"Jenny," said Gary, "I order you to not have sex with me tonight."
"Huh?" said Karyn, who had been listening.
"It's simple," said Gary. You can't contradict an earlier wish with a later wish. I made an earlier wish that Jenny cooperate with me. Jenny made a later wish about having sex with me. All I have to do is give her an order that makes the later wish contradict the earlier one.
"But you told her that later," said Karyn.
"Yes, but the wish itself was earlier. And the earlier wish wins."
Gary no longer felt as attracted to Jenny as he did before. He still did to some degree from the aftereffects of the marriage wish, but the overwhelming desire that he sleep with her before the end of the night was gone.
"Hi, guys," said Biff. He was wearing his regular clothes and carrying a cheerleader uniform and fake breasts bundled up under his arm. "Now I understand what the girls have to go through when they do it at our games," he said. "And I'm glad you won, Mom."
Gary muttered "Mom?" with puzzlement, until he realized Biff was talking about Jenny.
"Yeah," said Biff. "Didn't you say I could call her 'Mom' once you two got married even though we're the same age?"
Gary sighed. Well, most of the wishes weren't causing problems. But he still had the marriage to deal with. There had to be something he could do with the stone to help....