Just before they left the shopping mall, Peter, still in the shape of a muscle god, caught himself looking at some of the clothing stores. He was much to big for any of the sizes they might carry, but that didn't distress him; in fact, he had to admit now having Joce change his shape so often, he enjoyed the idea of bursting out of constrictive clothing just by his growth alone. It had never hurt the few times that Joce had let him such rapid growth; by the time he'd gotten to the breaking point of his gym shorts and speedo, he was so muscled and large there hardly any pain at all.
Joce tried hard not to grin and blush at where Peter's mind was going. She had sort of listened to his thoughts as the left the crowd in awe, enjoy how confident he felt about himself, but to hear that Peter was enjoying this possibly even more than she was make her temperature rise. The very images Peter was thinking up of him 'hulking-out' of his own clothes was almost too much for her to take without doing something right then and there. Even his own weird ideas of an expanding stomach to the point of sumo size to burst open his shirt excited her. She realized she loved Peter no matter what shape he was; just the idea of him GROWING in some way excited her.
"Peter, could you wait right here for a moment? I'll be right back." Before he could even question what she needed she darted off into the big discount store.
He blinked, confused, before reddening. 'Duh, she read your thoughts! She probably got scared off by the idea of he boyfriend wanting to grow his stomach out to rival an elephant, just so you could watch your buttons burst.'
'An Elephant, eh? I was thinking Sumo wrestler, but that sounds even cooler!' Joce's tone abated Peter's fears. She liked him any size.
A few minutes later Joce came out, dragging a giant bag. Peter lifted it easily off the ground. "Thanks!"
"Hey, that's what boyfriends are for-" Peter was cut off as he suddenly found himself back in Joce's barn. Now he really was confused.
Waiting for Joce, he began looking through the stuff she'd bought at the discount store. A couple of extra large sweatpants, a dozen white t-shirts with so many Xs and Ls on the label he was sure they could be used as picnic blankets instead of clothing, and...
An air tank?
But as Peter brought the tank closer to his face to read the label, the words 'air tank' became 'muscle mass tank'. Even with excessive strength, he could feel the tank become super heavy, and nearly dropped it on his toes.
Joce's voice resounded in his head, 'Good! It worked! Now, before I get there, put on a pair of the sweatpants.'
He heard Joce pull up to the doors a minute later. She grinned at the sight of Peter, blushing in the loose sweatpants. He'd flexed of the t-shirt he had been wearing, much to her delight. She may love Peter in any shape, but muscle mass suited him really well. "Looks like someone is happy to see me...."
"Well, yeah I-" Peter stopped mid sentence as he felt the tingle of transformation concentrate in the center of his body. Well, slightly lower...
Peter's eyes widened as his entire package began to swell. First it looked like he had grapefruit stuffed in there, then a football. By the time the the objects were the collective size of a basketball, Peter could see the distinct shape of his python cock and swelling balls under the tightening fabric. He grabbed each ball by his size and enjoyed the expanding flesh under his fingers.
The sweats had tried to slip down to accommodate, but the size of the combined bulge, pushed forward by his already huge thighs was too big for the waistband to handle.
Peter groaned with satisfaction he wobbled under the weight of the largest package on earth. It looked almost like he had a sewer pipe and two medicine balls stuffed in his pants, but the throbbing veins that stuck out under the fabric told otherwise.
The fabric now creaked under the pressure; it was at its maximum limit. Peter looked to Joce, waiting for the last surge.
Instead, she stood, lips puffed with arousal, and her shirt unbuttoned to reveal the black lace bra she wore underneath, playing through the lace, excited by his growth.
That sight was all Peter already overloaded hormonal system seemed to need. Already semi-hard from the rush of transformation, Peters cock acted like a hose suddenly attached to an open fire hydrant. It swelled and stiffened, and the sweatpants disintegrated under the force.
Peter collapsed to the ground as the adrenalin rush wore off. his package shrank back to a respectable size, its mission completed. The sweatpants were rags now, strewn about the floor. Joce giggle.
After they both recovered, Peter grinned at Joce. "What's with the air tank?"
"Well, two things. I wanted to see if I could change something inanimate you were holding. I can only change you, but as long as you're holding an object, I can alter it to fit our needs, like your clothes. Second, changing you while trying to get an eyeful is distracting. I know you want to bulk out, so that 'muscle tank' will let you determine how much you want to fill up, while I sit back and enjoy." She wiggled a eyebrow seductively.
Peter rubbed his stomach absently. He'd imagined it full of water or food, but a massive muscle gut sounded rad....
Joce giggled, "But we've got a lot of other things rip and shred too! What'll it be?"