Chad looked feverishly around for the loincloth. This was getting too far! He wanted more hair and even more muscles but not to become an actual caveman! No girl would be impressed now! On the contrary, any hot girl would shriek and run from the ugly simian-like brute he now was! He could forget anything about a football career now! Who would hire and long-armed dim-witted brute? He couldn't even run properly like any normal human being! He wouldn't even be seen as a caveman! He'd be viewed as a new species of ape! He had to act before he was caught and made to spend the rest of his sad life in a cage in a zoo! Just imagining his old teammates and later their own children coming to ogle at him, throw him treats and make fun of him with tears of laughter in their eyes was too much for him to bear. They'd act like jerks and he would be helpless to stop them, except to grunt and howl and flail his arms around in anger, eliciting more taunts and jeers and with the knowledge that he would act no different if he was in their shoes. He had assumed removing the loincloth would turn him back. He was wrong but maybe putting it back on would do the trick? The chances were slim but he had to try anyway.
Alas, the loincloth was nowhere to be found and as he searched for it, Chad commenced battling conflicting thoughts within his mind. The loincloth was gone but should he cover his naked crotch while he searched still? On the one hand, it did not appear important. His virile member and testicles were dangling out in the open for all to see, for sure, but how could it be bad, let alone shocking? Everyone had privates or a crotch, right? Why was it vulgar or a problem? His human concept of nudity was already getting seriously eroded, and it was not going to stop. But for now, Chad, shook himself back into his human headspace. No! He was a human still, at least in thought! He knew showing off his crotch was bad! It was the only thing separating him from being an idiotic apeman! So in desperation, he rummaged through the Lost-And-Found bin. It contained not much, let alone what could fit him. His arms were too long and muscled, now. He did see a jockstrap, forgotten in the bottom and he fished it out. Better than nothing, and it did fit him. A little tight, yeah, but whoever it belonged to originally was muscled too so it worked out. A little relieved, Chad tried to forget the messages his brain sent him that walking around with his testicles and penis dangling freely felt a whole more comfortable and normal and went back to finding the loincloth. Unfortunately for him, other changes assaulted him soon afterwards.
Chad could not know that from his brutish caveman appearance, what he put on or not would determine his final shape. Putting on a jockstrap, the underwear of muscled and mighty sportsmen, meant he would transform into a gorilla, the mightiest ape of all. This before long Chad felt himself bulging with muscles anew and thick black hair erupted and elongated all over his body. His skin turned literally black and his fingers became puny and stubby compared to his large knuckles. As for his feet, they were now flat and with a big toe resembling a thumb for all intents and purposes. He became taller and broader. As for his face, the eyebrow ridges sloped downward even more and it flattened while his chin finished receding for good and a muzzle developed. What shocked him the most was his jockstrap, though. It... deflated. From barely containing his prized privates, it hung, limp and seemingly empty. With a simian grunt, Chad tore it away. His eyes widened. His penis! It was tiny! Nothing! Worthy of mockery in all locker rooms if he was human! And his testicles! Just as minuscule! His privates were utterly puny! Was it the normal size for the strongest, fiercest of apes that possessed a harem of females? He was a dangerous animal frightening and imposing and his crotch displayed the tiniest privates he'd ever seen? He'd need not cover them now! They covered themselves through their size, hiding in the fur and folds of his groin! What a joke! What a disappointment! In frustration, he started beating on his chest and growled and shouted. Naturally, all this sound attracted attention...