Anna's analysis

Anna watched as her mom's fist crashed against Billy's chin, uncontested. The studious young woman saw the punishing right hook connect, and her brother going from stiff as a board to limp as a noodle. She had to squeeze her thighs together and bite down on her lip to keep from creaming herself as the legendary boxer rolled face first onto the ground at their mother's feet.

Heather wasn't much better, suppressing the urge to moan, the need to touch herself as her son fell before her once more. She looked down at the twitching mass of muscle that was her boy as he drooled on the rug, inches from her. The fact that her daughter was watching made it even more erotic, but it was also the only thing that was keeping her from rubbing her beloved glove to her dripping snatch.

"W-well now..." Heather stuttered, trying to focus her lust-firing brain on anything but how much her loins were simmering, "...I certainly hope he learned his lesson..."

Anna nodded slowly, not speaking until she trusted her own voice not to squeak with need. "Which was... what exactly...?"

Heather took a shuddering breath, forcing her legs to stay apart and resist the overwhelming instinct to cross them tightly. Her eyes remained fixed on Billy's prone form, her chest heaving wildly underneath her lacy top. She felt heavy and damp, the rush of adrenaline mixing with pure, primal lust.

"Which was..." Heather started, pausing for a moment. She couldn't quite remember why she had started this little "lesson" other than being upset that a woman other than herself or Anna had nearly put her son's lights out, and in public. "Um... to respect his mother and sister, and stop being so weak in front of other women. Yes, that sounds right..."

Anna quirked an eyebrow, seeing her mom's cheeks tinted a bright pink before she looked back down at her napping bro.

"I'd say he learned something..." Anna hummed, the corner of her mouth curling slightly as her brother let out a light snore.

Heather let out a breathy, hysterical sort of chuckle, her gaze drifting back to the drooling, unconscious heap that was her son. The sight of him so completely broken, so utterly subservient to her whim, sent another wave of heat rushing between her thighs.

"Yes... I believe he did~" Heather crooned, the need for relief growing too much to withstand. She turned back to her daughter, unable to hide the guilty look in her eyes. "W-well dear, would you mind putting dinner away? I think I needed a... a LONG shower after that little spar..."

"Sure, Mom," Anna gave a curious nod, but accepted the excuse based on the layer of sweat coating her mother's heaving bosom. No sooner had Anna agreed than Heather made for the stairs at a brisk walk. The busty young nerd looked down at her twitching sibling and called after her retreating parent, "What about him...?!"

Heather didn't slow down in the least, shouting back over her shoulder, "Just let him sleep it off, dear! Goodnight!~"

With that, she disappeared completely, the sound of her door closing behind her echoing through the house. Anna stood alone in the living room, looking down at the snoring, beaten shape of her brother. He looked so peaceful, so vulnerable, lying there with his mouth agape and a string of drool connecting his chin to the expensive rug.

Slowly, Anna knelt beside him, brushing a loose strand of hair from his forehead. She took a few steadying breaths to calm her needy libido. She'd have time for that later. She had a job to do first.

Anna played the "fight" over in her mind. She was glad that it had been so easy to goad her mom into sparring with Billy. She'd expected to need either another glass of wine, or playing to her mom's ego. She was planning to encourage the woman to work with him on his form since she had already beaten him so often, but Heather had almost taken Carly's victory over Billy as a personal insult. She had been all too eager to reassert her dominance as the most powerful woman in her son's life.

Heather had come at the club champion full force, which is exactly what Anna had wanted. She wanted to see her brother pushed to his limits, watch for any signs of weakness that her supposedly prodigiously skilled mom could unveil. One thing had been clear from the start...

Her mom SUCKED.

Anna frowned, tapping her chin with the end of her pen as she stared intensely at Billy’s slack features. The young woman had spent the entire day watching Matthew and Carly train, her new boyfriend determined to help her new girlfriend know all the best strategies for dealing with a monster like Billy. The speed and precision that both of the trained fighters had shown put Heather's slow, clumsy strikes to shame.

Her mother was undeniably powerful in terms of strength and intimidation, or at least she assumed so by how effective her hits had seemed to be and how submissive Billy had been, but as a technical boxer? Terrible. Heather swung wild, telegraphed every punch, and wasted so much energy that she had exhausted herself in seconds.

Despite all that, Billy had looked completely terrified. If he was even half as good as Carly or Mattie, the boy should have been able to dodge every slow, clumsy blow that came his way. Instead, he just hid behind his guard.

No. "Hid" wasn't a strong enough word.

Billy was cowering...

Anna could understand if he had been holding back against their mom. No matter what her own relationship with her brother had devolved into, both of them loved Heather completely for being the incredible mother she had always been. It wouldn't have been hard to imagine Billy holding back and maybe even throwing a fight for their beloved mom. But it wasn't love or compassion written on Billy's face. It had been terror, pure and simple.

Anna's eyes sharpened, her analytical mind whirring like a computer processing data. Fear. Not the respectful deference of a son, but the raw, primal dread of prey forced to confront a predator. Even though Heather was technically a terrible fighter, Billy reacted to her as if she were a juggernaut capable of splitting him in two.

Thinking back to her own training with her brother, Anna remembered him acting much the same. When their mom had first suggested it, Billy had been extremely hesitant to give her a chance to actually throw a punch at him. Like every blow could be fatal.

And it had been. One punch had been all it took to fell the giant. Sure, she had gotten a glancing blow at first, but it had ultimately been one well-placed uppercut that clocked him out for the night. Their mother had been no different. Once Billy had decided not to fight and simply accept his "punishment", mommy had tucked him away on his floor mattress with one shot to the chin.

But why? How?! Anna had seen plenty of matches Billy had competed in before she lost interest in his arrogant attitude. She knew he could take a punch. His legacy of being the invincible "Iron Chin" was built around his insane durability. How could he have survived so many matches against a boxer like Matt, been loudly spoken about as "the future of the sport", but been so completely terrified and humbled by noobs like Anna and Heather?

Anna chewed on her lip as she considered. It had started with Heather, that much was clear. According to Matt, Billy hadn't started having his downward spiral until a few weeks before Anna had returned from France, which meant it had to be after their mom had knocked him out for the first time.

But how could she have done that? How could someone as clearly amateurish as Heather be the one to send Billy off to Dreamland before anyone else? And not once. Not twice. But at least three times before Anna even returned home!

It was almost like her gloves had a built in weapon...

Anna scoffed. "Yeah right..."

Anna shook her head, dismissing the absurd thought. There was no way. Gloves weren't enchanted. Her mom had said that Billy himself had given her the gloves himself, and why would he give her something that could lay him out?

Even on the incredibly off chance that there was something... unusual about the gloves, that wouldn't explain Billy's performance outside of the house. How Mattie had said he was distracted lately. How Carly had punished him to the point of needing to be rescued. How Anna had been able to wrestle him into another beaten slumber without throwing a single punch.

Anna mewled at that memory. She had been sooooo turned on as she smothered him out. And Billy had clearly been enjoying her body being rubbed all over him, even if he would never admit it. She could see why Carly and Matt loved to wrestle so much. She had trapped Billy's face between her legs in a similar way to how Carly's thunder thighs had been crushing Matthew's head when she arrived that morning. Fuck that had been hot!

"Focus..." Carly panted, trying not to get worked up. She could do this. She could figure it out. Then she could finger-bang herself stupid...

Anna bit her cheek harder to snap herself out of the fantasy. She forced her eyes away from her brother's broad, muscular torso and focused on the task at hand. She needed to find his weakness. If she could identify it, then Carly was guaranteed to finally get justice for her arrogant brother's cruel and humiliating treatment of her.

She forced her mind back to the immediate puzzle. If it wasn't the gloves, and it wasn't pure talent, what was changing? What could have made her unbeatable bro so docile? So scared? So feeble that he would fall to a single punch to his iron...

"...chin..." Anna whispered, her eyes going wide with realization. Where had her mother struck him? Where had Anna struck him? Why had he been so desperately hiding behind his guard, afraid of a single blow getting through?

Anna turned back to her brother, sprawled out and snoozing on the floor, saliva flowing freely from his dopey, open maw. She poked his cheek. Nothing. She poked his nose. Nothing. She poked just below his eye. Still nothing. Biting her lip, Anna lightly touched her finger to Billy's chin, right where their mom had struck...

"...nnngh..." the sleeping champ groaned, the smallest of flinches making him twitch. Not enough to wake him, but enough to see the writing on the wall.

"Found you~" Anna purred, her heart soaring.

The pieces clicked together in Anna's brilliant, scheming mind with satisfying speed. It wasn't magic, and it wasn't power. It was physiological conditioning. Billy wasn't cowering because he feared her strength. He was cowering because he had developed a Pavlovian response to being hit in the jaw! Every time someone landed a solid strike there, his brain shut down, his muscles went limp, and he slipped into that blissful, humiliated stupor.

Her mother hadn't accidentally discovered his weakness. She had created it! Through repetitive, targeted trauma, Heather had essentially reprogrammed her son's combat instincts. She had turned the "Iron Chin" into a kill switch.

Anna giggled quietly, her eyes dancing with malicious glee. Oh, Carly was going to absolutely LOVE this information.

The busty nerd darted upstairs to her room. She had to get a second opinion to solidify her hypothesis, and she knew just who to call. Closing her door behind her, Anna pulled out her phone and video called Matthew. After a few rings, he appeared on the screen, shirtless and sweaty, but grinning happily at her.

"Hey there, beautiful. Miss us already?" Matt winked at her, Carly appearing on the screen as well.

"Hey, babe! We were just about to wrap up for the night. I think I finally got the hang of that counter trick Mattie's been trying to teach me," Carly smiled, resting her chin on their joint boyfriend's shoulder. "How's the investigation going? Don't tell me you already figured out Billy's kryptonite."

Anna flopped onto her bed, propping herself up on her elbows while her eyes sparkled with mischief. She couldn't wait to share this discovery. Seeing Carly's smug, triumphant face made was already making it even more satisfying.

"Oh, you guys have NO idea what I just figured out," Anna began, her voice dropping to a conspiratorial whisper. "But first I have a question. Matt, have you ever heard of a boxer developing a... weak spot?"

Matthew nodded and gave a contemplative shrug. "Sure. It's not unheard of for a boxer to develop a place that is more susceptible to damage. If it takes a hit it can be crippling, physically or mental..." the young brawler trailed off, his eyes widening in understanding of her question.

"Oh my god, of course!" Matt smacked his head as realization hit him like a speeding train. "You, your mom, you found a sweet spot! He realized he was vulnerable and he's been off his game ever since!"

Carly was dumfounded, hardly able to believe her ears. "Hang on. Are you telling me this is real? Billy has a literal Achilles heel?!"

"More like an Achilles chin!" Anna giggled, nodding enthusiastically.

Carly's jaw nearly hit the floor. "How the fuck did you figure this out so fast?! It's been two hours!"

Anna suppressed a squeal of delight at the reaction both of them were having, she puffed out her massive chest, smirking with pride. "You should have seen it, guys. Tonight could not have gone better! He was so easy to get tripped up and confused. And when I mentioned your name Carly? He nearly pissed his pants!"

Carly's eyes lit up like fireworks. "That's right, bitch! You're gonna piss yourself again soon enough!" she chuckled, pumping her fist in the air. "Fuck yeah, Anna! You're amazing!"

Matthew grinned, shaking his head in amazement. "I gotta hand it to you, Anna. I knew you were smart, but damn! What else happened?"

Anna settled back against her pillows, preening at the praise. "Well, I figured he wouldn't be willing to have a training session with me again, but I knew that he couldn't refuse Mom. After she heard about what Carly did to Billy at the club, she was dying to get her gloves on and see what she could do, and Billy was a stuttering wreck..."

Anna proceeded to explain how Heather had been throwing wild punches, but how Billy had meekly hid behind his gloves the whole time, afraid of taking a single lucky shot. She kept the flirtatious teasing and KO that her mom had delivered to herself, but she did say how the unstoppable milf snuck a fist to Billy's chin, that her brother had literally just drained of all his strength.

"I couldn't believe it when he just... dropped," Anna purred, resisting the urge to touch herself as she gave a safe version of the story to her lovers. "But when I figured it out, I tested it myself. Just a gentle little poke to that point and he flinched!"

Carly was practically vibrating with excitement. "Holy shit, Anna, this is huge! With this info, I'm gonna destroy him! I'm gonna make him beg for mercy!"

Anna nodded in agreement. "I know you will. But I had to be sure I wasn't imagining things. That's why I called Matt. After all, he is the only person that can push Billy, yet he never once managed find this mythical chink in his chin armor? No offense, Mattie..."

"Don't worry about it," the young man waved it off. "The truth is, I probably have hit it. I may have even contributed to making it, but didn't have the same effect. A sweet spot like this forms one of two ways. The most common is from an injury that didn't heal properly, or is still healing. Billy is in a different mindset when up against me, or in competition. His adrenaline would have him power through any weakness without even noticing it's there."

Anna listened intently, absorbing the scientific explanation. It made perfect sense. Against professional opponents, Billy was fighting for his career, his ego, his reputation, his title. He could take more hits and just keep pushing through the pain, never understanding the extent of the damage building up over time. If it even registered at all. Adrenaline was a hell of a drug.

"But that first night he trained Mom, all his guards were down. He left himself open, and she nailed him in a way our beloved champ never saw coming..."

Matt nodded in agreement. "Exactly. He let himself be vulnerable against the most unlikely of opponents, and she knocked him on his ass. It put the fear of losing, of being close to being knocked out in his head. That's the other way these things come around. It's psychological."

Carly let out a chuckle that was overflowing with gratification. "Are you telling me that this all just in his stupid little head?"

"Possibly," Matt grinned, amused by the irony. "Think about it. He takes on hulks and bruisers all the time. Some of the sharpest skilled fighters available. But a sexy, untrained, middle-aged milf floors him? It put a trigger in his brain. Whether he really does have a weak spot or not doesn't matter. Billy believes he does, so he does..."

"Holy shit! He really is getting a taste of his own medicine, isn't he? Of what I lived with after he ran me out..." Carly squealed, bouncing on her heels.

Matt kissed the frizzy-haired fighter on her forehead, pulling her close. "He is. And you'll never get a better chance to take him out than now. This could be temporary if his body heals or he works it out for himself. He might recover, he might not. But I'm not letting anyone else steal this victory from you."

Anna smiled, feeling a rush of affection for her new boyfriend. He truly cared about Carly's success, and it showed. He was the kind of guy who would support his girl, even if it meant helping her beat the shit out of his best friend.

"And I'll be there to cheer you on, Carly," Anna promised, her eyes bright with enthusiasm. "Billy deserves everything that's coming to him. And who knows? You might even be helping him. Maybe after you knock him out, he'll finally realize that he's not untouchable anymore."

Anna didn't believe that for a second based on her own experiences she'd had with her sibling lately, but whatever spurred her girl on.

Carly's expression hardened with resolve. "Damn straight he does. And I plan on making sure he remembers this lesson for a long, long time." She slammed her fist into her palm, eyes burning with righteous indignation. "Spread the word, you two. Tomorrow, I'm putting Billy the Big Bad Boxer out of his misery~"