a) laughing it up at her expense?
b) having a one-night stand wherein he caps things off by telling her that he isn't looking for a wife right now?
c) laying the foundation for a lasting marriage?
It should be noted that I've listed the possibilities in the order that most frighten Flapandhonk. She can take ridicule and was prepared for a royal mess; it's the idea that her filthy trick could backfire and produce something good that gives her the heebie-jeebies.
In any event, everything that happens in the immediate vicinity is all about her as this:
Panel 1: Elly screams that her brother is out somewhere with her best friend.
Panel 2: As she wears a groove in the floor pacing, she moans that she bets he swept her off her feet or took advantage of her vulnerability. In the original version of history, John, who warned her not to play with fire, is keeping his mouth shut because he doesn't want to get killed for saying "I told you so" or "What are you, their mom?" In the new-and-improved version, he's just found out why Elly is freaking out.
Panel 3: Her asking him how Phil could do that to his big sister would baffle him in any interpretation of events.
demonstrates. It never seems to have occurred to her that the world was not herself. Tomorrow's strip, which features Phil's refusal to kiss and tell, is a reminder of how vain, silly and filled with the desire to jam it to her fellows she is; she gets just as angry at him when he wants to be discreet as she does when he's honest.