What April didn't know was that her friends had changed as well, because of her wishes. At the mall the previous day, the fat man who they had laughed at had placed a curse on the four girls. One girl (in this case, April) would be able to make wishes come true and the other girls (Bets and Chastity and Diane) would be affected by them, even though they weren't the target. As it turned out, the wishes made about the first person (other than April herself) would also affect her three friends.
So now Bets, Chastity, and Diane were all short 15-year old scrawny gay boys with five-inch (fully-erect) dicks, shoulder-length hair, and an overall soft and feminine look. And all three former girls also now loved oral and anal sex - total bottom boys. And just like with April's brother Garret, everyone (except April, of course, since she's the one doing the wishing) thought that the three new boys (Bert and Charlie and Danny) had always been the way they were now.