@TNT261 Nah, it was a completely valid and very obvious questions, especially in the context of a multiple choice quiz. But even without that its meaning is obvious - if you have come across the expression previously, i.e. you've read plenty of English at a reasonably high level. So for her it was very hard, for him - well, he just didn't want to rain on her parade by stealing the spotlight.
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Hmm.. he's got a sister who is like that - he might be fully aware of the risk that this is just some kind of tease/prank, but he's strong enough to be willing to take the risk and run with it as if it was a true confession (rather than risking sabotaging himself through anxiety).