Jon wishing karyn back into a woman

"Karyn, maybe I could wish you back into a woman." Jon said. "but Jon, wishes are not reversible" She said. "Maybe, but my last wish undid your hair and breasts that the very first wish gave you so their must be a way" Jon said. "I wish I had a magical device here that could turn karyn back into a woman." Jon said. As jon said that a device looking like a miniature ray gun small enough to be held by only two fingers appeared. "Oh jon... I can't wait to be normal again." Karyn said. Jon held it, and for a second hesitated. If he does this would he have any penis at all? If he does this would it undo his last wish that made karyn be more like a real penis?