Jon and Karyn got dressed. They had to borrow some of each others' clothes, as Karyn's shoulders were too wide and arms were too thick for most of her old shirts, and Jon's arms were too short and he felt uncomfortable with the way his breasts showed through his own shirt.
They went back to the clinic, and explained everything that had happened. The dark-haired woman nodded, and said that they had some experimental techniques that might be able to help. Before she could treat them, though, they had to sign waivers freeing the clinic from all liability if they weren't happy with their results.
The woman took Jon into the examination room, and another woman took Karyn into a different room. The procedure was familiar, except that the woman injected Jon with something from a hypodermic needle before she started. Then she began to masturbate Jon's penis, and just as he was about to orgasm, she shoved her fingers, hard, into the space between his balls and his asshole. A painful burning sensation flashed through Jon's entire body, seeming most intense in his balls and his nipples. The world spun and everything went black.
When he woke again, the dark-haired woman was standing over him. She smiled sadly and said "I'm sorry, Jon, but things didn't go quite the way we hoped - for you or Karyn. However, there are some other..."
Jon stopped listening to her as he sat up and examined his body. He gasped when he saw himself.