You take the pill

Once you get back Jane practically mauls you in excitement.

"Take it! Take it!"

"Alright, alright, give me a moment. I think it says it's best to be naked when you take them."

You place the bottle on the nightstand. Jane grabs it and goes to find you a glass of water while you disrobe. There's a full length mirror in the room and you take a final look at yourself, wondering what the pill will do to you. You weren't sure if it was better to watch the transformation or not but you knew your curiosity would get the best of you.

Jane came back with the pill and cup. It felt like it weighed nothing in your hand. You look at the pill and then Jane smiling expectantly, you try and can't think of any reason to stall.

"Down the hatch"

You toss the pill in your mouth and chase it with a swallow of water. It tastes like nothing and at first you feel nothing. For a brief moment you think the pills must be defective. You look at your untransformed body in the mirror then at Jane. Then back at the mirror but now things were definitely changing. You watched before your eyes as your muscles deflated, all your features softened but where you attention was fixated on was your cock slowly shrinking. The actual sensation was impossible to describe, it was as if you were inside of a tight hole that was squeezing shut. It didn't hurt, it might even have felt pleasant if not for the shock.

You're changing before yours eyes. Your cock shrank down and down until it retracted all the way into your groin leaving you with a flat nothing. Your breasts and hips shift, throwing off your center of gravity. You think you can feel yourself becoming shorter as your hair becomes longer.

Just one change left and you can feel it before you see it. Your crotch splits in two shocking your whole nervous system as thousands of nerve endings burst to life for the first time. The strength of the shock nearly knocks you off your feet and leaves you stunned for a moment.