It occurs to you that you've never smoked a cigar before. There was something strange making it taste so good. Then you feel your belly getting bigger and bigger until it's the same size as the other boys' bellies.
The nurse explains to you, "Those are magic cigars which cause pregnancies."
"I'm a boy!" you say. "How can I be pregnant?"
"You see boys here who are pregnant, right? You're another of them."
"I saw girls who are pregnant too. Do the boys turn into girls?"
"No, those were girls all along, who smoked cigars. If a girl smokes a cigar she becomes pregnant. If a boy smokes a cigar, he becomes pregnant. It works on anyone, whether boys or girls. That's why you saw both boys and girls pregnant."
"I still can't become pregnant!" you say. "I don't have the right parts."
"You have just enough of the right parts to have a baby. The rest of you is still a boy."
You look down your own pants, which is hard to do given how your stomach is. You realize that your dick is gone and you have a cunt!