"Is it my turn with the wishing rock again?" Jon asked.
"Oooh, well," Karyn begged, as she caressed one of Jon's giant balls. "Couldn't we ... have a little fun first? On our own, without the rock?"
"We do that every night, Karyn. It's not every day that someone gets to make a wish."
"Okay, fine," Karyn pouted.
Jon grabbed the wishing rock and walked out of the room, constantly getting smacked by his own humongous penis, which he still didn't see as being strange.
After a minute, he came back in, seeing that Karyn had definitely changed.
"What did you do?" Karyn asked. She really didn't even notice.