Your sister

While you and Gwen were never that close, she is family. Also, unlike your friends, she doesn't have a dick, and the less dicks there are around you, the higher the chances are that you'll be able to return to normal.

Snagging your phone, you shoot her a text.

"Hey, come home right now! It's an emergency"

Within a half hour, you her banging on your door, "John are you alright? What's going on?"

Well, time to reveal the new you. You open your door, "Hey Gwen, it's me, John"

Her face scrunches up in an expression of disbelief and exasperation. "Okay, real funny. Where's John, I'm gonna beat his ass for trying to play a cute joke and making me come home early."

Ahh, you should have expected this kind of reaction. You start to break down in tears as the stress of the day begins to hit you. I guess crying easier is another side effect of this body of yours. You manage to sob out a response to her

"No Gwen it's really me! Let me prove it, remember when I used to peak on you changing when we were younger? You have that birthmark on your inner thigh. Also that time I walked in on you and Allison making out, and there's also the..."

She stops you from continuing, worry evident in her face. Looks like the tears melted her heart of stone.

"Hey, calm down, stop crying. Shit you might actually be John, the hair and eye color is spot on. Sit down on the bed for a second and tell me the whole story."

She sits down next you on the bed, intent on listening to your story. You tell her how you woke up like this and have no idea how, best to leave out the mysterious phone call, magic, or your fertility for now.

Her face changes suddenly, moving from concern to...delight? Hmm, this might mean trouble of some kind. Gwen has always been a "forceful" individual. She puts her arms around you, massaging your shoulders, and brings her face in close.

"So now instead of John, I get a cute new sister instead? This seems like a pretty good trade-off if you ask me. Just out of curiosity, why'd you dress like a tomboy? You know I love that look. But what to do now, hmmm?"

Oh right, you'd forgotten about her "tastes" in women, and her loose morals.