Once they got home, Jon was surprised to see that his father was also now over six feet tall, slim, athletic and muscular. It was fairly obvious that his father also now sported a rather large and impressive cock. Jon wondered if his mother had also been affected by his earlier wish. The thought didn't bother him too much. He was pretty laid back these days.
He went to his room immediately and closed the door behind him. On the way home, Mikey mentioned that he was really horny, and that he was now so much older physically than all of the girls in his class (due to his unusual growth spurt and early onset puberty) that the girls wouldn't go near him. Jon felt bad for him and told him not to worry. Jon suggested that they go to the mall after they got home, and try to pick up some girls closer to Jon's age. Jon had figured that it was high time he got laid. Even if Karyn had memories of the two of them fucking, Jon didn't yet. And he didn't really want to wait another week before he had a chance with Karyn.
So when he got up to his room, he pulled out the rock and made a new wish: "I wish that Mikey and me were great at seducing women, and that all women over 16 were extremely attracted to us. I also wish that we were great in the sac."
Unbeknownest to Jon (even though he should've guessed what was going on by now) his father was also affected by the wish. Fortunately Jon's mother was out shopping, otherwise she would've been affected as well...