Chris felt a rush of adrenaline roll through his body and he started to flex his arms. Nate still slightly in shock at finding his younger brother suddenly staring down at him now watched intensely as his brothers biceps slowly began to show themselves more and more. The slopes on his adolescent arm began to inflate massively and bulge out to the size of smooth round melons.
"Oooooh, you have NO idea how good this feels, lil bro!" It sent a chill through his spine to call his older brother 'little' and from the chill, a warmth spread through his chest and silky smooth tummy. His chest heaved and inflated out towards Nate, growing bigger and bigger with each breath the younger brother took. His tummy began to divide itself into six rounded squares, which seemed to contract and suddenly surge in size to match the now huge upper body.
Nate started to step back slowly, nervous to suddenly find himself faced with Chris' massive chest. But at the same time, his straining trousers let him know what he wouldn't admit to himself just yet, it was intensely erotic to watch this happen before him.
The young brother laughed with boyish glee as he watched his body transform into a toned and then into muscular physique, not meant for such an age. His legs started to inflate next. His thighs ballooned out in size, which started tearing the legs of his brother's now skin-tight shorts, which earned a giggle from the big boy. His calves exploded in size below him, bulging up to carry his newly improved weight, and finalizing his expansion..
Nate's eyes roamed over his younger brother's new body. He could not believe his eyes! and nor could he seem to tear them away from the herculean boy in front of him. Chris still looked like a young boy, smooth skin and not a hair on his body, but that made his unbelievable size seem all the more attractive.
Chris rubbed his big hands over his new muscles and flexed. Rrrrip! Nate's shorts tore another inch up the muscled thigh. "Oh wow! I don't even fit in your clothes anymore, bro! Mmm, I can't believe how strong I feel.. Come and feel my arm! ... Or maybe you'd want to try and wrestle again?!" " He calls to Chris with a smirk...
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