Jon woke up feeling disoriented. It took him a few moments to remember where he was. He looked around and recognized the rather plain clinical examination room, and noticed that he was completely naked lying under a sheet.
He got up and saw his clothes neatly folded on a chair in the corner of the room. He pushed the sheet aside and hopped off the examination table. As he started to cross the room, there was a knock on the door, and the dark-haired woman stepped inside, once again wearing her lab coat.
"Ah," she said, "I see you're up and about again!"
Jon, standing halfway between his clothes and the sheet, covered his groin as best he could. The woman stepped up to him and gently pushed his hands away, saying "Sorry, but I need to take some measurements."
She pulled out a measuring tape and measured Jon's penis, pulling it out. She hummed and murmured as she measured his balls, his chest, his biceps and his thighs.
"Well," she said, "there is only a small change so far, but if you can make an appointment for tomorrow, we'll repeat the procedure. We'll try to do it once a day for the next two weeks, and then you'll see some significant changes, I hope. Just remember that you must not ejaculate until we've finished everything and we can stabilize you. Otherwise, you might accidentally set up a reverse channel and end up with quite the opposite of your intended outcome!"
Jon didn't quite understand what she was saying; he was far too flustered at standing naked in a room while an attractive older woman prodded and measured his body. As soon as she stepped out, Jon pulled his clothes back on and headed out. The receptionist stopped him and booked him for another appointment on the following day, and then Jon rushed out as quickly as possible.
When he got home, Jon decided to hop into the shower. As he walked past the mirror, naked, he pulled up short. He looked at himself carefully in the mirror - something was different. He examined himself closely, and although he wasn't sure, he thought that maybe his muscles looked a little more toned, his chin and body were just a little more hairy, and his jawline was just slightly more defined. He looked a little less like a boy and a little more like a man.
Nobody said anything about his appearance the next day, but Jon noticed that he was getting a little more attention from girls - especially those who had not really noticed him before. After school, Jon raced to the mall and returned to the clinic.
The receptionist smiled as he stepped in, and told him he was just in time. She ushered him into the room, and a few minutes later the dark-haired woman stepped in again, instructing him to strip. She repeated her strange procedure, putting on gloves, rubbing some kind of oil on her hands, and quickly masturbating Jon to a climax that came much faster than it should have. Again, she gripped his cock and balls with painful tightness around the base and jammed two fingers into his prostate just as he was about to come. This time, Jon didn't pass out, although he felt a sharp pain followed by an unpleasant warmth spreading through his entire body. He looked down, expecting to see his ejaculate sprayed all over the place, but his cock was totally dry.
He lay back on the examination table, feeling exhausted, and felt his cock go soft again. The woman covered him with a sheet and told him she would be back in half an hour. As Jon lay there, he felt waves of heat cascading through his body. He could feel his muscles tensing, and his skin felt funny. He lifted the sheet and looked at himself - this time, he was sure. He could almost see his muscles becoming more defined.
When the woman came back to examine him, her murmurings sounded more approving. She told him to come back again tomorrow, and left the room. Jon made his appointment and headed home.
After ten appointments, the changes in Jon were unmistakeable. Where he had previously had a boyish, relatively hairless figure, he was now covered in body hair and sported well-defined muscles. He had to shave every morning to keep from growing a beard, and most impressively, his penis (which had originally been a little on the small side) now swung heavily between his legs. It was fully eight inches long, flaccid - a fact he knew because the dark-haired woman had measured it - and must have been over a foot long erect.
Jon was spending more time checking himself out in the bathroom mirror every day. He also noticed that he felt more confident, almost aggressive, around women.
