"I'm very pleased with these results Justin," Ms. Heather said, flexing her impressive new arm. She was practically drooling over her new biceps.
Justin was speechless. The hottest teacher in the school had just gotten the body of a fitness model and was showing off right in front of him. He felt his pants grow tight at the sight of her biceps popping, and the strain her dress was clearly under from all her new muscle mass.
"Well, no sense in delaying further tests" she said, moving back over to the other vials.
Justin finally spoke, "Wait, we haven't gotten your measurements for the first experiment. And we don't know how the two formulas will react when combined with each other. And..."
Ignoring Justin's protests, Ms. Heather giddily picked up the red serum. Her breath was shallow with excitement and she could feel her heart pounding in her chest as she downed the whole vial. If tasted like licking an ashtray. Soon that didn't matter though as a wave of pleasure hit her like a freight train. She nearly had an orgasm from that alone. She felt her muscles tensing, pulsing, and bulging. Her heart rate quickened as veins stood out against her skin, bringing blood to her growing muscles.
Ms. Heather doubled over, grabbing a nearby table for stability, but as soon as she had done that, her forearms bulged menacingly with thick, vascular muscle. Cracks appeared in the table where she gripped it as the growth moved up her arms. Her biceps and triceps bulged and throbbed. With each pulse they retained some size, eventually growing to create a horseshoe shape on the back of her arms several inches thick, and a split bicep peak t.
The rest of her body was not to be left out, and her shoulders and back quickly thickened with incredible amounts of lady beef. Her back was covered in mountains of muscle, with valleys and craters between. Her Lats flared out so much that the sides of her dress tore. Her back was so wide it looked like you could land an airplane on it. The clasp of her bra snapped open, but her boobs were still held perky by her incredible back, and rapidly expanding chest muscles. Flexing her chest, all the lines of definition made it looked like crumpled metal. Even her neck grew thick, veiny, and muscular.
Her lower body was also growing. Her calves, already well defined, began to look like heart shaped cliffs against her legs. Her thighs fought for space as they swelled up, straining against her stockings until small tears began to form. They continued growing, leaving her stockings as mere tatters clinging to her godlike legs, each one as thick around as a barrel.
"Oh fuck! That was incredible! I've never felt a rush like that in my life," Ms. Heather said, catching her breath. She tried to sit down on a nearby chair, but it simply collapsed under her immense new weight. "Oopsies," she said with a giggle, flexing one arm.
Standing back up, Ms. Heather flexed every muscle she could, enamored by the sight of her body, and the feeling of sheer power that she had. She had always wondered what it must be like to live life in a body with such strength, such power. She finally had her answer. It felt divine!