Gradually, Adam began to feel a strange tingling sensation creep over him. His whole body began to feel heavier, and his crotch felt weird - as if his prostate muscle was being held involuntarily clenched. He looked down at himself and was amazed to find that his already well-toned frame was becoming even better developed. Startled, he pulled his t-shirt off to get a better look.
He gasped.
His stomach was flattening and toning itself before his very eyes, while his abs were slowly but surely mushrooming into a perfet six pack. At the same time, his biceps and his pecs were growing improbably larger even as he looked at them. He could feel the muscles in his legs and arms tensing too, and realised that the same thing must be happening all over his body.
Caught up in the moment, he removed his jeans so that he could get a look at the changes in the full length mirror between his bed and Mario's. As he did so he gasped.
"Fuck!" he whispered and became instantly aroused as he saw that his boxer briefs bulging too - not only was his dick getting longer, but his balls were growing in proportion. Soon, his cock (previously, a modest four inches) was at least eight inches long and getting harder and longer as he watched. Soon, the rock hard member stood up past his bellie button - and all the while his balls kept growing proportionately.
He kept expecting the process to stop, but it didn't - his muscles kept expanding, slowly. His dick kept lengthening - seven inches, nine inches, twelve inches...
With a moan of pleasure, he grabbed his now massive shaft and started masturbating gently up and down, the continued growth of his dick making him more and more aroused...
Before he could climax, however, the process tapered off. He looked at himself in the mirror. He hadn't removed his boxer briefs, and stood there, like some kind of Greek god, muscular, but in an ultra-defined, rather than a built way, bulging out of his close fitting trunks. In short, Adam told himself, flexing his biceps, he was probably the most beautiful thing he'd ever seen.