As soon as Katie got home, she did as the Chinese clerk told her. She headed straight for the bathroom she and I used and opened up my bottle of shampoo. She then poured the contents of the vial into my shampoo. After putting my shampoo back, she failed to notice that a drop of the potion managed to land on the side of her hand, just below her pinky. Without further thoughts on the matter, she threw the vial away and went to her room to read. (Only then did she remember that she had originally intended to go to the library).
I came home that afternoon from working out at the local gym. My parents were working so it was just Katie and myself in the house. The first thing I felt like doing was taking a shower to get cleaned off. I grabbed some clean clothes and headed for the bathroom. After getting in the shower, I took my time, making sure I gave myself the chance to relax and soak up the warmth of the refreshing stream of water.
I finally got around to putting some shampoo in my hair. As I was working it around, building up a lather, my scalp began to get warm. Soon it was slightly tingling, more of an annoyance than a concern. However, as I washed the shampoo out of my hair, my whole body was warm and slightly achy.
'I must have worked out harder than I thought,' was my rational. I got out of the shower and began to towel off. If I had been paying close attention at that point, I would have noticed that the room seemed to be getting bigger. There were other things going on that I should have noticed then as well. However, they would come to my attention within moments.
I had just about finished drying off when my sister burst into the bathroom.
"KATIE! What are you doing?" I was instantly shocked by the sound of my own voice.
"Oh my, oh my. It worked..." was all she managed to say.
"What worked?"
Without hesitation she grabbed me and shoved me in front of a mirror. What I saw made me scream.
I saw my sister, but when there should have only been one of her, I saw two. I had become the exact twin of Katie!
Katie was totally beside herself with excitement. From behind me she reached around and grabbed my new, somewhat small B cup boobs.
"John, you've turned into me! You even have the same size tits. This is amazing!"
"What's going on?" I cried.
"Come into my room. I'll explain everything while I pull out some clothes for you."