I quickly hurried over to the source of the sound to see Sam struggling to pick up one of the 15 kg weights which had been dropped on the ground. "Stupid... Weights... Too... Heavy..." Sam grunts as she barely puts the weight back on the shelf. She looks over at the smaller weights and sizes up one of the 5 kg weights. Picking up one of the weights causes her arm to tense up, revealing truly how scrawny she is. "Shit, she almost looks unhealthy like that," I thought. Maybe it would be nice if she at least had a little bit of meat on her bones. Looking closer you begin to notice that her reps are beginning to get faster until she plops the weight down with ease. She has a slight grin on her face as she looks back at the 15 kg weight.
As she tries to pick it up with both hands, her muscles begin to flex a little again, this time though with a tiny little bump to her biceps. Feeling slightly aroused by her newfound muscle, I snuck up behind her and gave her curvy body a tight hug, pressing my meat into her upper back. She gasps a little when I give her boob a squeeze. Although she may have a little bump on her biceps, I can still feel the bone under her arms. "How's your little workout going, huh?" I tease her, still wrapping my arms around her. "It'd be going much better if you weren't being such a creep and trapping me like this," she says with a snotty attitude.
"Maybe if you had some muscles, you wouldn't need to worry about me trapping you like this." She looks at me annoyed and grabs my arms trying to release them from my hold around her. At first nothing budges, but then I begin to feel my grip getting tighter. Her grip continues to get stronger and stronger until finally she slips out from under me. "Hah! You're not such a big guy after all." I look over at her standing all triumphantly, but most notably her upper chest and arms have grown at least a couple of inches in diameter.
"Come on, I wanna try on some work out clothes now." She says, dragging me to the dressing room. Along the way she snatches a couple of extra large crop tops meant for bodybuilders. I'm puzzled by this, "is she even going to fit those?" I think to myself. Since there weren't any employees watching the dressing rooms, we both grab a stall to ourselves. "Close your eyes, if I catch you peeking I will beat your ass," Sam says, grabbing one of the extra large crop tops. I comply and close my eyes. "Just imagine," Sam starts "I saw you eyeballing these crop tops I grabbed, imagine how amazing I'd look in them if I were to work out for the next few months. I could grow into them, maybe even outgrow them..." This fills my head with pictures of Sam lifting weights, getting bigger and bigger, lifting heavier and heavier weights. Her giant boobs beginning to press up against the fabric as her pecs swell. She would look so hot with all that muscle on her. "Alright, open your eyes, what do you think?" I open my eyes and am just stunned seeing Sam with shoulders half the size of my head and an 8 pack showing through the now stretched crop top. She posing standing on her toes to make her look taller, now coming up to my nose in height, probably growing a couple of inches total.
"You, uhh, look amazing Sam," I stutter, still in shock from her new appearance.