(A/n: Here is the requested chapter, also thank you mike, glad you like the crossover idea! Maybe once I'm done with Stenny Short Stories I'll get right into doing it, Stenny will be the main pairing.

Summary: Best friends and their sisters go at it one late evening.

Stan and Kenny are 16, Shelly is 18, and Karen is 12. Please enjoy)


Chapter 25: Evening Showdown

In the backyard of the Marsh's abode, are Stan, Kenny, Shelly, and Karen. Two of them are battling each other while the other pair are spectating until it's their turn at a safe distance. One is cheering on one of the fighters while the other is standing beside them with a worried frown on their face.

"Yeah kick his ass! Break all his bones!" Shelly shouts a bit too enthusiastically.

"No don't do that!" Kenny objects in a panic. He glares over at the excited brunette. "You need to relax, it ain't even that serious."

Shelly cachinnates at her brother's cry of pain when he gets kicked in the shin, then she calmly looks Kenny's way. "You need to shut up and worry about yourself." She flashes him an eager grin with a similar gleam in her cobalt blue eyes before looking back at the battle going on ahead of them, cheering on Karen once more.

Flipping her off, Kenny returns his focus towards his best friend and little sister going head to head with each other. He knew a day would come when Karen would put her Kung Fu skills in action, however not against Stan. He'd rather it was against fatass or Shelly even. Kenny stifles a laugh at the thought, just as Stan gets socked in the gut, either scenario would be hilarious. Kenny only taught Karen the martial arts for self-defense purposes, he himself had been under the tutelage of a deceased Kung Fu master. He had met the elderly entity upon his arrival in Hell, and was for some reason searching for a capable successor to pass his ancient arts on to. A capable and evil one. Kenny figured he'd fell into the evil category because he'd been in the netherworld more times than in Heaven, though he didn't understand how he came off as a fighter. But he chose to appeal to the old guy's fantasy, he was going to be trained for free after all. He was there long enough to learn and grasp half of the centuries old techniques.

As for Stan and Shelly, Stan has been doing karate since he was young however Shelly took up kickboxing just several months ago. Why? Kenny doesn't know but guesses it's to abate her inferiority complex. She hasn't been able to bully Stan as often since he knows how to fight back.

After five minutes, Stan's and Karen's match draws to a close, much to Kenny's relief. They'd been going at it for over ten minutes now, it's about to be nighttime soon. He goes over to the two, whispering his thanks to Stan for taking it easy on his little sister, to which the noirette tells him that he probably would've lost anyway had he not. He limps towards the swing set. Kenny then goes to check on Karen, glad to see that she's completely unharmed. Her long light brown hair that's tied into a ponytail is disheveled from constantly moving about and has some specks of dirt and grass in it. She smiles at him.

"I won!"

Grinning, Kenny ruffles her head. "Good job Kare."

Shelly's guffawing resonates throughout the quiet neighborhood, startling a dog into barking at her.

"Shut up," Stan grumbles. He expected his heartless sister to relish his defeat, but it's still very annoying. No, Shelly is the personification of annoyance. He's not mad nor humiliated that he lost to a little girl, not at all in fact, he wasn't planning on actually fighting her to begin with. Not only was Karen a girl but she's also Kenny's younger sibling, there was absolutely no way he was going to hit her, even as a form of retaliation. Instead he had shoved her around and parried her attacks, hoping to tire her out. The end results indicate that that tactic didn't work, she was eager to win.

"Stan?"

Standing in front of the swings, Stan turns to the voice, looking to see Karen stretching out a hand. "Gg's! Also I'm really sorry about your leg, I didn't mean to kick you so hard," she says sounding apologetic.

Stan smiles at her sincerity, he's glad that he didn't hurt such a sweetheart. Even if she'd probably broken his leg. He shakes her hand. "No worries, you kicked my ass. Gg's." He chuckles.

"Damn right she kicked your wimpy ass," Shelly scoffs as she approaches Kenny.

Shooting her the bird, Stan and Karen take a seat on the swings, the noirette groaning in both pain and relief.

Standing face to face four meters apart, Shelly starts cracking her knuckles. "You're so goin' down."

Kenny isn't intimated by her threat as he begins to do some stretches, he's actually looking forward to getting some payback for the past years she's been harassing him. "No you are," he smirks.

"Fuck her up dude!" Stan shouts. "Make her so ugly that mom and dad'll wanna disown her!" His friend bursts out laughing.

Her cheeks heating up in anger, Shelly spins around to face Stan. "Shut up before I break your other leg!" They shoot each other the middle finger.

Karen finds the exchange humorous. "Good luck you two!"

With a huff, Shelly turns back to Kenny seeing him taking his parka off. Not caring if he's fully ready or not, she charges at the blonde preparing to deliver a flying kick. Kenny quickly gets into a stance, Shelly skidding to a halt before she even leapt into the air. She stares at him with widening eyes.

"What's wrong? Come at me!"

Shelly continues to gape at him in silence, until she explodes with laughter. "W-what the f-fuck?!" Clutching her stomach, tears already start leaking from under her closed eyelids. "Y-you look so fucking stupid hahaha!"

Stan erupts into a laughing fit also while Karen face-palms, shaking her head. "I should've known he'd go into that stance."

Kenny is stood on one leg and his arms are high above his head in a v-shape, his hands pointed downward. He is perfectly still, the setting orange sun and a flock of flying birds at the back of him making his form appear as if he's starring in an old Kung Fu film.

"Whoooa," Stan and Karen murmur in awe.

As his adversary proceeds to crack-up, Kenny decides to strike. Switching stances, he closes in on Shelly. He aims to karate chop her on the back of the neck, yearning to do much more while she's distracted but couldn't find it in himself to do that. So instead he'll just knock her unconscious for a quick and easy win.

As soon as he brings his arm down behind the older teenager, Shelly abruptly recovers fast enough to grab his wrist. Startled, he fails to react to her counterattack, her foot clipping one of his, and sending him falling to the ground. He lands on his back with a grunt, but before he can do anything a foot pins him down hard enough to force some air out of his lungs.

"Nice try turd."

"Whoooa," Karen awes again.

"Damn," Stan curses.

"No one's ever avoided Kenny's 'distracrane' stance before," Karen says cringing shortly after, those are her brother's words not hers. It's short for 'distracting crane stance'. Noticing the pained look on the Kenny's face fills her with a bit of worry. "Kenny, are you okay?!"

Cracking a small crooked grin, the blonde shoots her a thumbs up, then clasps Shelly's wrist using that very hand. He yanks her off to the side. Shelly is shocked by the amount of strength the skinny boy exerted, especially from his position. Kenny gets back on his feet, narrowly dodging a kick that targeted his face. He expected a retaliation from her this time, but not the speed of it.

Shelly doesn't stop there, going on a kicking and jabbing spree. Most Kenny parries or blocks, even risking to take some hits head-on to dish out some of his own.

Their siblings watch them at a loss for words, it's like they're viewing a live action scene from a movie right before their very eyes. The movements, the sounds and visuals of each strike that lands, misses, gets deflected or evaded, even the blood and contusions; they are all real.

By the time there is a victor, the sun had been replaced by the moon. The side porch's light flicks on, illuminating part of the backyard. Stan and Karen never once looked away from the fight, they were far too captivated to avert their gaze anywhere else for even a split second. Nearby crickets make the silence around the four somewhat less tense, then it's broken altogether by Stan.

"Hah! Serves ya right!" He says mirthfully, pointing at his fallen sister. She's sprawled face first on the ground.

Karen gets up heading towards her brother, his back facing her. "Congrats Kenny!" When she doesn't get neither a response or any other form of movement from the stood stiff teen, she frowns and ambles in front of him. Her eyes enlarge with a gasp. "Oh my God!"

Her exclaim alarms both Stan and Kenny, the noirette springing up from his seat and the blonde blinking his eyes only to wince afterwards. Did he past out? While standing? "What?! What is it?!" But then Stan's panic changes into confusion upon hearing a stifled laugh from the girl, he hisses when the dull ache registers in his leg.

"W-whatcha laffin' at Kare?" Kenny asks.

"N-nothing." Karen looks away, unable to contain her laughter.

"Yeah zh'er iz. Iz zh'er somezhin' on mah face?"

Very curious as to why Kenny sounds like that, Stan hobbles over to them. Thanks to majority of the moonlight and the porch light behind his friend, Stan now sees the reason. Kenny looks like he'd gotten stung by bees and then had an allergic reaction, he also has a black eye. No wonder Karen finds this hysterical instead of painful looking. "There's a lot on your face dude," Stan snickers. "I hate to admit it, but Shelly fucked you up bad!" Then he roars with laughter.

Kenny tries to frown, but his swollen face makes it difficult. "Fwelt wike I was fwightin' a Goddamn kangawoo." That remark makes them convulse harder.

"Uuugh, shudda'..."

The three look to see Shelly struggling to push herself up. Calming down from her fit, Karen inches to help her, but Stan stops her with a shit-eating grin on his face. "Why don't you make us? Oh wait you can't cuz you got your ass beat!"

Now on all fours, Shelly snaps her head in his direction, irate by his taunt. "Yew lost too dumbass!" All three start cackling. When she glares at them, rising to her feet, she makes the face of what an angry puffer fish would look like. "Da fwuck's sho-" She blinks, now understanding the cause of their levity.

"S-s'e ain't da only one dat got fwucked up!" Kenny chortles. His whole head is killing him, even has a pounding headache while his body didn't sustain that many injuries, but he's just so proud in himself to care about the intense pain. What a better way to rapture your win with a good laugh mocking your opponent.

"Grr fwuck you!" Shelly seethes, her pulverized face hot with rage. If she wasn't feeling so drained of energy right now - being pissed off is making her feel lightheaded - she'd kill them. Except Karen.

"I-I think we should keep it down now that it's gotten this late," the little light brunette haired girl advises, wiping at her mocha brown eyes. "I'm surprised nobody complained all this time."

"Y-yeah that's true." Stan gets the remaining bit of laughter out of his system, drying his eyes also. "We need to finish up before mom and dad gets back." They'd left earlier to...actually he forgot, but remembers them mentioning that they were going to be back by the late evening. Which already past minutes ago.

"So it's me versus Kenny now." Karen frowns at her brother's face, his bloated cheeks wet with tears and blood. He's too scared to wipe them away, he's already in enough pain. "Are you up for it?"

Kenny gives her a short nod. "Yeah as long as yew don't go for mah face." Karen still appears hesitant. Perceiving this, Kenny tells her to think of this as one of their training sessions, alleviating her of her reluctance.

Seeing that they're ready to begin, Stan turns and goes back to sit on one of the swings. "C'mon loser," he beckons his sister, earning a shove from her that nearly makes him fall. He steadies himself by applying weight on his good leg, glaring at her as she passes by. Both giving each other the bird again.

"Hey Stan?" Losing the scowl, the noirette looks back at the person who addressed him. "Can you set a timer for five minutes?"

"I left my phone in the house, I'll go it real quick."

"Oh no need," Karen says with a haste. Her guilt for almost dislocating his leg still hasn't diminished, she can't possibly have him limp his way to and fro just to be a timekeeper for their match. "We'll just...umm..."

"Fwight till da first person knocks da ozha one down," Kenny proposes.

Karen nods, liking the idea. "Okay."

Shooting them a thumbs up as a gesture of good luck, Stan hurries to create some distance as Kenny and Karen do the same; Shelly laughing at her brother struggling to sprint from by the swing set.

Kenny and Karen get into different stances, ones that Kenny only showcased his sister once for her to learn. Kenny's is the tiger stance, Karen's is the dragon stance. Stan and Shelly can practically envision the deadly beasts emanating from off them, a ferocious tiger baring it's fangs at the all mighty wingless dragon.

A soft cool breeze blows, and the final bout of the day commences with Karen advancing first.

Her thumb, index and middle fingers curl to form a dragons claw. Closing in on her brother, the teen crouches down to deliver a swift frontal sweep, but she jumps just before his foot grazes hers, taking him aback. Now that he's completely vulnerable, Karen seizes this chance to push him down with her palms. But Kenny quickly rolls to the side, getting back on his feet to dodge and/or veer away the girl's onslaught of hand strikes. Some fists, some from the heel of her palms.

" 'ow da hell can he cee wit' hiz face busted up wike dat?" Shelly inquires grumpily. She's not really upset about her loss, otherwise she'd be the one combating against Karen right now, the only person she gets along with or rather tolerates her. She at least figured that all damage she'd dealt onto Kenny would've given Karen a great advantage at claiming victory, however that isn't looking like the case at the moment.

Stan shrugs. "Instincts I guess." Shelly grunts at his reply.

Now it's Kenny's turn to go on the offensive, Karen had tired herself out. He doesn't put too much power into his attacks, mainly because he's also out of energy. Being in extreme pain and fatigued are the absolute worse combination. But he tries to endure, even as his one-eyed vision starts to distort.

Karen instantly notices his momentum slowing down, and at this point he's just lazily throwing out tiger claw strikes. He's reached his limit as well, it was only a matter of time. He did get the worse beating out of all of them, the least Karen can do is ease his endeavor and let him win. Just as she thought this, despite knowing that Kenny will disapprove of her forfeit afterwards, the blonde thrusts a palm towards her. She doesn't move. Since he's exhausted, the force won't be enough to push her down so she'll make it seem like it did.

His opened palm is just inches away from her. Expecting the light impact Karen slackens her muscles. But Kenny goes straight past her, falling flat on the smooth, smothered grass, his intended arm to push her stretched out.

"K-Kenny!" Karen gets down on her knees beside him, the boy releasing a muffled groan. Stan comes over asking if he'd passed out, Kenny answering his question with another groan. Karen flips him over onto his back, his arm remaining outstretched.

"I-I'm..d-done..." Kenny pants.

"Boooo!"

"Good call," Stan says approvingly. He looks to the younger McCormick sibling, giving her a small smile. "Congrats Karen, you're the winner."

Karen returns the smile. "Thank you Stan." She looks down at her brother. "And you too Kenny, was a good match while it lasted."

Kenny frowns, though he looks more like he's pouting. "S-sorry I couldn't pwut up a bwetter fwight."

Karen shakes her head. "Considering the state you're in, I'd say you did." Kenny's expression lightens a little.

Two bright lights flicker into Stan's peripheral view, turning his head to see that it belongs to a car. His parents' car, that is now pulling into the driveway of their house. He pales. The soft hum of the engine catches Karen's and Kenny's attention. "They're here..."

Karen begins to panic. "W-what should we do?!"

Stan composes himself to think, luckily an idea pops up in his head a few seconds later. "Kenny can you stand?"

"Yew seri'ouzly expect me to walk wight now?"

"Not by yourself obviously, Karen'll help you. You guys'll have to hurry up to the guest room, me and Shelly will distract them."

Karen nods while Kenny groans again. "C'mon bro." Grabbing her brother's extended arm, she carefully pulls him up into standing, slinging his arm over her shoulder. As quickly as they can, they enter the house, Stan filling Shelly in on his plan. He's very glad that she agrees to go along with him without a fuss. After retrieving his friend's orange parka, he walks in closing and locking the back door, then goes to drape the overcoat across Kenny's shoulders.

They hear the doorknob to the front door being fiddled with, Karen and Kenny just reached the staircase.

Thinking fast, Shelly hurries towards the door in the nick of time before it opens, slamming it closed with her back. Her parents sounding evidently confused, she keeps the door shut no matter how hard they try to force their way in, now demanding to know who or what's blocking the door. She hisses for Karen and Kenny to hurry the hell up, and they do so as best they can. Well Karen tries to at least, Kenny tells the older teen that it's her fault that he's like this in the first place. Plus he wants her to suffer. But unfortunately Karen won't let that happen for she urges him into picking up the pace.

Shelly refuses to budge until they're all the way up the stairs. When she lets up with a heavy sigh, she's sent flying to the floor from the strong push from behind. A "pft" can be heard from Stan.

Their parents come in furious, but notices their daughter laid out on the floor. Not moving. Stan cooks up a lie for both Shelly's reason for preventing them access into their own home and for the dirt stains and bruises doting their frame, which takes them approximately ten minutes to believe.

After grabbing something from out of the refrigerator in the kitchen then warming it up in the microwave, Stan makes his way up to the spare room. Shelly had regained consciousness amid him fibbing to their parents and had retreated to her room, also congratulating Karen on her win. Opening the door, Stan sees Karen sitting on the edge of the bed while Kenny is laying on it. He walks in shutting the door behind him, holding a paper plate emitting a rich, delicious smell that instantly fills the air in the small compartment.

"Here ya go."

Nearly drooling, Karen beams at the single food that's being handed to her. "Thank you!" She takes it as if she'd been given an exquisite dish.

Stan sits himself beside her on the mattress, his leg feels slightly better but he still needs to inspect it. "No problem, you deserved it."

"Mmhmm," Kenny hums drowsily in agreement.

"Yeah, but I still can't believe we did that just for a slice of pizza," Karen giggles.

Grinning, Stan shrugs. "Well we all wanted it so what better way was there than to fight for it? Besides, it was pretty fun." Neither Kenny or Karen denies his last statement. Instead of eating it all by herself, Karen shares the pizza with the two boys, feeding little bites to Kenny since his mouth is swollen. They joke about how he's being treated like a baby until the pizza is all gone. They bid each other good night, though they needed to tend to their injuries first before getting any sleep.

(A/n: Sorry, I just couldn't have Stan fighting lil ol Karen lol But I hope this was at least okay, if not don't hesitate to tell me so. I hope the rest of the readers enjoyed and the next chapter will be up soonish)