Mike pulled into his apartment's parking lot, and stepping out from his car, he felt for the first time a sharp, heavy tugging in his groin. Repositioning his balls, which seemed swollen in his jock, he left his workout bag behind and instead decided to head straight for his apartment to get ready for Rachael.
Entering the elevator, he could feel his arousal building, his dick fattening as it pushed against his crotch. "Fuck." he said under his breath, "They weren't kidding about that shit making you horny. I hope Rachael's on time."
Fumbling with the keys to his apartment, his cock having pushed its way out of his jock, hardening down his pant's leg, Mike cursed as he tried to open his apartment door, his urges causing him to rut himself several times against the doorframe. Finally opening the door, he stepped inside and flung it shut.
Immediately, he kicked off his shoes and pulled down his pants and underwear. His legs seemed bigger for some reason, however, as attempted this, his pants tight against his flesh. Freeing his cock finally, it sprung up against his belly with an audible SMACK, and with a glazed look Mike gave it several firm jerks, not noticing that his hand must have traveled nearly a foot from base to apple-sized head each time.
Shucking his shirt and his remaining clothes, all which felt plastered to his warm body, Mike strode to the bathroom, trying to control his desperate need to cum with the comforting thought Rachael would be arriving in roughly thirty minutes.
As he stepped into the bathroom and turned on his shower, Mike glanced at himself in the mirror. Pausing, he did a double-take. There were no questioning that changes had occured to Mike's body since ingesting the SES drink. He was taller now, much taller. Having been relatively short, he now was easily six and half feet in height. His muscle definition was different too, he had been toned, but now every striation from his butt to his pecs, from his biceps to his quads was clearly visible, straining his skin. Thick hair also covered his chest, his soft blond fuzz being slowly replaced by dark, ebony fur that seemed to be sprouting from his rapidly tanning flesh.
Jutting from his hairy groin, and what ultimately caught his eye, was indeed the biggest change for Mike. Having always been meagerly endowed, his shaft now looked like it could rival a horse's in length and soon in girth, its head seemingly misshapen, the glans flared and flatter. Mike's manhood's entire color had changed, becoming much darker than his tanning skin, and his balls had become nearly jet black. These too had grown, swelling to softball sized spheres, heavy.
Smiling at his arousing reflection, his hand now unable to resist the need to masturbate further, Mike failed to notice his pointed ears, which had lengthened further, and the stubby tail that was continuing to grow from above his ass. He also missed that his feet now seemed longer, and his middle toe was darker and more swollen than his others.