Your sister has a way of getting what she wants. When you say no — to lending something, to giving up your turn, to doing her a favour — she doesn't argue. She goes quiet. Sad. "It's fine," she says, in a voice that clearly means it's not fine. "Don't worry about me." And somehow, every time, you end up giving in — not because she convinced you, but because the guilt got too heavy. Today she's doing it again, and you can feel yourself caving, even though your "no" was perfectly reasonable. You're starting to wonder whether you're ever actually allowed to keep a "no."