Lee Roberts noticed the day the TG flu first affected him, a few days after his 17th. When he pulled on his shirt one morning, it rubbed against his nipples, and he realised they were sensitive and had swelled. He felt too embarassed to tell anyone, so he kept it to himself and hoped it'd go away on its own. Unbeknownst to him, it never would.
Soon he got used to it, and realised it had an upside- now when he played with his nipples, it gave him a lot of pleasure. So when he masturbated, he got into the habit of playing with his chest more. But slowly he noticed his chest seemed to be swelling too. He would've assumed it was just that he needed to lose weight, but if anything he seemed to be thinner lately.
As time went on he noticed more changes. His skin seemed softer and smoother, his body hair less pronounced. His face seemed different, with rounder cheeks and puffier lips- his friends asked if he was using chapstick or something. He noticed his muscles seem to shrink and his figure get more petite, and his figure seemed to change as his shoulders got narrower and his hips wider. Eventually he began discreetly wearing girls' jeans and hoping no one would find out.
Eventually the changes got very dramatic. He noticed when one day the bulge of his larynx had vanished from his throat and his voice sounded way higher pitched, and gradually his chest continued to swell until he had unmistakably formed breasts. Even in his head things felt different- he kept instinctively thinking of himself as her, and seemed more connected to women and attracted to men.
One day something happened Lee couldn't ignore- he woke up early with an irrepressible need to go to the bathroom, and bled from his penis. He instantly called the hospital and took a sample to them, and after a day or so to examine it, his doctor gave him the conclusion. The blood he had bled was strikingly similar to mensural blood. Having heard about his other changes, they theorised that his body was going to give him a period to complete the change from male to female.
Lee wanted to think that was ridiculous, but he had seen enough to realise that it was very plausible. The hospital asked for various samples of his, and offered to keep a semen sample, guessing that the impending loss of his manhood would probably be upsetting to him. While he jacked off for the last time, he felt very heavily reminded of how female he had become- he had to play with his tits to cum, and he fantasized about a handsome man fucking him.
A few days later the last change took effect. It had been building for a while, as his penis had shrunk considerably and his testicles had transformed into ovaries, but over the course of one night things finished up. First the small nub of his penis reached its final tiny size and became a clitoris. Next his ovaries moved up inside him, joining up with a vaginal tract and womb that had formed inside him. Soon after his scrotum receded to a small mound while down its centre it unsealed and vaginal lips formed around a slit reaching inside his body.
Now his body had completely changed, his mind finally changed to fit- the name Lea came to her as a feminine alternative, and she finally felt comfortable with female terms like she, her, girl and woman being applied to her. After all this time, Lea's struggle was over, though for many other people it would be just the beginning.