Jon tried to figure out how to make the situation less strange, then the idea hit him. "I've got it!" he smiled excitedly.
Speaking clearly, Jon made his wish, "I wish my vagina looked and acted like male genitalia".
Jon felt a pleasing warmth emanate from his crotch, as a familiar weight returned to it. He had his penis and balls back!
He reached his hands down, removing his boxers, which the panties had turned back into. He stroked his hand along his shaft, it felt a little different to normal, but Jon was just glad it was back.
With his other hand he had a small grope of his balls, which felt the slightest bit squashy. "Suppose its the best I could've expected" thought Jon.
The fondling and the effect of making a wish had caused Jon some arousal, his penis becoming erect.
Becoming lost in the moment of joy, Jon started to stroke his penis more, his hand slipping up, rubbed the tip of his penis, sending a wave of pleasure through him. It was far, far more sensitive than normal.
Jon continued to fondle himself, the pleasure spreading through him in intense waves, warmth taking over his genitals with the tip of his penis becoming moist. Reaching climax, Jon let out a deep moan of pleasure.
He expected a stream of hot milky fluid to come shooting from his penis, but nothing happened. He just lay there, drenched in sweat, having just had the strongest orgasm of his life.
~~~~~
After calming himself down, he wondered why it was so different.
"Ah, of course" thought Jon, realising why things were different. "Wishes can't be reversed, so my penis is technically still a vagina! The wish must've just re-designed it to be penis-shaped."