Karyn didn't know it, but since shortly after puberty Jon had gotten used to masturbating in the morning, it was part of his daily routine now. And frankly, the few times when he forgot or was in too much of a hurry to do so, he found that he couldn't operate correctly during the day until he'd done so, as if his body required it in order to function right.
This morning, though, Jon was preparing for Karyn to be ready for something a lot more interesting than masturbation.
And then there came that interrupted wish, and now... well, Karyn was willing, and he was able, and both were quite ready.
Indeed, unknown to the both of them, part of the package of instinctively knowing how to control his hand was that he also thought of that body part as being what it was, his hand. Oh, he hadn't forgotten that Karyn was Karyn, his best friend and a separate individual in her own right, but she was also his hand now, and because of that she was no longer a separate person, she was a part of his body.
And as a result of this subconscious perception, Jon truly didn't make the connection that what he was about to do would be actual sex. After all, Karyn wasn't a real girl, she was a hand that looked, felt, and perhaps even thought and acted like a girl. Thus, when he'd thought to himself that he was going to masturbate with a real pussy, he wasn't kidding. He was masturbating, with no more innate significance to the event than there had been to it before his mis-announced wish.
Karyn, for her part, was having trouble with adapting to what was going on in her own mind. She didn't mind being Jon's hand, which meant that she was in a way essentially a slave to his every whim no matter what those whims might be, but she knew that she SHOULD object to what was about to happen. After all, a girl's gotta consider her honor! Her purity! Her virginity!
Except, she realized, her honor, her purity, and her virginity weren't really hers anymore. After all, Jon was the one with the identity here, she was merely a hand. And beyond that, even though physically her body would have been... well, not virginal anymore, technically she still would be; in essence, she was already foreseeing and perceiving the coming event with no more anticipation than as if she were about to use a very, very complicated dildo.
And unknown to either of them, the rest of the world shared these feelings. Karyn was Jon's hand, there was no more significance there, that was they way that Jon had always been. Some of the guys in his class and age group were sorta jealous, and a few of them had even made moves on him, seeing if they could get Jon to allow them to date his hand, and in at least the one incident when Karyn HAD gone on a date before the wish, Jon had agreed, albeit reluctantly.
No one was entirely sure how such an... odd arrangement had come about, but Jon had always been of two minds. After all, his primary form, his male body, didn't do much cleaning, didn't care all that much for cleanliness, and generally acted like a guy, yet his hand, at his direction, had learned to be a girl, she liked being pretty and attractive, she did all of Jon's cleaning, and always smelled and held herself as a girl should, and when she talked, she talked and acted like a girl.
And Karyn was Jon's hand. And she always would be. And thus, as odd as it was, this was perceived as normal, even if only in this one case.
