It all began when the corrupt council began on a massive expansion of the town against the wishes of the people. Due to their dodgy deals with developers they had built an ever-growing satellite dormitory extension that devoured the local countryside and marketed them to people wanting to escape the capital and commute. Crime rates soared and there was an influx of thugs and bullies to inflict their violent way of life on what had been largely a rural population. There’s one guy, Grant, or Grunt as we call him behind his back who’s a real pain.

On this particular day he took exception to me for no reason other than I didn’t speak with a coarse cockney accent like him and his new-build posse. They surrounded me in the playground at break and he literally kicked the crap out of me claiming he was a MMA cage fighter. I’m not a fighter and didn’t stand a chance, not that the onlookers cared. “Go on kill him,” they shouted and things similar as he kept slamming punches and kicks into my face as I lay on the ground, battered and bruised.

The next moment I found myself looking up to find my younger sister Jackie tending me, looking concerned.

“Oh Bobby, are you OK? I came as soon as I heard,” she fussed needlessly.

“It’s OK. It’s nothing.”

“It’s not OK. Have you seen your face? Mum and Dad will go spare!”

She had a point there. I let her help me to my feet, where I was horrified to find blood all down the front of my shirt and of course my pockets looted, although luckily I never kept much there.

Jackie was 2 years younger than me, standing 5’1” tall, presenting a broad chunky solid looking figure in her school uniform consisting of a white blouse, blue school tie, grey pleated skirt, white socks and black shoes. She looked short and stockily-built but it wasn’t puppy fat for she was a competitive gymnast and stronger than she looked, as I well knew to my cost. The skirt was quite short and showed off the lower part of her thick strong legs. She was quite pretty with long golden hair framing a small heart shaped face. With deep blue eyes, a small slender nose and a small mouth, she looked elfin and cute. Guiding me towards the nearest wash-room, she helped me clean up. I rarely saw her gentler side and I liked it.

“Don’t worry about Grunt, Bobby. No-one hurts my big brother and gets away with it,” she said. “Except me, that is.”

“Leave it,” I was horrified and ashamed that my kid sister wanted to protect me! “He’s a nutter who runs around with his new-build thugs”.

Unfortunately as soon as we left the building, he saw us together and approached.

“This your girlfriend, Priest? Go for the younger ones do you?” He sneered eyeing Jackie up and down in a manner I didn’t like.

I was shocked as she grabbed him by the front of his shirt and pushed him up against the wall.

“You leave my brother alone, you creep,” she snarled to his amusement at a cute little girl acting tough.

“Woah a feisty one!” he laughed, eyeing her up again. “Cute, maybe a bit on the plump side.”

I knew different but wasn’t going to correct him.

“Tell you what. Be nice to me, if you know what I mean, and I’ll leave the wimp alone,” He told her in a smarmy voice sliding an arm around her broad shoulders without noticing them and nodding his head to a narrow alcove between the buildings.

“OK!” she replied enthusiastically.

“Jackie you can’t!” I protested

“It’s alright, Bobby,” she told me with a wink that made me nervous.

“Judas, make sure we aren’t disturbed or else,” he raised a hammer-like fist in warning.

“Very witty,” she dead-panned.

To my horror, he began feeling Jackie up!

“Bet you got nice tits under here” he leered, groping her chest.

Smiling, she slid her forearms either side of his neck as he began kissing her neck while kneading her breasts.

“Feel my tits,” she says softly. “I’ll break your balls.”

Her right thigh pumped upwards, the pleated skirt falling back along her smooth bare skin. The knee thundered straight between his legs and into his groin with a solid thud. He wailed as his lunch-box lurched at the front of his trousers, then dropped to his knees hunched over his groin.

“Hurts,” he gasped, rocking and back and forth on his haunches.

“Oh, are you going to cry?” she sneered, standing over him with her hands on her hips. “The big bully nailed in the nuts and floored by a small schoolgirl!”

“I do MMA. I’ll get you for this,” he gasped.

“Yeah yeah!” she mocked then placed her right foot against his chest. Her thighs bulged strongly and he suddenly went right over onto his back. Pressing her foot down upon his chest, he gasped trying to move it from his sternum but couldn’t.

“MMA is for wimps! I’m a gymnast and we love making boys like you cry,” she told him looking down at him in derision. “Bring some of your mates along next time to give you more of a fighting chance,” she laughed.

I know it was wrong but the sight of my sister in her uniform standing in victory over the creep with a foot pressing down on his chest making it hard for him to breathe was so dominant. It made my cock really stiff and no, I don’t fancy my own sister! It’s just a pretty smaller girl dominating a much larger muscular boy was very arousing. Didn’t he notice how thick that lower leg was, right before his eyes? Her calves were so big that the white socks were stretched badly out of shape straining to contain them! Her foot pressed down upon his clavicle with the huge shapely mass at the back of her lower leg swelling large and hard, stretching the sock so much I could clearly see the large heart-shaped calve heads trying to break through! He was turning purple, gasping like a fish out water while slapping the ground frantically with his hands and legs as if having some kind of fit. Then he suddenly stopped moving, he was out cold and my dick gave a huge lurch!

“Come on, Bobby. Let’s leave this loser,” Jackie said removing her foot and turning to approach me.

I was speechless, I could barely contain the stiff throbbing in my trousers. My kid sister had knocked the big thug out by pressing down on his chest with her foot! I was stupefied by what I had just witnessed and terrified she would spot my hard-on! Jackie guided me, arm in arm, towards the Sports hall. This was a separate building at the rear of the school grounds.

“I’ve got gymnastics training,” she told me. “Maybe you should stay here until you feel better.”

“That makes sense. Grunt wouldn’t think of looking for me here and I’ve got a free study period this afternoon.”

“I know what sort of study you’ll be doing,” she teased with a smile.

I sneaked inside and chose a spot on the benches at the front then settled down with my books open. Unfortunately being so close to a group of super-fit scantily-clad teenaged girls doing all sorts of flexible bends and sexy stretches as they limbered up was a distraction. Most were clad in skin-tight figure-hugging Lycra leotards cut extremely high over the hips which clung to their firm sturdy bodies like a second skin and didn’t leave much to the imagination! They certainly weren’t dainty little girls. These fresh-faced schoolgirls worked their bodies hard from an early age like professional athletes with a steely tunnel vision determination to compete and win. Most had chunky strong bodies that would make a female bodybuilder envious with extreme flexibility and stamina. They had bodies that no young girl should have, enough to make a boy who wasn’t the sporty type feel inadequate. It wasn’t helped by having a thing for muscular fit women, something I discovered when wrestling my sister to my embarrassment!

Most were short with huge broad shoulders, massive rounded striated shoulder-caps on top of thick arms and big heavy strong legs. Big inverted horseshoe shapes of well developed triceps adorned the back of their upper arms while their forearms reminded me of Popeye’s with slim wrists quickly tapering to very thick almost sail-shaped opposite the elbow and quite brawny with vine-like creepers. Large trapezius muscles angled from the rear of their necks to their wide backs that sloped in an inverted V shape to slightly smaller waists. It was quite intimidating being so close to shorter girls, many of whom were younger than me, with such powerful looking bodies. A few were also quite well-racked, their top-heavy assets being supported and restrained by a sports bra visible through the almost translucent leotards. Some wore sleeveless leotards to proudly show off their toned firm arms with thick bicep veins that made me feel even weaker. Then there were a few, like my sister, who wore a tiny tight halter barely concealing anything. In Jackie’s case this was also translucent shiny white Lycra which emphasized her swelling bust. These tops were sleeveless and came barely below the bottom of the bust and worn with a tiny pair of shorts that showed off their devil’s horn’s peaking up in a tantalising V shape from the waist band. Jackie wore small briefs cut high over her hips and exposing so much skin I felt uncomfortable looking at her proudly showing off her ripped deeply chiselled 8-pack abs. Yes she is only a teenager and has an 8-pack! The way they moved in a sensual rolling muscular motion was captivating and I found it hard to stop the yearning to run my hands over that sexily ribbed belly. She also has thick toned arms and, thanks to large cutaways that showed more than it concealed, a phenomenally well-developed back which rippled with large irregular muscular shapes like a rocky contour map!

I prayed no teachers caught me here and accused me of perving on the girls, which in a way I was. They didn’t but someone else did.

“Oi! Priest! So this is where you’re hiding,” Grant roared.

Oh no! It looked like he took Jackie seriously and brought the whole gang, all trying to look hard as nails.

“Where’s your brat sister?”

He looked around then noticed the girls huddled together talking with glances over their shoulders at the boys.

“Blooming heck! Look at the arses on those!” he exclaimed. “I want to get right up there! No wonder you hang out here. Wanking off, I bet.”

Grant spotted Jackie amongst the other girls and went storming off towards her followed by his pals. I felt concern for my little sister and followed to the edge of the mat where they faced off. As he was over a foot taller than her, she looked tiny by comparison, admittedly one that was built like a small tank.

“You’re cruising for a bruising, little girl.”

“Wow, did you think that up all by yourself?” Jackie sneered.

“After I beat her into a bloody pulp, I’m going to use you as a human punchbag,” he told me. “And don’t any of you bitches think of helping or you’ll meet Mister Fist too,” he growled at the girls who didn’t look too impressed.

“Wow, is that the best you could come up with your single brain-cell?” she taunted “I don’t need help. Even a gymnast with no combat experience could sort you out.”

How can my sister be so cocky with this nasty piece of work. His face flushed with rage, he turned to a big nasty brute called Spike who had a skinhead haircut, look of low intelligence and a nose that clearly had been broken many times and not set right.

“Watch them, if they move pummel them.”

Spike grunted and gave a nasty smile then began punching a big fist repeatedly into his other palm.

I was really worried. Aside from gymnastics, my sister loved watching wrestling on the TV and occasionally tried out the moves on me against my will but Grant was used to pummelling an opponent. She had never faced an experienced fighter let alone a whole gang of them! I couldn’t think how I could help unless I slipped away and alerted a teacher but with Spike watching us, doubted I would get the chance.

“She’ll be alright, Bobby,” Treena told me sidling up to me.

Only 4’8” and a couple of years younger than my sister, Jackie had tried to set me up on a date with her which I rejected because she was just a kid. In school uniform, I thought her unattractive with glasses and braces on her teeth. However when I saw her in a tiny sleeveless halter and briefs without glasses, it blew my mind! For, although she was the shortest in the group her short lean slender body was the most shredded of all of them to a remarkable level with her natural skin tone highlighting her remarkable muscular definition. I tried not to stare, feeling awkward and afraid of becoming highly aroused by such a well-defined young little muscle girl.

“I’m going to make you suffer for what you did, you little bitch.”

“Why don’t you tell everyone out loud how I busted your balls when you groped my tits?” she said in a sweet little girl voice.

The other gymnasts laughed which made him mad with anger. Howling with rage he drove a huge fist powered by huge bulging biceps against her exposed belly. It landed with a fearsome thud then he roared, wincing in pain while Jackie showed absolutely no reaction. Clutching his hand he stared in disbelief at the astonishing sculpted wall of irregular paved muscle on her young belly.

“What was that?” she looked up at him smirking. “I barely felt a tap.”

“My God, your abs are like a steel wall!” he gasped. “You’re a freak!”

He looked around, noticing the sexy toned and ribbed bellies on the other girls.

“You’re all freaks. Girls shouldn’t have abs like those at your age!”

“Now it’s my turn,” Jackie said with sweet smile, raising her right hand and balling it into a fist.

The tendons in her forearm became very prominent with a swell of hardness around her biceps, but he didn’t notice.

“Go ahead bitch, my abs are as hard as ... WOARGH!”

The words were ripped from his mouth as her small fist slammed against his belly like an express train. The punch was fast, loud and solid like tenderising meat. Although he remained standing, his face was strained and red as he tried and failed to stop from creasing forwards, shocked that the sweet-faced young girl could punch so hard. The girls cheered while Jackie looked on in amusement.

“What are you going to do now, wimp?” she sneered. “Are you going to cry for your mummy?”

Straining for breath, he couldn’t stop staring at those amazingly well-developed deep-cut abs.

“Yes. That’s an 8-pack. Count them,” she pointed at that sexy bumpy landscape with the index fingers of both hands. “2, 4, 6, 8.”

His eyes followed each row of pair muscled slabs in astonishment as her fingers moved from bottom to top of that rocky central column, mesmerised as they rose and fell in a rolling motion that I found so erotic.