he lay in bed afterwards staring up at the dark ceiling, with the woman,
Shelley, sleeping next to him, he found himself thinking about Brianna,
awesome Brianna, and unfortunately, his sister, who was also pretty awesome.
"Damn it", he thought to himself as a picture of her naked body came into his
head and he was instantly erect, "maybe I am a pervert after all."

He decided that he needed to pursue that kind of woman, the fit, athletic, and
yes, strong kind of woman. Other women didn't measure up any more. But he also
vowed that night that he couldn't let his sister use him as her personal
whipping boy any more, nor could she abuse him for her feral pleasure. He must
do something to level the playing field, so to speak.

A couple of weeks later, Penny had just finished working out and was wearing
her usual sports bra and running shorts and looking very hot, when she saw the
UPS truck pull into the driveway. A kind of nerdy looking guy, who looked a
few years older than her, maybe early twenties got out. He was carrying a
heavy package and heading towards the front door, obviously struggling with
its weight.

Deciding to have some fun at his expense, she quickly headed towards her
bedroom. When she answered the door, she was wearing a tight tanktop, cut off
to show off her beautiful torso, and some booty shorts. She was sooo hot, and
she knew it. Since she was still sweating from her workout, the shirt clung to
her beautiful breasts and buff upper body and her fiery red hair was also wet
from sweat, matted and disheveled. As she opened the front door a rush of cool
autumn air caused her nipples to immediately stiffen.

The delivery man was so taken by this amazing creature in front of him that he
almost dropped the package he was carrying. He didn't know where to look
first, those beautiful breasts, that flat firm stomach, which was showing more
definition every day, or those sculpted arms and shoulders, not to mention her
shapely muscular legs. She smiled at him, taking the package from him and
holding it without a problem, something that did not go unnoticed by the
driver. "Be careful Miss, it's heavy."

"Thanks, but I seem to be handling it quite a bit more easily than you did."
As she set the package aside, she continued, "You'd think a man who lifts
packages all day would be stronger than a mere teenage girl, but jeeze, I'm
probably twice as strong as you." As she talked she moved closer to him until
they were eye to eye, their noses almost touching, her full breasts pushing
against his sallow chest. He was trembling. She reached out and gently brushed
her hand against his crotch. The poor guy shuddered and came in his pants, his
legs buckling as she stepped back and shut the door, giggling to herself,
basking in the knowledge that she could have this kind of effect, this much
sexual power over a man, not to mention the obvious physical power.

Looking over at the package, she muttered, "Well, what have we here?" The
package was addressed to Mr. Nick Adams. The return address on the UPS label
said, Muscle Force,Inc., and under the address was a logo "For Powerful
Results Quickly." She opened the package and there were a couple of medicine
balls, hence the weight, and some bottles of supplements, plus a fitness
guide. "I guess Nick wants to see if he can catch up to me so he can defend
himself a little better."

In the meantime, back in Collegetown, Nick and Shelley were quickly becoming
an item, in spite of the fact that she was not his physical ideal. He decided
that there was no need for her to move out. One evening she saw him looking at
some fitness websites, and instead of being annoyed, she decided that she
liked the look of the women she saw on the sites and she decided she wanted to
try to look that way. It was easy enough for Nick to get her to join the gym
with him, the back of his mind fantasizing about actually living with a
beautiful, fit woman who didn't have an attitude about putting guys in their
place the way Penny and Brianna did.

And it was fully in his plan to never allow his sister to do it again either,
beat him up, that is. As to Brianna, he doubted if he'd ever be able to equal
her, so he just figured he'd avoid her if he went home for a visit. At any
rate, he was starting to be a little troubled that his package wasn't
arriving. He called Muscle Force, Inc. and was horrified and angry that they
had shipped it to his home address. The anger subsided when he realized that
it was his fault, but now he had to figure out how to get it.

No problem, he'd just ask his Mom or Dad to send it on. But they told him they
hadn't seen it and had also asked Penny, who said the same thing. He called
back to the company to find out if it had shipped. The dispatcher called him
back a couple of hours later. "Hey buddy, I don't know what's going on. I know
that they drug test all employees at UPS, but they told me that the driver
doesn't remember whether he delivered the package or not, and he's been
walking around in a daze ever since the day it should have been delivered.
They said he has no signature from anyone and just keeps muttering the word
"incredible" under his breathe. They had to let him go."

Nick wasn't too concerned about the medicine balls, or even the fitness guide.
It was the supplements he was after. But you had to buy the whole package in
order to get the supplements and he had very little extra money to purchase
the whole thing again. He wondered if the UPS guy had stolen them.

Over the next few months, Nick and Shelley were at the gym five evenings a
week. Well, not exactly. Shelley was there five nights, and sometimes putting
in an extra daytime workout or two as well. But Nick's caseload as a senior
pre-law student kept him busy studying and he was only getting to the gym
three or four times a week. Still, he was doing pretty well, steadily getting
stronger and fitter as time went by, and at this point was sure he was as
strong as his sister.

Needless to say, with only a part time job, and much more time to work out,
Shelley was making more progress than Nick, and after a lifetime of not doing
much other than some occasional running and aerobics, a previously
undiscovered aptitude was revealing itself. And while the sex was getting
better and better all the time, Shelley indeed becoming the kind of woman he
had hoped for, he seemed unaware that she was catching up to him in the
strength department.

Penny had decided to let her previously short, "pixie" haircut grow out, and
she also had stepped up her workouts. The first time she took the pre-workout
supplement, in about fifteen minutes, even before she started working out, she
felt a tingling in her scalp, within minutes spreading to her whole body,
including her "always on the edge" pussy. In the middle of her stretching and
warming out, she found herself involuntarily ramming a finger in there and
bringing herself to an intense orgasm.

Coming down from her buzz, she became aware that this stuff was indeed
something special and she had to focus herself to accomplish her goal of
catching up to Brianna in the physically awesome department. She could get off
sexually anytime. Pete's devoted tongue was always available at her beckoning.
She needed to use the supplements to work out. And work out she did, possibly
the best of her life. And each subsequent workout from that day on was better
than the one before.

Nick managed to avoid coming home for Thanksgiving, but really couldn't find a
way to say no to visiting his parents and sister at Christmas time. Just as
well, Shelly was going to see her family, and he would be alone if he stayed
at the apartment over the holidays.

The Christmas visit did not turn out at all like he expected. First of all,
the usually immodest Penny stayed pretty much covered up the whole time. But
as he thought about it, Nick remembered that she really didn't show a lot of
skin during the winter months in the past, being prone to getting cold easily.
Still, she still wore her skin tight jeans which showed off her tight round
butt, and she always showed a lot of cleavage. With her red hair down over her
shoulders now, she was quite something to look at in spite of being mostly
covered up.

She never once confronted him and was actually nice throughout the whole
vacation. Nick assumed that what had gone on between them was a thing of the
past. But what really shook up his visit was near the end. One evening he
heard some muffled cries coming from down the hallway where his parent's room
was. As he got closer, it sounded more and more like his Dad. Cracking the
door open, he was shocked to find his Dad spread eagle on the bed, and his Mom
riding his face like there was no tomorrow while she roughly pulled on his
cock. And his mother, from what he could tell in the dark room, was no longer
overweight.

Back at school, Nick and Shelley settled back into their routines. Even though
Nick felt like his days of confrontation with Penny were a thing of the past,
he liked the fact that he was no longer a weakling, so he continued to work
out, but many times school work took precedence over exercise.

Then came another in a series of surprises. Nick had come home somewhat late
one evening after a long night of studying at the school library. He came into
the bedroom as Shelley called out from the bathroom, "Take your clothes off,
Nick. I'm in the mood to fuck your brains out tonight." While he was all for
it, he was somewhat surprised at her. Shelley liked sex and all, but she was
not particularly aggressive. He had just gotten his shirt and pants off and
was getting ready to take off his underwear when she came charging out of the
bathroom wearing only a thong and choker around her neck.

Plowing into him, Shelley knocked him onto the bed and before he could react,
she had his arms pinned to the mattress above his head and his legs
grape-vined. She smiled down at him as she felt his dick stiffen against her
pussy and firm ass. "I see this excites you. Me too. I saw one of your
wrestling websites and I thought it would be fun." She let go of her dual
holds and, straddling his body, inched her way up on her knees before
presenting herself to his eagerly awaiting tongue, pulling her thong aside as
she spread her legs to the sides and lowered herself down.

She wasn't all rough with Nick like Penny had been. She loved him and would
never hurt him, so she hovered slightly above him as he dutifully licked her
to several orgasms before she settled back, sitting on his chest. "I'm
catching up to you in the strength department, Nick."

"You're definitely way stronger than you were when we first met, but you're
not there yet."

"Well, considering the size difference, I'd say pound for pound I've got you
beat."

Nick was suddenly quiet. He wanted her to be fit and strong, just not
stronger. "Oh Nick, don't worry, I work out six or seven times a week. I'm
sure when you're studying settles down and you can work out more, you'll surge
ahead again. And speaking of surging, when are you going to put that bad boy
inside of me?" He flipped her over onto her back and excitedly mounted her and
they went at it for a half hour. Nick realized that he shouldn't worry, she
was becoming the type of woman that got him off the most, strong and fit and
she wasn't about to beat the shit out of him.

Penny was finding out that the fitness guide was as important as the
supplements, especially the part about eating. She was now consuming huge
amounts of protein and little in the way of carbs. As to the supplements, they
were reputed to be the best thing out there. In addition to having creatine in
them, to help intensify the workouts, they had nitric oxide, allegedly the
number one muscle builder out there that was legal. The results were
startlingly evident. Penny was gaining quite a bit of muscle while retaining
her shapely hot figure. And she was becoming very strong.

As to the way she was beginning to look, well, as has been stated, before she
started using muscle force Penny was a hot hardbody, curvy and tight all over
with very nice tits and a great round ass. At five-seven she weighed in at a
solid one hundred and forty-five pounds. And after just 4 months on the
program she had added 10 pounds of muscle, shapely female muscle that only
enhanced all her feminine curves.

Somehow, maybe the supplements, her hair was growing faster than usual. It was
full and half way down her back, cut so that it was longer in the middle and
tapering up on the sides. One of the stunning things about Penny's physique
was the difference between her very tight, smallish waist, to shoulders that
seemed to be twice as wide. And from behind, the haircut emphasized that
amazing difference in the shoulder/lap to waist taper. That physical feature
alone was enough for most people to understand the power this girl had, but
add the muscle, and there could be no doubt.

Penny had to miss Nick's College graduation. Earlier that spring, she had
decided that she wanted to be on the track team. Even though she had always
just worked out to be healthy and fit, and to look good, when she discovered
her natural athletic abilities wrestling her boyfriend, she had decided to see
what else she could do. Thinking back to when Pete was "teaching" her how to
wrestle, she remembered how quickly she learned and how she beat him after
only a month of fooling around.

The same thing held true with track, and now at the end of just one season,
she was headed to the state tournament on the same weekend that Nick
graduated. Her physical abilities had turned her into a top pole vaulter and
her phenomenal strength had made her naturally good in the field events. To
see her whip a discus or push a shot farther than girls who out-weighed her by
forty or fifty pounds was quite something. She was already getting scholarship
offers to several universities that were track powerhouses, all of them
wanting to move her to the pentathlon.

At any rate, she didn't get to see Nick graduate. When he came home for a
visit, he brought Shelley along. Since there had been no confrontations with
Penny at Christmas, he figured it was safe. Penny was very nice to Shelley and
they really hit it off. The trouble all started one day out by the pool. Nick
and Shelley were out sunning and occasionally jumping in to cool off. They
both looked good. Nick had gained about five pounds of muscle since the
previous year and was now up to one-seventy-five. Shelley was very shapely and
obviously fit with as much muscle showing as any woman in her mid-twenties who
exercises and watches what she eats.

And then Penny came out to join them. Always the show-off, she figured the
best way to make an impact would be to come out covered up and then show her
stuff all at once. When she dropped her terry cloth robe onto the chaise
lounge chair, both Nick and Shelley reaction was one of instant arousal. Penny
had added yet another five pounds of muscle. Now at a hundred and sixty
pounds, she was all tits and ass and curvy muscles. And that waist length
fiery red hair completed the picture of an ultimate hardbody walking wet
muscle dream.

Nick realized that he was breathing heavily and staring at his kid sister, his
boner quite evident, even though she was wearing a competition style suit that
was modest by her standards, but very sheer, almost see-through. But even in
that one-piece the superiority of her body was glaring. As he tried to subtly
cover his erection with his magazine, he glanced over at Shelley to make sure
that she hadn't noticed his reaction to his own sister. He didn't want her
thinking he was some sort of pervert, that wouldn't be good for their
relationship. But as he looked over at her, Shelley's mouth was open, her
lower lip quivering and sort of pouting and she was all but swooning.

Penny had become quite used to men's reactions to her awesomely beautiful
body. Indeed, at every track meet, she had guy's following her from one event
to the next like she was some kind of Pied Piper. But she also got off on
knowing that she caused that same reaction in some women as well, women who
never thought of themselves as being attracted to other women until they
caught a glimpse of Penny.

She smiled to herself as she went over to the diving board and dove in, just a
plain, straight in dive, but the bounce that she got off that board,
propelling her at least fifteen feet above the water, was truly amazing. As
she surfaced and swam to the other end, an idea popped into her head, the
ultimate payback. She could, and would make Nick's girlfriend have the hots
for her so much that she wouldn't be interested in Nick, and then she would
take her, right in front of her brother.

Trying to gather his thoughts, Nick realized that his little sister could
possibly have one of the most perfect bodies on the planet, just oozing
strength and sexuality. It was obvious that she had added muscle and logically
would be stronger, but, due to his confused state, his thoughts reeling from
how hot she was, when she asked him if he was ready for an arm-wrestling
re-match, he deluded himself into thinking that his new-found strength would
be enough to beat her.

Penny put her weaker arm on the table, although due to her training, both arms
were probably about even now. Nick sat down, acting very confident as Shelley
watched with rapt attention. Then Penny did the same thing to Nick that she
had done that second time they had competed. She allowed Nick to push her down
until the back of her hand was almost touching the table when all movement
stopped. Nick kept pouring it on, but Penny kept their hands frozen in that
position. Shelley couldn't see the gap between Penny's hand and the table, so
from her point of view, it looked like Nick had won, affirmed by Penny a few
seconds later.

"Congratulations, Nick, that's the first time you've beaten me. You sure have
gotten a lot stronger." But Nick knew better, and the look in Penny's eyes
told him that she was up to something, he just didn't know what. What he did
know was that he had all the leverage, had her hand an inch from the table,
and couldn't put her down even though he was trying his hardest, and she just
held them right there, with ease.

Then Penny looked over at Shelley, smiled and winked as Shelley clapped
enthusiastically for her guy. Penny got up, grabbed her robe and sauntered
off, making sure to make a show of how amazingly that muscular ass moved just
with the simple act of walking as Shelley stared at this perfect creature.
Shelley wasn't sure which turned her on more, Nick's victory, or Penny's
perfect body. Not that it mattered, all she knew was that she was suddenly
very horny. And she decided it was Penny that had her all wound up, after all,
Nick should have won. He was a guy, and bigger, but the delicious Penny put up
a good fight in Shelley's mind. So in addition to being totally hot, Penny was
also one strong eighteen year old female.

Shelley hadn't ever felt an actual sexual tide rising up in her before over a
woman. Sure, she could find other women attractive, and when she first saw
fitness women on that website she felt a tinge of envy. But she felt almost
overwhelmed by Penny's mere presence. Not even those videos of women wrestling
and beating men had had this kind of impact on her. Penny didn't really fall
into any category like fitness woman, even though she was extremely fit, and
she wasn't a bodybuilder, even though she certainly had a built body.

No, Penny was creating her own new category. A very strong, perfectly
proportioned female body that just emanated raw sexuality from head to toe.
Yes, Brianna was probably still ahead of Penny in the strength department, and
she was very hot, but Penny was even hotter, and proving to be just as
talented an athlete to boot.

The Adam's yard was big, with a grove of trees at the end of it. "Hey, Nick,
you were really something arm-wrestling. I saw all of Penny's athletic awards
in the house. She's probably really strong, an elite athlete it seems and you
put her down. I wanna fuck you right now. Let's go do it in your woods." And
so they did. Ever since Shelley had seen those mixed wrestling videos, she had
become more aggressive when it came to sex, but on this day, she was
voracious, taking it to a new level.

Before dinner, Penny and Nick's Mom and Dad were in the kitchen. Mom, who was
obviously way fitter than she was last summer, was wearing shorts and a
sleeveless shirt. "Mom, you've been exercising. You look great."

"Thanks. Penny's been helping me."

"Well, I think it's great. What about you, Dad?" Nick assumed that his Dad
didn't hear since he didn't answer. He just stared down at the sink where he
was doing dishes which was odd, because in the past his chauvinistic dad had
always considered this to be woman's work.

Penny came in a few minutes later. She had just finished a workout and was
quite pumped. Wearing her usual sports bra and very tight running shorts,
rolled down on top, revealing most of her torso. Nick and Shelley had been
able to see some of the detail through her sheer one piece bathing suit
earlier, but they were not prepared for the amazing firm torso in front of
them, glistening with sweat. Neither did a very good job of hiding their
reaction, eliciting a sly smile from Penny.

But then, they got their first real glimpse of her power and of the new family
dynamics all at once. "Hey Dad, I gotta rinse out the carafe of the blender so
I can make my protein drink."

"I'm almost done with the dishes. I'll be out of your way in a minute."

"I don't feel like waiting for your slow ass, Daddy." She went behind him and
put her hands on his elbows and then lifted him with seemingly no effort at
all, setting him aside so she could wash the carafe. Their embarrassed father
quickly left the kitchen without even drying his hands, his head down, looking
at the floor as Penny gave out a derisive chuckle and Mom giggled under her
breath. She turned to a stunned Nick and laughed at his eyes wide open
expression. "I'm surprised he showed enough courage to even consider asking me
to wait. Dad's not in charge around here anymore."

Another episode in the new family dynamics occurred later when Pete showed up
to take Penny out for the evening. She came into the room dressed to create
boners wherever she went, cutoffs that showed a lot of firm ass, and, like she
always did, rolled down to show as much skin as possible between them and the
too small tube top that she had poured herself into. No self-respecting father
would allow a teenage daughter to go out like that, and when her Dad started
to say something, she just looked over at him with an "I dare you" sort of
glare.

"You don't want me going out dressed like this, right, Daddy-Poo?"

"Well, ... ..no ... ... "

"Well, do you want to try to stop me?" He just looked back down at his book.
"I didn't think so." She turned and grabbed Pete by the hand and they headed
out. Nick and Shelly and Mom and Dad settled in for a quiet night of reading
in the living room. Not more than an hour later, Penny came bolting back
through the front door and up the stairs without saying a word. She was
dragging along some guy who wasn't Pete. Minutes later, the thumping started
and it was very loud, accentuated by loud moaning from Penny and occasionally
from the guy, punctuated with his cries of pain.

Nick and Shelley watched Mom and Dad intently, trying to gauge their reaction
to what was obviously some serious fucking going on by their teenage daughter
and her victim right there in their own house. He. Dad tried to pretend he
didn't notice. But Nick was quite surprised when his Mom got up. "Boy, that
Penny is something else, isn't she?" She went over and grabbed Dad by the
hand, yanking him off the sofa with surprising power, his book flying out of
his hands. "That sound is making me really horny. Let's go. I'm gonna ride
your face like there's no tomorrow."

After they left, Nick just sat there for a moment in stunned silence. Pretty
soon there were sounds of some kind of sexual encounter coming from another
part of the house. Finally, "What the fuck is going on around here?" He turned
towards Shelley just as she leaped on him, tearing off his clothes, and her
own and fucking the daylights out of him for the second time that day.

An hour later, the sexual noise from Mom and Dad's room had subsided, and Nick
and Shelley's coupling in the living room floor had settled down, but the
banging and the moaning, etc. continued for another hour coming from Penny's
room. At that point, down in the living room, Nick was sleeping soundly on his
back, on the floor, and Shelly was lying next to him, her head on his chest,
but still awake, listening to the goings on from upstairs. Finally, the
banging and cires of pleasure and pain stopped, and a few minutes later, Penny
and a thoroughly whooped guy came down the stairs, his arm over her shoulder
and Penny pretty much holding him up.

She was wearing only some tiny panties and a very worn out, way too small,
wife beater. He looked like he had been mugged and she looked like she still
had plenty of energy left. She helped the guy out the door, and as it closed,
Shelley heard a thump as the guy fell with Penny no longer holding him up.
Penny turned around, smiled, and gave Shelley a cutsey little girl sort of
wave, then bounded up the stairs, three at a time. Shelley shuddered, thinking
to herself, "I wanna be like her."