Maybe also written into the story, that Ethan/Emma, took each of his girl cousins in his/her arms, and kissed them good by/thank you for the prank/transformation. Its implausible that clothes would get into his DNA and alter the y chromosome into an x to go with the other x already there, but the perfume, once sprayed on the skin, seeps through the 7 layers of skin and into the bloodstream, that's where the change can occur. Even though both Mia and Lily were prankish they both didn't know this would really happen to Ethan, to change him into a girl/woman. LOVE THAT BOYS GETTING BREASTS.
Everyone is reluctant at first but love it in the end.
Maybe also written into the story, that Ethan/Emma, took each of his girl cousins in his/her arms, and kissed them good by/thank you for the prank/transformation. Its implausible that clothes would get into his DNA and alter the y chromosome into an x to go with the other x already there, but the perfume, once sprayed on the skin, seeps through the 7 layers of skin and into the bloodstream, that's where the change can occur. Even though both Mia and Lily were prankish they both didn't know this would really happen to Ethan, to change him into a girl/woman. LOVE THAT BOYS GETTING BREASTS.