Mary pulled out the vial with the male symbol on it, examining it closely. She stared through the blue liquid as if trying to devine some great mystery of life. She figured if she was going to try one of these vials and it actually work, it'd be best to do something that kept her human, at least for now. And something easy to reverse. Before she could second guess herself, she uncorked the vial and downed the whole thing in one gulp. Wincing at the bitter taste, she placed the vial back in the box and waited for something to happen.
After a few moments she dismissed the whole thing and chided herself for believing in magic. As she went to close the lid on the vials, though, she noticed that the blue liquid she had just finished off had somehow managed to refill itself in the vial. She glanced at it for a few moments, scratching her head before she looked down at her hand in surprise. Her manicured nails were slowly shrinking, receding back into her hands which were rapidly getting larger and more coarse. She gulped and looked over in a mirror, seeing her hair slowly pull back into her head in the process. She almost shrieked at the sight, getting a bit more frantic as she watched her arms become a bit more muscular as well, with a light covering of hair appearing over them.
She grabbed at her chest, feeling her B-cup breasts underneath her bra, but she began to panic more when she realized that for a moment her bra was a little loose fitting. That quickly changed though, as her entire upper body began to get more muscular and her shoulders grow broader, even as her breasts disappeared into glorified pectoral muscles. She struggled to pull her blouse off, grunting as she did so, and then pausing when she heard her voice slowly deepening into a baritone range. She removed her bra before it could pinch into her expanded chest and kicked off her shoes just as quickly, watching as her feet began to grow larger as she also began to grow in height. Her face also began to change, feminine contours squaring up and a broad chin forming at the base of her mouth. A light amount of fuzz covered her face, not enough to really be a beard but enough to be noticeable.
She watched as her abdomen filled out, annihilating what little hourglass figure she had, and almost smirking when she saw the beginnings of a six pack forming in her abdomen. She pulled off her jeans as her hips shrunk down, taking her panties with her so she could see her lower body in its full glory. She watched her legs gain muscled definition, and felt her ass firm up into a masculine shape. Finally she watched in amazement and a degree of arousal as her vagina slowly closed up, her labia growing outwards and transforming itself into a scrotum, while her clitoris slowly grew into a fully defined penis six inches in length standing fully erect, as two grape size balls fell into her scrotum, completing his transformation. Mary...no...that wouldn't do...Mark stared in the mirror and down at himself in amazement. He glanced over at the vials and immediately thought he should take the female vial to transform back to normal. But a part of him simply wanted to see what it was like to be a man for a while. Maybe even take more of the male vial to see what might happen. Of course he could always try another vial too...