This jacket is too good to waste it by tearing apart. Even if coach Jake is already the biggest man ever imaginable, it doesn't mean someone else won't benefit from gaining a lot more muscle. And fat.
“You look so amazing, coach!” Brody's gaze was glued to the image of a titanic overtly masculine Jake. Absent-mindedly he was already slowly stroking his own 6 inches. “You're always in that jacket, coach. It's your lucky one, eh?”
“It sure is, kid.” Jake replied. Brody is already a damn handsome and athletic jock. It would be better to make some scrawny geek wear the jacket to quickly bring him into shape. But it wouldn't be bad if Brody wears it for just a little bit? Push him a little further, give him a little boost for doing hard work in class. “Hey, wanna try it out?”
“Are you serious, coach?” Brody's eyes twinkled with stars.
“Yeah, for your excellent work on the field, you can wear it for a night.”
Feeling dry enough, coach Jake tried to take the jacket off, but even if it was no longer glued to his skin, it was still much too difficult with his simply wide and girthy he was right now.
“Let me help, coach.” Brody pulled up and helped Jake take off one sleeve. Unconsciously, the moment his arm was free from the tight confines, Jake flexed his biceps, which bulged into a massive, rock-solid ball of beef the moment fresh blood surged into it. The sudden feeling of his mount Everest-like peak rising made coach Jake spurt another glob of cum forward, while Brody was leaking drop after drop of pre from just inhaling the testosterone rich musk.
After flexing his peak a couple more times, coach Jake finally remembered and freed his other hand from the sleeve, then passed it over to Brody.
“It's so massive!”
“Put it on, boy.”
Brody wasn't a small guy in the slightest, but even on him the stretched to extremes jock jacket looked hilariously large, like an adult's winter coat on a little kid.
“It's so wet and rancid... I love it! But it's so big. I look stupid, coach”
“One day you'll grow into it, I promise.” Coach Jake remembered Ronnie’s words from earlier that day. All the jocks in school are far too invested in their chiseled physiques and abs and to coach Jake's disappointment, none truly want to pursue after him into the world of powerlifting. Unless the jacket helps him with it. Brody's got potential, right? “Listen, kid. Wanna know why it's lucky?”
“Yes, sir!”
“It was passed down to me by several athletes. It makes one grow as big as one desires. But there's a special ritual.”
“Oh, what is it, coach?”
“You have to cum, while wearing it.”
“Ugh…”
“Oh, come on, kid. We're both standing with hard-ons right now. Don't be shy. I already came all over your mirror.”
Brody took a look at the mess coach Jake made. The almost entire surface of the mirror was coated in white spunk and, yet, through the tiny clear gaps he saw himself wearing the comically-sized jacket. And in that very moment a strange feeling was lit inside Brody. The hunger for growth, the want to grow as big, as strong and as manly as coach Jake.
“I tell ya you'll grow into it.” Coach Jake gave Brody a good pat on the back, but not as powerful as the one before the party. “Here, go sit and get yourself comfortable.”
As if in some kind of trance, Brody followed coach Jake back to the couch and sat down. He grabbed his already hard and leaky cock and started masturbating. Slowly and gingerly, giving all of himself to the moment.
Coach Jake stood in front of him, sliding his gorilla palm over his own curved monster cock, feeling the mix of pre and cum between his fingers. He looked down at Brody and an idea gleamed in his head.
“Have you eaten today? You must be hungry.”
“Ugh… at school maybe? I don't remember, coach.”
“Oh, kid, you're disappointing me. How do you expect to grow big like me if you don't eat well enough?”
“Sorry, coach!”
“Well, you're lucky to have coach's protein straight from the tap!”
Coach Jake leaned down, one hand guiding his cannon, the other resting on the backside of the couch. Brody then drew closer too, placing his lips over the bulging cock head, right around the piss slit, and started eagerly gulping down the “milk”. Having a steady flow of hot, calorie-dense cum down his belly, Brody felt reinvigorated and only increased his jerking pace.
Having a new owner underneath, the jacket reacted with haste and used both its magic and coach Jake's protein to immediately start bulking the teen. Just like his favourite coach, Brody was destined to grow into a hulking beast of both muscle and fat. All of his muscles felt on fire, veins pumping boiling blood, spreading both his rapidly increasing natural testosterone and coach's cum nutrients through the growing body. His cock, which was already too hard, became painfully hard from all the blood surging into it. To keep up with the blood flow, the tissue itself began to grow and the dick was swelling right there in his hand, surging longer and thicker with every push and pull, while only increasing in its precum leakage, which was steaming down the shaft and onto his ball-sack, then staining the couch with a dark wet spot. To produce the required amount of testosterone, his nuts were swelling larger and larger as well. Due to coach Jake's immediate influence, Brody's cock too started to curve up towards him too, as well as his skin started to flourish a forest of fuzz, starting from his bushy crotch, down his thighs and up his belly, unseen underneath the jacket.
As Brody's manhood grew, his entire body followed. The biggest change was obviously his gut, as it was reaching near full capacity, while coach Jake wasn't even close to a climax. His body, stimulated by magic, tried its best to turn the cum into muscle, but his belly still took a heavy hit, losing its precious abs one row after another, while swelling forward into a hefty spare tyre.
Brody could feel his head surging higher both from his elongating bones, but also due to his growing ass, which was turning into a beautiful bubble-butt. His legs grew longer and thicker, feet skipping several sizes. He had to spread them more and more as the growth went on, just to not crush his big balls in-between his mammoth thighs.
Above his growing musclegut, rested a pair of plump pecs, which luckily managed to surge forward faster than his belly, creating a neat overhang. Brody's nipples weren't as sensitive before, but as his muscle tits grew, his nips and areolas followed, protruding forward and grinding against the fabric of the jock jacket, stimulating the horny teen even further.
Brody's shoulders spread further and further from each other, turning into cannon balls, while his arms filled the sleeves nicely with bulging biceps and triceps and thickening forearms. His neck grew wider, wider than his head, engulfed by two massive traps on each side.
Both coach Jake and his young student were drawing closer to their eruptions, moaning in deep voices and guttural roars. Brody was overfilled with cum and leaned away from the feeding pipe, spreading his wall of a back with wing-like laterals across the couch’s back. His belly finally outpaced his pecs and turned into a rock solid ball of fat and muscle with cum sloshing inside, filled to the brim.
In unison they came, coach Jake coating his student in white glazing, soaking the disgusting jock jacket with even more cum, while Brody shot many thick ropes all over coach's musclegut and pecs.
The feeling was so intense, that Jake couldn't keep his balance and fell back onto the floor, his voluptuous ass softening the impact, but still a powerful thud echoed through the building, akin to an earthquake.
For several minutes they laid on the couch and on the floor, legs and arms spread wide, panting like crazy, while their monster cocks slowly ceased their flow.
“Huf, uf… that… was… intense…” Brody mumbled through his heavy breaths.
“The first… time is… uf… always the best…” Coach Jake laid down completely, spreading himself like a sea star on the floor, his head going dizzy. “I think I'll… lay here, kid…”
Exhausted they both drifted off to sleep...