At first, Alex didn't really notice the changes that were happening to him. But after the third day, he noticed something. His nipples seemed to be bigger, as did his chest. He also noticed that he had lost some of muscle mass and that his penis had become smaller. He wasn't just imagining these things, though. He knew that he was different. He just didn't know how or why it was happening to him.
During school on the fifth day, Jon passed Alex in the hall. It may not have been noticable to anyone else, since Jon had wished that only he and Alex would notice the changes, but Jon definitely saw a change in Alex's appearance.
Alex usually wore a tight shirt, to show off his masculine physique. But now, it wasn't showing off his muscles. It was showing off his breasts. They weren't very big. Maybe size-A, but they were still breasts. And as Alex walked through the hall, he seemed uncomfortable. Maybe it was because his clothes weren't fitting right, or maybe it was because he knew that he was becoming a girl and he couldn't stop it.
Jon smiled. His plan was working perfectly. In another couple of weeks, Alex would become Alicia, a beautiful buxom blonde with size-DD breasts. And then after that, become Jon's subserviant girlfriend.