When Athena (in Steve's body) finally got back to Steve's house, he immediately went to his room. It felt good to take revenge on Jon, but it didn't really help his situation any. He had the stone, he should have used it to fix his situation. But his mind was only on one thing at the time: revenge.
Although, getting back to normal wasn't too difficult. All he'd have to do is have sex with a girl three times. He nearly cringed at the idea, since he was really a girl, mentally. But having sex was a small price to pay to change back to normal.
So, he thought. Who should I do it with?
He tried to think of the girls that Steve would be with and came up with Sarah Taylor, one of the Taylor twins. Her sister Jennifer was a little more of a band geek, not someone that Steve would socialize with. Although, given Steve's reputation as a ladies man ...
So, it was settled. He was going to Sarah Taylor's house. Soon he'd be back in his old body.
Steve (in Athena's body) walked up to Kevin Cooper's house. She remembered Athena being with Kevin on more than one occasion. Of course, that was a few months ago, before their "break-up", but at least it was someone familiar.
She rang the doorbell and moments later, the door opened.
"Athena?" asked a surprised Kevin. "What are you doing here?"
She walked in, pushing Kevin aside. "I came to talk to you about something."
"You can't be here. I ... I'm busy."
"Too busy for me?" she asked, before walking upstairs.
"Athena, don't go up there," Kevin said, following her up.
She saw only one room with lights on and assumed that it was Kevin's bedroom, so she opened the door and walked in. A girl was already there. She recognized her as Amy Crissman, one of the high school newspaper reporters.
Kevin darted in and apologized to his girlfriend for the interruption, then told Athena to leave.
"But I want to have sex with you," Athena said, bluntly.
Kevin felt like his world was coming apart. He had finally convinced Amy that there was no longer anything between him and Athena, and then this happens.
"I don't mind," Amy suddenly said.
"Huh?" To say Kevin was confused would be an understatement.
"Yeah, I'll just sit here and watch." She wasn't being sarcastic. She really meant it.
"You could join us," Athena suggested. Steve (who was still inside Athena's body) wouldn't mind that at all.
Amy smiled and said "Sure." Athena walked over to her and they began removing each other's clothes, occasionally kissing.
Kevin could do nothing but stare. What was happening?
What Kevin (or Steve, Athena, or even Amy) didn't realize was that after Jon was confronted by his sister about swapping her personality, he felt a little sorry for what he put Athena and Steve through. So, he made another wish to make the solution to their problem a little easier to deal with.
In this case, Kevin didn't want to have sex, because his girlfriend was there. But if she suddenly was okay with it ...
The wish basically changes reality to force the situation to happen. This way, Steve or Athena wouldn't have to make people have sex with them. Reality would change itself so that sex with them would definitely happen. Of course, after the sexual act was over, reality would still be changed and wouldn't go back to normal.