I'd barely begun to process what she'd just said when Karyn leaned in and began kissed me again. Having just had an orgasm, my penis was slow to respond.
Karyn stood up and for a second I thought that maybe she'd been teasing me after all. Then her jeans were laying in a pile on the floor, quickly joined by her shirt and bra.
I stared at Karyn, standing there before me wearing only a pair of green cotton panties, looking into me eyes trying to determine if I liked what I was looking at. She smiled while looking down at my penis as it slowly became erect again.
She turned her back to me and again I thought that she might have been teasing me until she slid her panties off exposing her beautiful backside. She looked over her shoulder at me smiling coyly. Slowly she turned and sauntered over to stand in front of me in all of her 18 year old glory.
I felt the compulsion to masturbate quickly growing to the point that I knew my hand would soon be moving on it's own. Before that could happen though, Karyn sat straddling my lap once again but this time both of us were naked. As we kissed, we both softly caressed the others' breasts.
Karyn slowly began to start grinding against me again but this time there was nothing to come between us. I felt every soft stroke of her labia back and forth along the length of my penis. I could feel the heat and moisture building in her crotch.
Despite being more aroused than I had ever been before the 'curse' was not forcing me to masturbate, which I was very grateful for. Karyn was moaning slightly in pleasure without breaking our kissing and that was helping to add to my arousal even more.
I was beginning to wonder how long we could keep this up before the orgasm I felt Karyn change her movements slightly then moan so deeply that she was forced to break the kiss. I realized suddenly that with that change in her movement Karyn had maneuvered so that as she slid back, my penis had slid into her vagina. There was no going back at this point.
Hot, hard and fast we rutted against each other. I felt my climax building when Karyn suddenly stiffened and cried out in pleasure. I felt the muscles of her vagina rhythmically clenching against my penis and this pushed me over the final hill and I came in her.
We stayed there on the couch for a long time. Karyn lay draped across me while the adult movie played, unwatched, in the background. Eventually she rolled to the side and sat beside me on the couch, resting her head on my shoulder.
"It won't be so bad being a girl, Jon." she said to me softly. "I'll be here to help you through this."
"Thanks Karyn, but I'm not really a girl. Not yet anyway."
"Oh Jon." she said, a hint of sadness in her voice. "You haven't noticed the change yet have you?"
"What change? I didn't feel any change." I said looking over at her.
"You really haven't noticed yet?" she said sitting up to look at my face. "I felt it when you came: I felt your penis shrinking away."
I immediately looked down at my crotch to see that what she'd said was the truth. My penis, that last part of me that was still male, was gone. I was completely a girl now.
