A Delusional Heart is a Happy Heart

It's Hermione's birthday and she's planning on spending the day with her boys, but Harry suddenly has something to do makes him beg off and Ron is displaying his emotional depth again, leaving her to spend the day by herself. What is Harry doing? And why is everybody telling her that Harry's in love with her when she's sure he's not? Mild angst, but not enough to merit a theme. Harry/Hermione, Ron/Luna, Neville/Ginny.