"Oh my god! Jon, you idiot, I'm your hand! And it's permenant!" Karyn tried to push herself away from Jon, but found her movement limited by the length of his arm, "Dammit, let me go!"
"I can't!"
"Well that's just great!" Frustrated, Karyn immediately dropped to the floor, sitting and crossing her arms over her breasts.
"Look, I'm sorry..." Oddly, looking at the place where his arm met Karyn's back, Jon couldn't help but notice the erotic appeal of his current situation, and out of reflex he reached for his crotch... apparently with Karyn.
Karyn noticed her hand suddenly reach around behind her and land on what must have been a very erect cock; she couldn't help but look at her arm like it had betrayed her... but Jon, at that point, was having an epiphany...
Suddenly feeling mischievious he explored his hand from the inside, and found that he somehow instinctively knew how to operate it as if it'd always been there! That made him even more horny than before, and before Karyn could figure out what was going on she was suddenly facing him on her knees and undoing his pants!
"Wait, Jon? Are you doing this!? Jon, what are you doing!?"
"Well, Karyn, you're my hand now, so..."