Muscle Growth Fanfiction Novels & Stories

His shoulders tensed as if every muscle in his body had suddenly tightened. Then a loud crack echoed across the training grounds. I flinched. Caleb doubled over, letting out a pained grunt. "What—" Another crack. Then another. My eyes widened as his body began to change. His arms grew larger, muscles stretching beneath his skin. Veins stood out along his neck as he struggled to stay upright. His breathing turned into deep, uneven growls. His fingers curled tightly. Then his nails began to lengthen. Slowly at first. Then much faster.

His muscles arm muscles would bulge on days he wore t-shirts and he was sporting a well defined six pack. Me and Aaron became friends and started to become closer over time, but I was always sexually attracted to him. I would always fantasize about him, when we went swimming together and I got to admire his gorgeous body, when he would sleepover and he stripped down to just his boxers, anytime we started rough housing it was hard to contain a boner because I would 'accidently' rub my hand on my crotch and sometimes his hand would meet my crotch. But what always turned me on was when he played football. His muscles would bulge and we would start glimmering with sweat and it would turn me on s

My body was tearing itself apart. I screamed as another wave of pain crashed through me. My spine cracked loudly, forcing me to arch backward in Damien’s arms. Fur spread rapidly across my shoulders and down my back. My legs lengthened and reshaped, muscles burning as they grew stronger. The worst pain came from my face. My jaw stretched forward, teeth sharpening into deadly fangs, while my nose turned black and sensitive. Damien held me tighter, his bare chest pressed hard against my shifting body. Sweat and blood covered both of us.

I laughed and returned his hug before pulling away, he was still super lean however I could see the glimpse of lean muscle forming. “Glen, look at how big Sera and Emma are now” He turned his full attention to the girls looking them up and down “Wow, Freya you managed to grow 2 absolute Goddesses, not that I expected anything less” He wolf-whistled before chuckling. “Come here you too!” He held his arms open for a hug. Emma the sweet girl wasted no time and hugged him tightly but Sera did not move. I lifted my eyebrow at her as her eyes narrowed,

I attributed it to his new and improved anatomy. He lifted himself away from me as he drove himself deeper into the wells of my being. I marveled over how defined his already muscular body became. It was as if someone took a chisel and outlined the muscles he already had before pumping them up just a bit more. They emitted power as they flexed to the rhythm of his thrusts.

Clementine Liam gripped his father’s hand, and both men erupted into a large orange glow. The air around them shimmered with power, and Liam started to grow larger as if it were possible. He was already a muscly, marbled god, but now, his shoulders seemed to become slightly broader with the power of an alpha. His arm muscles bulged out of the short sleeves of his button-down, and the buttons began to strain with his chest getting wider.

Then I'll be inside her every single night and day whenever I get the chance. I take Daemon out for his usual two hour run. He's becoming stronger by the day, speeding through the woods without getting tired. I haven't thought much about the concequences of being Ianthe's mate, trying to just keep the looming threats at bay for now. But there's significant changes to my body that I can't deny. My muscles are getting bigger, my stamina is enhanced, Ianthe better start taking her training seriously because once we're mated and I get her in bed.....

My face was flooding with tears. I held one of my hands in the aisle of the mountain as I continued fighting not to fall to the floor. My body was shaking, seeing my nails slowly growing like claws; my raining eyeballs almost fall off as my muscles stretched like it was fucking growing and tearing my skin. I couldn't feel my organs anymore; all I could feel was the pain embroidered in my skin. I continued catching my breath as I watched the fur start appearing on my muscles. "No... No... No!"

I’d already gone so much further than I should have, I was terrified he was going to just snap and leave. But his breath rushed out of him again like he’d been punched. He dropped his head so his forehead rested on the furs next to me, and his cheek lay against mine. His lips brushed my ear when he whispered, “You grow me.” I nodded, biting my lip, praying he wouldn’t flee. “And you grow me,” I rasped back. “It’s how it’s supposed to be, Cazz. It’s not a bad thing.” “Your power grew as well,” he said, his voice wary.

My fingers twitched, then cracked, bones reshaping with a sickening snap. My knuckles bulged, dark claws slicing through my flesh as they forced their way free. I gritted my teeth, veins standing out against my neck as the change took hold. My spine arched violently, the sound of vertebrae shifting like breaking branches. The fabric of my shirt strained, then ripped as jagged bone spurs tore through, the muscles beneath writhing as they expanded. A shuddering breath escaped me, turning into a snarl as my jaw unhinged and they elongated.