Steve grappled the delivery girl to the ground, kicking the door shut with his foot. He buried his muzzle in her hair, taking in all the scents on her with his new nose. Her herbal shampoo, the smoke from the cars along her route, even the faint traces of that hot dog she grabbed for lunch. The young woman was panting, a sharp acrid scent from her that his mind some how recognized as fear along with something else, almost flowery. It was arousal.
"You want me?" Steve's voice was more gravelly than before, but he looked at the young woman, barely keeping himself back, she simply nodded.
He shredded off her clothes, leaving her body bared. She had pert b cup breasts, and an athletic figure, her long brown hair barely brushing her shoulders. He looked her over, feeling some arousal, but something was just off. He spread her legs, penetrating her with his red shaft, a few thrusts of his hips and he knew something was wrong.
He remembered his wish, that he was gay. Then a thought drifted to the surface of his mind. Sticking a finger into the still open bottle of cream, he spread some on the young woman. "I wish you were a man."
The woman began to thrash, howling, "I don't want to be a man!" He was pushed out of her as he vagina began sealing itself, and he felt his own arousal returning full force. Pushing her legs up he instead rammed his cock into her ass, a loud squeel coming from her. He began his rhythmic pounding as the skin where her vagina once was began to distend, pushing outwards from her body in an empty sac. Her clit began to swell, forming into a familiar shape as it pushed away from her body, a veiny shaft protruding from her crotch, hard and throbbing, a good eight inches long. With a groan the deflated sac under her new penis swelled as two orbs dropped into it.
He felt her pelvic bones shifting as he continued to thrust into her, looking down in time to see her hips beginning to shrink as her waist pushed out. The widening of her torso followed up to her shoulders, her body beginning to stretch out as she gained height. Her body was no longer a slight hourglass, instead it was now the distinct v-shape of a man.
Still gripping her legs with his hands he felt them growing larger, the muscles in them flexing and unflexing as the swelled, the bones making soft cracking noises in his ears as they began to lengthen. The bouncing of her breasts in rhythm with his thrusting began to slow until the stopped giggling at all, the soft flesh having disappeared. Her nipples began to shrink down as he chest slowly mounded out again, this time with two plates of muscle. Her already taught abs began to define even more, forming a definite six pack. Her arms started lengthening as the muscles swelled, her biceps and triceps swelling the changes moving down her forearms and her hands nearly doubling in size, as he was sure her feet had done as well.
The changes began to progress up her face, which instead of terror was now locked in an expression of agony mixed with pleasure. Her jaw widened, becoming more squared as her nose became more pronounced. Her whole face just became harder, she still had traces of her own face, but she would be taken for her old self's brother.
The hair around her new crotch began to thicken, growing outwards. It came back to a point, spreading up her stomach to her navel and then up towards her pecs. A light carpet spread across her chest, just short of bearish. Hair began to travel downwards along her legs as well, lightly on her thighs, and the more heavily as it went down until it passed out of Steve's vision. Hair began to thicken on her arms, patches growing in on her underarms. Steve also felt some brushing against his cock as he continued to push into her. A few days stubble formed on her chin and jaw. Now she was just about six feet tall, and athletic looking. Almost bearish but not quite, her whole body just radiated masculinity. She squeezed her eyes shut, her new cock pumping her first load of cum into the air, some splattering her hairy chest, some hitting Steve in the muzzle. The clenching of her muscles drove Steve to his own orgasm, driving into her as his knot swelled, pumping her full of his doggy semen.
With a sigh Steve collapsed on the now delivery guy, nuzzling his muscled chest. "So, what's your name?"