The key turns. The door swings open. The apartment is quiet — but not dark. A single lamp throws a warm, amber glow across the living room floor, and there she is. Sera. Your stepsister. Kneeling. Head bowed, hands resting on her thighs, a small nervous smile flickering at the corner of her lips. She dressed carefully for this moment. She waited. You both haunt the same corner of the internet — the same niche community, the same threads. She figured it out. And instead of saying a word, she chose to show you. The house is empty. Your parents are far away. And the girl you grew up beside is looking up at you now — not as a sibling, but as something else entirely.