My friends little sister. By Smog. One day after school, I went home with my friend John. We were playing some game on his playstation, when I suddenly had to go to the bathroom. As I went past his sisters room, I peeked in. It looked like an ordinary girls room, except for the large dumbells that were lying on the floor. I pushed the door open, she were not here right now, and looked in the room. The walls were filled with posters of hugely muscled women, especially a picture of a super muscular black woman flexing her humongous bicep. I had always liked strong girls and as my eyes spotted a bodybuilder-magazine lying on the bed, I couldn't help but enter the room., settling on the bed and start to flip through the pages. I was drooling over the female muscles pictured in the magazine, when a voice from the doorway made me jump and drop the magazine on the floor. " What do you think you are doing in here you little worm?" The sound of the voice was some what rusty, yet feminine. Surprised, I looked up and saw John's little sister standing in the doorway. She was the biggest, most muscular girl I had ever seen. Her hair was tied back and her face was as beautiful as the rest of her. I just sat staring, dumbfounded at this beautiful creature. Sally smiled. She recognized the reaction I was having. She had seen it many times before. I was amazed. I had never seen muscles like that in my life. Not on a man or a woman, and especially not on a teenage girl! I felt myself grow hard in response to her incredible sexiness. "Oh you haven't seen my muscles yet, have you? Do you like what you see?" Sally teased as she flexed her bicep for him. The muscle bulged to it's 24 inch peak with the numerous veins darting across its surface like angry welts. She flexed and relaxed it and made it bounce up and down. She smiled as I sat, open-mouthed. She thought she saw a hint of a hard-on growing in his shorts. I had to restrain myself from reaching out and touching her bicep to test its hardness. I like I was about to explode. I had always known I was attracted to strong women. But I had never anticipated how deep those feelings went. Just watching this muscular beauty had me on the verge of orgasm. "My god!" I cried out, "you are absolutely huge! Enormous! Talk about a muscle babe!" Sally began to slowly flex her biceps. I just stared in awe. I was not prepared for this display. Women just don't get this huge. Sally began to saunter over to me. I knew I was staring but I couldnīt take my eyes of off this super-muscled babe. Sally flexed her pecs and her huge tits bounces. Her thighs bulged out with each step to an enormous size. Even her calves bulged out from her body. She stopped in front of me, flexing her mountanious biceps again. I almost spurted my load in my shorts. Sally mumbled something as she flexed her biceps again. I watched the 15-year olds arms swell up to 24 inches of solid muscled peaks. "And you think my ... muscles are big?" Sally asked. I stood and watched in amazement as her subtle movements squared her breasts up into blocks of muscle. "have you ever seen a girl with muscles like mine?", she asked, flexing again. The peaks of the young girls biceps shined as the skin tightened. "Gee, I don't even think I have seen men with muscles like that!!", I boasted of her as I wrapped each hand around a bicep. Seeming not to mind, Sally stood there in a double bicep flex while I adoringly rubbed the two mountainous muscles. "Mmmm ... I see. You like the girls with the big muscles!" she said with an enticing smile. She let out a soft giggle when I tried to squeeze her biceps and found them to be immovable, no matter how hard I squeezed. "Silly boy ... my muscles are like rocks", she giggled. My hands slid off her biceps as she stepped back. Smiling, she put her arms behind her head and arched her back. A sea of rippling muscles emerged from her abdomen. "Woaw!!" I blurted as I watched the muscles dance across her belly. "Mmmmmm", she moaned as she closed her eyes, in content of her own muscularity. I too, was content and becoming very erect. Sally flexed her biceps again. She turned to look at one of her peaked biceps in satisfaction of it's 24 inch circumference. "Ohhh ... I make the little boy hard.", she said, taking notice of my erection. The young girl repeated flexing her biceps a few more times, milking her arms for more muscle. Her arms bloated out to 25 and 1/2 inches. "Mmmmm ... they are very big, don't you think?", she asked me as I neared an orgasm. I was totally mesmerized by her huge peaked biceps. Then the door swung open. "Sally!!!", John angrily shouted from the door. "What are you doing?" An argument between Sally and John immediately broke out. I just kept quit as the two argued. John, at 6' 1" looked down at his 5' 4" younger sister. He was very well built and muscular, but not even in the same league as the 15-year old Sally's muscularity. The two screamed loudly, but then John, pushed his index finger into Sally's shoulder and shoved her a bit. I couldn't understand how anyone could even think of angering a girl with muscles like that, even if she is only 15. Sally took on a whole new presence after that. Clenching her fists, ripples of muscle slowly made their way up her arm as her brother continued to scream at her. I watched as Sally pushed her chest out and transformed her breasts into massive blocks of pure muscle. Her upper body lightly vibrated as muscles sprung into prominence. Her face turned to anger just as her older brother's voice had gone to a somber state, after taking notice of his little sister's pumped muscles. Sally said nothing as she slowly cocked her arm back while her brother continued to verbally abuse her. Her coiled 25 inch bicep was a vision of pure power. Her gleaming arm bulged with countless ripples of muscle. Her fist shot up like lightning, striking him in the chin and lifting him a foot of the ground. Before his feet even returned to the ground his face was met by her other fist, which swept across striking him in the cheek. John fell to the floor like a sack of potatoes. I couldn't believe I was witnessing this display of raw teenaged muscle and strength. Sally stood up her delirious and bruised brother. Holding up by the scruff, she threw a hard punch to his stomach. Her fist disappeared into his belly. The nearly unconscious John cringed in severe pain. Sally whispered something in a taunting, sarcastic manner, just before she punched him another 8 times in the stomach, each punch lifted poor John off the ground. Then Sally stepped forward and wrapped her arms around his neck in a choke-hold. Muscles bulged as she squeezed her arms tight. "Mmmmmmphh", she lightly exerted as her brother began to gyrate from the pain. She arched her back a bit and let out an erotic sigh as she crushed her older brother into unconsciousness. Letting go of him, he fell face first onto the floor. I had a feeling I never had before. I was turned on as well as scared by the 15 year old muscle-girl. Sally took a deep breath as she stepped away from her beaten brother. I saw that the she had a different atmosphere about her, seemingly basking in her massive muscularity. Her muscles bulged incredibly from the quick handling of her older brother. Sally looked up and slowly walked towards me. I was somewhat fearful of the young girl after witnessing the manhandling of John. I backed off, only to fall on my butt on the bed. "Sorry about that." She said in a calm voice. "He never learns." This made me relax a bit, even though the young girls upper body was radiating with huge muscles. "Maybe you would like to see more of my muscles?" she said as she began unbuttoning her skirt. The skirt slid down on it's own, but only halfway down her thighs. The enormity of her thighs prevented it from going any further. I watched as Sally peeled the skirt down over her massive 30 inch thighs. Huge cords of muscle, 3 to 4 inches thick, criss-crossed her thighs. Once the skirt reached her knees it fell to the ground on its own. Her flat sandals showed she had no need of high heels to enhance her protruding 21 inch calves. "You like?" Sally asked as she rubbed her thighs in admiration. I just gawked at the girl, who stood before me in only her panties and bra. "You've got the most incredible muscles I've ever seen." I replied in near drool. "I will give you a closer look!" she said in a childlike manner as she stepped over me. She came down on her knees, straddling her mammoth thighs on each side of me, forcing me to lay back on the bed. "Mmmmm", she sighed as she flexed her biceps. I watched as the 25 inch peaks pushed her skin tight. I reached up and caressed her mountain peaked biceps once more. "Ooooh!!", she squeaked, noticing my erection pushing up against her crotch. "Mmmm ... my little muscles really makes you horny!" she said as she slowly swayed her pelvis back and forth. I was near an orgasm under the muscular prowess of the 15-year old girl. Sally reached down and ripped my shirt open like tissue paper. She rubbed my abdomen and chest. "Sally will make you feel good." She said erotically. But then, just as I thought I was about to embark on a ride of muscular pleasures, things changed. Sally crossed her legs under me, trapping my waist between her thighs. "Hey ... what are you ..?" I sputtered under the slight strain around my waist. Sally straightened herself up on her knees, causing her thighs to come together and crush me hard. My back arched from the pain. With my stomach elevated, Sally cocked her arm back and I could do nothing but watch her arm ripple with muscles. I squirmed to no avail between the hydraulic squeeze of her thighs. Her fist came down hard and fast, burying deep into my stomach. Every ounce of air was forced from my body as my eyes nearly flew out of my head. As my face came up, spewing air, it was met by her fist. A loud thud rang when her fist caught my cheek, snapping my head back. Another hard punch to the other cheek and I was knocked out. When I awoke, my body felt like it had been run over by a car, or a tank, a tank with long brown hair and bright blue eyes. I looked around in a daze and saw Sally lifting weights in the corner of the room. As my eyes focused, I saw her muscles glistening as she curled a weight up and down. I looked on in awe at her body and felt my dick grow hard. I was soon nearing explosion just watching her huge muscular body. I glanced at the weight on the bar. Adding quickly, I realized that she was curling nearly 300 pounds! Her arms were huge and vascular, as she brought the weight down and up in rhythmic fashion. Curling 300 pounds for reps, I thought and then I actually did ejaculate in my shorts. Her body was so strong and sexy I just couldn't contain myself. Sally saw that I had awoke and put the weight down and approached me. I immediently fell to my knees, grabbed her thigh and began to kiss and lick her legs. "Please don't hurt me anymore, I'll do anything you want," I panted as I massaged and licked her muscles. She turned me on my back and hungrily tore off my shorts. She noticed that they were already sticky with cum. "Naughty, naughty, starting without me," she teased. Reaching between my legs, she cupped my balls in the palm of her hand. Her other hand followed, grasping my dick between thumb and forefinger. Slowly she began to masturbate me, one hand stroking my penis, the other massaging my testicles. Soon I was about to shoot my wad -- but Sally had other plans. she pinched the head of my prick hard enough to prevent me from coming. She crawled on top of me and put her lovely breasts in my face and I began to lick and suck. I felt engulfed by Sally's body as I nuzzled her breasts, actually it was the biggest pectoral-muscle ever seen on a human being. The groove they formed by colliding along her sternum was deeper than many big-breasted women. She rubbed her hard pecs all over my face and chest as she stroked my cock to rock hardness. At last she climbed on my hips and rubbed her hot, wet sex on me. She positioned herself and pushed her pussy down over my dick. She sat up straight and squeezed her pussy on me like a fist. Sally was hardly moving, but her cunt was milking my cock and she was rocking back and forth and moaning. She smiled steamily at me and flexed her huge muscles. She flexed her big biceps and I saw her pectorals thicken. I ran my hands over her, feeling her solid, granite-like abs. I started to really give it to her, slamming my cock into her sweetness from below. When we finally came together we held each other tight. I was holding on hard, and she almost lifted me off the bed as her hips pulled me into her. Sally's vaginal muscles were as well developed as all the others in her strong body. Soon she was squealing in delight as I lay gasping in disbelief. We came simultaneously. When it was over, Sally lay on top of me for a few minutes, grinding down on my well used organ, savoring the experience. To be continueed......