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Gulping down the vial, Justin felt the taste of chemicals as the serum worked its way through his body. Immediately he began to feel a burning sensation in his chest.
His whole body felt like it was on fire. His muscles began to expand rapidly. His pecs, which previously were weak slabs of meat, filled out with extra muscle, pushing tightly against his shirt.
Justin flexEd his biceps as he felt the serum growing them. From his previous measurements his arms were small, but the now almost basketball-sized arms accompanied arms that were huge.
Looking down, Justin gazed at the previous lot fat-ridden haven that was his stomach. That was no more. Rapidly his midsection grew more muscular, his abs more defined. Eventually he sported the 6 pack that would make most men envy, with its hard slabs of muscle and high peaks.
Justin’s legs also grew, his sinew becoming more noticeable and his thighs growing considerably larger.
A few moans escaped Justina throat as he continued to grow. “Ah, man, this is incredible! I don’t want it to stop. It was at this time that he looked over at Amanda.
Her clothes were in tatters. Her previously small A cup tits had exploded into H cup behemoths that looked full of feminine milk. The were perky, likely not even needing a bra, and they were supported by the extra muscle Amanda gained in her pecs.
Her arms had ballooned in size, growing much beyond her previous limit. As she flex them her already dry struggling t-shirt began to rip even more.
Amanda now sported an Incredible 8 pack abs. Her slabs of muscle were like concrete, guarding her stomach and increasing her sex appeal tenfold.
Her growing things had almost rendered her shorts useless. The muscle sinews of her legs and calf’s became more and more defined.
Amanda moaned loudly and she grew. “Oh, Justin. We’re so big and strong and muscular. Fuck me right here.”
Justin looked at himself In the mirror. His body was heavily muscled now, with striations of muscle all across, highlighting his monstrous legs, brilliant pecs, hard 6 pack abs, beautiful biceps, and even his bulging cock, which was struggling against his quickly fading pants.
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