"But Karyn ... I don't know the least bit about being a girl, or a lesbian."
"Let me teach you, okay? But before we do that, let me make a wish." She grabbed the stone from Amy (Jon) and said "I wish that Jon has always been a girl named Amy and we've been friends for a long time, but the only reason that we are now dating is because Amy has just revealed to me that she is a lesbian and I have just revealed to her that I am a lesbian as well."
Amy suddenly had a slight mindshift. She "felt" more like a girl, like she was used to it, even though she had no memories of her "new" life. But she did remember her name as Amy instead of Jon, even though she remembered that she used to be a boy.
"What did you do that for?" Amy asked.
"I just thought it would make things easier. This way your family and friends will remain nearly the same. They won't think that you're a stranger, like I did at school."
"Oh."
"So, are you ready for me to teach you on how to be a lesbian?" Karyn asked, eagerly.