What happens?

You become a girl

You shudder as something washes over you, and when it passes you're different. You have long strands of brown hair hanging in front of your face, and it's down to your shoulders. You feel your face which is smooth, with no sign of the sparse facial hair that usually grows there. Looking down, you can see that your shirt has been replaced with a feminine one, pink and loose with a neckline that shows off the two decently sized breasts that are now attached to your chest. A pair of tight jeans cling to your legs.

"What the hell, dude?" you ask, your voice now much higher and clearly feminine. "What did you just put on me?" Jake shows you another one of the stickers, an interlocked design of the male and female symbols. You sigh. That makes sense, but... "What the hell?!"

"You said we should test them," he says. He sounds defensive. "I didn't think anything was going to happen."

"Well, now we need to change me back!" you say. You reach up to your neck and feel for the sticker, but can feel only skin. You freeze as you realize. "You need to take it off."

Jake thinks for a moment, then nods. "Yeah, okay..." he says, looking down at the sticker sheet for a moment. He looks back at you. "Move your hair aside?"

You stare at him, then brush your hair away from your neck. You can feel him shifting on his bed and then he...