"And now... for the rest. Yes, you're much better mannered than you were yesterday, like any good Japanese boy should be, and you are, a very good Japanese boy, you know."
You tilt your head, looking at the perfectly non-Japanese reflection in the mirror. You'd love to be cured, but now the man was talking nonsense. "I'm not Japanese, though."
"Oh, really? Well, you speak the language very well, I must say."
You suddenly realize that for the last few moments the conversation has switched languages to Japanese, and not only did you understand perfectly well, but you saw nothing unusual until he mentioned it. You make a move to respond in english, but it seems far to much effort to remember the right vocabulary and pronounce the words properly, and so you settle for Japanese for now:
"I don't understand, though. I don't look Japanese at all."
The loudspeaker speaks. "Well, that depends what you mean. Do you mean that you're not short enough? You look fine to me." And in the mirror you notice yourself shrink just a couple of inches, or were you always that way? It's so difficult to tell, with that persuasive voice speaking to you.
"Or perhaps you mean that you are fair skinned, but once again, I do not see a problem there..." And indeed, as you look in the mirror, even as you stare, the skin on your body darkens to a goldeny-brown, just like that of your brothers in the other room. Brothers? How can they be? Friends, perhaps. You feel better already about considering them as friends. The only thing that seems to have remained unchanged, oddly enough, is your still-hard cock, white as ever.
"As for your hair, well, I've never seen it so Japanese-black," and looking in the mirror, you are inclined to agree, and, you add to yourself, that's the way it should be... but...
You find yourself calling out "There's something wrong with my face, it's not Japanese at all" But even as you say it, you look upon a perfectly Asian visage in the mirror, with a striking family resemblance to your brothers in the next room.
You add... "And.. my.. my..."
"Yes, your manhood, or should I say boyhood, after all, you're no older than you were before we cured you. But by now you should know yourself how to complete the treatment."
Of course you do. You fall to your knees, gripping the only non-Japanese part of your body left, so aroused by the first part of treatment that it doesn't take much for the cock to erupt and spill its load onto your chest and the floor in front. And it keeps going, and going, expelling the very last of the white seed from your body as you twitch and howl with pleasure, your balls refilling with their rightful, Japanese sperm as it happens. Even as this occurs, the shaft darkens even darker than the rest of your entire body, and the skin loosens as you feel the presence of a generous foreskin sliding over your newly sensitive cock-tip. And then...
it is over. You laugh out loud with joy, you are finally cured, and you will soon join your brothers in spreading the news of how sweet it can be to be part of the family!