Mary, annoyed that the Pizza Delivery guy turned out to be gay, turned back to the kitchen to rectify the problem. John, just stood there, watching. He was unsure of what was happening, it all seemed like some strange dream or TV show. He should complain to his manager, random ladies transforming him wasn't part of the job.
Once in the kitchen, Mary looks for the male vial. She spots it, opens it up and downs the entire contents. Mary puts the vial back down and walks back to John. With a forceful prod, she pulls him toward her room. "C'mon", Mary's voice has gone deeper. Her once soft feminine body shows signs of hardening muscle.
John looks at Mary in astonishment. She's becoming a 'he'?! Curiouser and curiouser, he thought. But, well, it looked like things were looking up.
The two make their way into Mary's room. Mary is now showing a lot of signs of transformation. She's gained a body of rippling muscle, as well as four inches in height. Her breasts flattened into two hard and well-shaped pects. And a big bulge emerges between her legs.
Mary, now completely male, stands in her (his) pink silk robe. John stares, wide-eyed at Mary.