Apparently Karyn's wish only changed Jon's body and his taste in clothes, but not his feelings towards Karyn. Jen didn't think that Karyn would like him now that he's a girl, so Jen grabbed the stone and said "I wish Karyn would feel about me the way I feel about her." Now, it seems, that Karyn will have those same feelings for Jen.
Karyn smiled at Jen, walked over to her, and kissed her.
