Zoe broke the hug, and pulled a small tome off her belt and looked Jen squarely in the eye and began chanting. Purple energy filled the air between them, and both of their eyes began glowing the deep purple color.
The changes started physically, as Jen levitated a bit off the floor. All the color drained from her skin. Leaving her a pale that was just barely not inhuman. Her hair also turned jet-black, many goths dye their hair but with magic enforcing the stereotypes Jen's hair was naturally black. As a feminist, her legs were unshaven, and her bush was as well. Shaving that sort of thing was simply for the Male Gaze, and wasn't something she wanted to do. As a goth however, being able to wear sheer or fishnet pantyhose and sexy dark panties were a higher priority, and as such her body hair vanished, and her pubes became well trimmed and neat.
Mentally things came in next. For a brief moment, she felt all the feminist conditioning go away, and she was exactly in personality as she was when she was a boy waking up this morning. But that wasn't to be, a sort of dark femininity crept into her mind. A sense of beauty in dark places. A sense of seeing the beauty in the world's destruction. Anger at the world for being the same and unchanging, at corporations for packaging happiness when only embracing sorrow can bring one true happiness... and most of all a sense that she must stand out from the crowd, to be herself most of all...
Remembering what Zoe warned her, Jen thought about what she was attracted to, and found women still enticed her... but also that those thoughts crept towards men. Goth men, mostly. But the idea of a big strong man sweeping her off her feet, embracing her for who she was... Yes, Jen was definitely Bi now.
Slowly the magic seeped away and Jen collapsed into Zoe's arms. "Is... is it over?" She asked of her sister, to which Zoe simply nodded. "Good." Jen said dusting herself off "I need a fucking corset! These clothes are so drab, so... NORMAL!" She said spitting on that word like it was an insult.