Hermione's P.O.V
Hermione was not dumb. She knew that Blond boy 52 was NOT Ron. For one thing Ron had red hair, Ron didn't understand how frustrating it was to have to do other people's homework, Ron would have joined in on how annoying Draco was, and Ron of course couldn't keep a secret.
But she could also tell that whoever Blond Boy was, they wanted Hermione and Ron to be together. So when Ron came back complaining that Malfoy hadn't shown up Hermione asked him on a date.
