Afterwards... "Uhh, Steve? I think I have to use the john."
"I thought I was doing that," said Steve, laughing. "Anyway, too bad I can't use this thing to help you with that." He fingered an amulet on his neck.
"What?" said Jon.
"The amulet."
Jon sighed and muttered under his breath "I wish Steve would think he needs to give me some exposition."
"The amulet. You know the one that gives me the ability to change people's genitals and sexual orientation. You wanted to experiment, so you asked me to use the amulet so you'd enjoy sex with me."
Of course, when Jon made the wish that meant there was some reason why the thing he wished for happened. It was a bit of a strange reason, but then, Jon couldn't think of any other reason that could make a moldable penis at all possible.