Stumbling with a sudden wave of nausea Sophie leaned against the side of the stall for support, vomiting over the side into the empty stall on the other side. Hot pulses ran through her body in tandem with her rapidly beating heart, her skin tingling with goosebumps. "Uungggh... shit, w-what's happening...".
Managing to stand back upright Sophie wiped the sweat from her brow, "Unggh... so sweaty, what did... did that damn rock do to me?". Her clothes felt tight, too tight, her overalls clinging to her sweat slick skin, as her muscles burned with pain.
Releasing the clasps at her shoulders Sophie let her overalls drop to her ankles, sighing with relief at the cool night air on her bare skin. Leaning down she fumbled to get her boots off, removing one but falling back with a soft thud, cursing as she struggled to remove the other.
Her boots and overalls removed, Sophie was left clad in only her black underwear, having forgone a bra in her earlier haste. Examing her body Sophie was horrified by what she saw, her mouth agape in shock for a moment as she took in the grotesque metamorphosis occuring before her eyes.
Sophie's entire body was beginning to bulge unnaturally, new muscle and fat slowly forming beneath her taunt skin as her body steadily expanded. Sophie's breasts were already beginning to sink into her broadening chest as she stared, unable to take her eyes off her changing body.
The worst yet to come Sophie finally let out a guttural scream as the pulsing intensified in her crotch and her panties began to bulge outward as they struggled to contain what lay within. "Is... Is.. IS That A COCK?!" Sophie yelled in horror, quickly getting her answer as the fabric of her underwear gave out, tearing and falling to the side as a massive flacid penis sprang free, flopping onto her barrel-like belly.
No human penis Sophie immediately recognized the bestial member for what it was, bolting upright she tentatively poked the steadily swelling sack that hung beneath her new equipment, unable to even speak, she gulped, finally realising what was happening to her body.