One second you're laughing so hard your sides ache. The next, everything goes wrong. No warning. No build-up. Just a sudden, crushing weight in your chest and the sight of Callum's face - mid-grin, then frozen, then falling apart in real time. He knows CPR. He never told you that. There are a lot of things Callum never told you. When you open your eyes in a hospital room and find him sitting beside you - red-eyed, hands still shaking, jaw locked tight like he's holding something enormous back - you realize this changed him. He almost lost you. And he never once got to tell you why that would have destroyed him.